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Modeling Mercury Transport and Transformation along the Sudbury River, Massachusetts (USA) with Implications for Regulatory Action VOLUME 2: Evaluating the Effectiveness of Different Remedial Alternatives to Reduce Mercury Concentrations in Fish Prepared for: United States Environmental Protection Agency Region I Prepared by: Christopher D. Knightes, Ph.D. United States Environmental Protection Agency Office of Research and Development National Exposure Research Laboratory Ecosystems Research Division Regulatory Support Branch 960 College Station Road Athens, Georgia 30605

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Page 1: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action

VOLUME 2 Evaluating the Effectiveness of Different Remedial Alternatives to Reduce Mercury Concentrations in Fish

Prepared for

United States Environmental Protection Agency Region I

Prepared by Christopher D Knightes PhD United States Environmental Protection Agency Office of Research and Development National Exposure Research Laboratory Ecosystems Research Division Regulatory Support Branch 960 College Station Road Athens Georgia 30605

Abstract

The Sudbury River in eastern Massachusetts USA has elevated levels of total mercury and methylmercury in the sediments surface water and fish The Nyanza Chemical Waste Dump (Nyanza) site located in Ashland Massachusetts has been identified as a significant source of mercury to the downstream river network Moreover elevated mercury concentrations have resulted in hazard indices (HIs) above unity (ie HI gt 10) along portions of the river indicating a potential for risk to human health via the consumption of mercury-contaminated fish For purposes of evaluating mercury exposure risk the Sudbury River was divided into ten reaches representing distinct habitat types flowing reaches impoundments (formed by dams) and wetland reaches The first major impoundment Sudbury River Reservoir 2 (Reach 3 Brackett Reservoir) has the highest concentrations of total mercury in sediment (up to 44 parts per million) followed by Reservoir 1 (Reach 4 Stearns Reservoir) A multi-component differential mass balance mercury-cycling model of the Sudbury River was developed using the Water quality Analysis Simulation Program (WASP 73) to simulate the hydrodynamics the solids transport and mercury transformation and transport processes This model once calibrated was further adapted to evaluate different remedial alternatives to assess how these different approaches might reduce surface water methylmercury concentrations and the associated fish tissue mercury concentrations By using a spatially-resolved model which connects the reservoir system just downstream of the Nyanza site all the way through the Great Meadows National Wildlife Refuge (GMNWR) the model permits evaluation of the effectiveness of different remedial alternatives not only in the reach in which an alternative was implemented but also on successive downstream reaches For example projected mercury concentrations in the Great Meadow Wildlife Refuge can be evaluated when remediation is focused solely on Reservoir 2 (12 miles upstream) Major types of remedial alternatives evaluated include monitored natural recovery (MNR) enhanced natural recovery (ie thin-layer sand placement) in situ capping (using AquaBlokreg a clay- and polymer-based material) and sediment removal via dredging (with and without subsequent capping)

i

TABLE OF CONTENTS

Abstract________________________________________________________________ i

TABLE OF CONTENTS_________________________________________________ ii

TABLES ______________________________________________________________ iii

FIGURES_____________________________________________________________ iv

1 Introduction _______________________________________________________ 1

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model_ 2

21 Alternative 3A Base Case (MNR)____________________________________ 3

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping) ________________________________________________________ 3

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment) _______ 4

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping _____________________________________________ 5

25 Alternative 6 _____________________________________________________ 6

3 Remedial Alternatives Model Output Results _____________________________ 7

4 Discussion_________________________________________________________ 9

41 Remedial Alternatives _____________________________________________ 9

42 Model Uncertainty _______________________________________________ 11

References ___________________________________________________________ 13

ii

TABLES

Table 1 Summary Information for Modeled Reaches

Table 2 Remedial Alternatives Summary

Table 3 Remedial Alternative Implementation corresponding to reach

Table 4 Seasonal variability of boundary concentration conditions for Hg(II) and MeHg

Table 5 Times for dredging for Remedial Alternatives 5A 5B 5C and 5D

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

iii

FIGURES Figure 1 Sudbury River Focus Area

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial

4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

Figure 8 Sudbury River Segmentation for Reach 3

Figure 9 Sudbury River Segmentation for Reach 4

Figure 10 Sudbury River Segmentation for Reach 5

Figure 11 Sudbury River Segmentation for Reach 6

Figure 12 Sudbury River Segmentation for Reach 7

Figure 13 Sudbury River Segmentation for Reach 8

Alternatives 3A 3B and 3C for Reaches 3 4 and 5

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

iv

1 Introduction

This work follows upon previous work which describes the Sudbury River system (from Reservoir 2 in Ashland MA down through the Great Meadows National Wildlife Refuge in Wayland MA) and the transport and transformation of mercury under present conditions (Volume 1 USEPA 2010) The computer modeling effort described in Volume 1 does not consider the effects of any active remedial alternatives rather it describes the present-day conditions and was therefore dubbed the ldquoBase Caserdquo The Water quality Analysis Simulation Program (WASP7 v73 USEPA 2009) was used to develop a modeling framework for the Base Case and different remedial alternatives to simulate mercury concentrations in surface water (hereafter referred to as the ldquoSudbury River modelrdquo ldquoWASPrdquo model or ldquomodelrdquo) In determining the Base Case the WASP Sudbury River model was calibrated to represent the existing conditions of the Sudbury River and how simulated mercury concentrations would project to attenuate over time under natural conditions The completed Base Case allows for the evaluation and comparison of a range of different active remedial alternatives A site-specific Bioaccumulation Factor (BAF) as described in Appendix B of Volume 1 (USEPA 2010) allows for the calculation of projected fish-tissue concentration of mercury based on the simulated dissolved methylmercury water concentrations The model-predicted results from various active remedial alternatives are then compared and evaluated to assess the relative effectiveness of each

For each of the active remedial alternatives a ldquoClean Caserdquo and a ldquoContaminated Caserdquo are simulated in the same way as was done for the Base Case as presented in Volume 1 (2010) For the Clean Case the concentrations of mercury (elemental (Hg(0)) divalent mercury (Hg(II)) and methylmercury (MeHg)) in all water flowing into and through the Sudbury River system are assumed to be a result of the atmospheric deposition and watershed loading of mercury only (ie in the absence of any historical Nyanza mercury) For the Clean Case the initial concentrations1 of mercury are all zero

For the Contaminated Case the initial concentrations correspond to the current conditions as measured presently in the river inclusive of the historic Nyanza-related mercury (ie the Base Case) or adjusted according to the active remedial alternative being evaluated (see Section 2 for further details) For both the Clean and the Contaminated Case the initial concentrations for each of the solids types (silts and fines sands organic matter) are established using the Base Case or adjusted as appropriate for the active remedial alterative being evaluated The initial concentrations for the solids are the same for both the Clean Case and the

1 Initial concentrations are the concentrations of Hg(II) MeHg and Hg(0) in a given medium (sediment water column) at the start of the model before any transport or transformation occurs and before any loads or inflowing concentrations affect the simulation These conditions are before atmospheric deposition and watershed loading influences the system

1

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 2: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Abstract

The Sudbury River in eastern Massachusetts USA has elevated levels of total mercury and methylmercury in the sediments surface water and fish The Nyanza Chemical Waste Dump (Nyanza) site located in Ashland Massachusetts has been identified as a significant source of mercury to the downstream river network Moreover elevated mercury concentrations have resulted in hazard indices (HIs) above unity (ie HI gt 10) along portions of the river indicating a potential for risk to human health via the consumption of mercury-contaminated fish For purposes of evaluating mercury exposure risk the Sudbury River was divided into ten reaches representing distinct habitat types flowing reaches impoundments (formed by dams) and wetland reaches The first major impoundment Sudbury River Reservoir 2 (Reach 3 Brackett Reservoir) has the highest concentrations of total mercury in sediment (up to 44 parts per million) followed by Reservoir 1 (Reach 4 Stearns Reservoir) A multi-component differential mass balance mercury-cycling model of the Sudbury River was developed using the Water quality Analysis Simulation Program (WASP 73) to simulate the hydrodynamics the solids transport and mercury transformation and transport processes This model once calibrated was further adapted to evaluate different remedial alternatives to assess how these different approaches might reduce surface water methylmercury concentrations and the associated fish tissue mercury concentrations By using a spatially-resolved model which connects the reservoir system just downstream of the Nyanza site all the way through the Great Meadows National Wildlife Refuge (GMNWR) the model permits evaluation of the effectiveness of different remedial alternatives not only in the reach in which an alternative was implemented but also on successive downstream reaches For example projected mercury concentrations in the Great Meadow Wildlife Refuge can be evaluated when remediation is focused solely on Reservoir 2 (12 miles upstream) Major types of remedial alternatives evaluated include monitored natural recovery (MNR) enhanced natural recovery (ie thin-layer sand placement) in situ capping (using AquaBlokreg a clay- and polymer-based material) and sediment removal via dredging (with and without subsequent capping)

i

TABLE OF CONTENTS

Abstract________________________________________________________________ i

TABLE OF CONTENTS_________________________________________________ ii

TABLES ______________________________________________________________ iii

FIGURES_____________________________________________________________ iv

1 Introduction _______________________________________________________ 1

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model_ 2

21 Alternative 3A Base Case (MNR)____________________________________ 3

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping) ________________________________________________________ 3

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment) _______ 4

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping _____________________________________________ 5

25 Alternative 6 _____________________________________________________ 6

3 Remedial Alternatives Model Output Results _____________________________ 7

4 Discussion_________________________________________________________ 9

41 Remedial Alternatives _____________________________________________ 9

42 Model Uncertainty _______________________________________________ 11

References ___________________________________________________________ 13

ii

TABLES

Table 1 Summary Information for Modeled Reaches

Table 2 Remedial Alternatives Summary

Table 3 Remedial Alternative Implementation corresponding to reach

Table 4 Seasonal variability of boundary concentration conditions for Hg(II) and MeHg

Table 5 Times for dredging for Remedial Alternatives 5A 5B 5C and 5D

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

iii

FIGURES Figure 1 Sudbury River Focus Area

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial

4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

Figure 8 Sudbury River Segmentation for Reach 3

Figure 9 Sudbury River Segmentation for Reach 4

Figure 10 Sudbury River Segmentation for Reach 5

Figure 11 Sudbury River Segmentation for Reach 6

Figure 12 Sudbury River Segmentation for Reach 7

Figure 13 Sudbury River Segmentation for Reach 8

Alternatives 3A 3B and 3C for Reaches 3 4 and 5

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

iv

1 Introduction

This work follows upon previous work which describes the Sudbury River system (from Reservoir 2 in Ashland MA down through the Great Meadows National Wildlife Refuge in Wayland MA) and the transport and transformation of mercury under present conditions (Volume 1 USEPA 2010) The computer modeling effort described in Volume 1 does not consider the effects of any active remedial alternatives rather it describes the present-day conditions and was therefore dubbed the ldquoBase Caserdquo The Water quality Analysis Simulation Program (WASP7 v73 USEPA 2009) was used to develop a modeling framework for the Base Case and different remedial alternatives to simulate mercury concentrations in surface water (hereafter referred to as the ldquoSudbury River modelrdquo ldquoWASPrdquo model or ldquomodelrdquo) In determining the Base Case the WASP Sudbury River model was calibrated to represent the existing conditions of the Sudbury River and how simulated mercury concentrations would project to attenuate over time under natural conditions The completed Base Case allows for the evaluation and comparison of a range of different active remedial alternatives A site-specific Bioaccumulation Factor (BAF) as described in Appendix B of Volume 1 (USEPA 2010) allows for the calculation of projected fish-tissue concentration of mercury based on the simulated dissolved methylmercury water concentrations The model-predicted results from various active remedial alternatives are then compared and evaluated to assess the relative effectiveness of each

For each of the active remedial alternatives a ldquoClean Caserdquo and a ldquoContaminated Caserdquo are simulated in the same way as was done for the Base Case as presented in Volume 1 (2010) For the Clean Case the concentrations of mercury (elemental (Hg(0)) divalent mercury (Hg(II)) and methylmercury (MeHg)) in all water flowing into and through the Sudbury River system are assumed to be a result of the atmospheric deposition and watershed loading of mercury only (ie in the absence of any historical Nyanza mercury) For the Clean Case the initial concentrations1 of mercury are all zero

For the Contaminated Case the initial concentrations correspond to the current conditions as measured presently in the river inclusive of the historic Nyanza-related mercury (ie the Base Case) or adjusted according to the active remedial alternative being evaluated (see Section 2 for further details) For both the Clean and the Contaminated Case the initial concentrations for each of the solids types (silts and fines sands organic matter) are established using the Base Case or adjusted as appropriate for the active remedial alterative being evaluated The initial concentrations for the solids are the same for both the Clean Case and the

1 Initial concentrations are the concentrations of Hg(II) MeHg and Hg(0) in a given medium (sediment water column) at the start of the model before any transport or transformation occurs and before any loads or inflowing concentrations affect the simulation These conditions are before atmospheric deposition and watershed loading influences the system

1

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 3: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

TABLE OF CONTENTS

Abstract________________________________________________________________ i

TABLE OF CONTENTS_________________________________________________ ii

TABLES ______________________________________________________________ iii

FIGURES_____________________________________________________________ iv

1 Introduction _______________________________________________________ 1

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model_ 2

21 Alternative 3A Base Case (MNR)____________________________________ 3

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping) ________________________________________________________ 3

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment) _______ 4

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping _____________________________________________ 5

25 Alternative 6 _____________________________________________________ 6

3 Remedial Alternatives Model Output Results _____________________________ 7

4 Discussion_________________________________________________________ 9

41 Remedial Alternatives _____________________________________________ 9

42 Model Uncertainty _______________________________________________ 11

References ___________________________________________________________ 13

ii

TABLES

Table 1 Summary Information for Modeled Reaches

Table 2 Remedial Alternatives Summary

Table 3 Remedial Alternative Implementation corresponding to reach

Table 4 Seasonal variability of boundary concentration conditions for Hg(II) and MeHg

Table 5 Times for dredging for Remedial Alternatives 5A 5B 5C and 5D

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

iii

FIGURES Figure 1 Sudbury River Focus Area

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial

4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

Figure 8 Sudbury River Segmentation for Reach 3

Figure 9 Sudbury River Segmentation for Reach 4

Figure 10 Sudbury River Segmentation for Reach 5

Figure 11 Sudbury River Segmentation for Reach 6

Figure 12 Sudbury River Segmentation for Reach 7

Figure 13 Sudbury River Segmentation for Reach 8

Alternatives 3A 3B and 3C for Reaches 3 4 and 5

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

iv

1 Introduction

This work follows upon previous work which describes the Sudbury River system (from Reservoir 2 in Ashland MA down through the Great Meadows National Wildlife Refuge in Wayland MA) and the transport and transformation of mercury under present conditions (Volume 1 USEPA 2010) The computer modeling effort described in Volume 1 does not consider the effects of any active remedial alternatives rather it describes the present-day conditions and was therefore dubbed the ldquoBase Caserdquo The Water quality Analysis Simulation Program (WASP7 v73 USEPA 2009) was used to develop a modeling framework for the Base Case and different remedial alternatives to simulate mercury concentrations in surface water (hereafter referred to as the ldquoSudbury River modelrdquo ldquoWASPrdquo model or ldquomodelrdquo) In determining the Base Case the WASP Sudbury River model was calibrated to represent the existing conditions of the Sudbury River and how simulated mercury concentrations would project to attenuate over time under natural conditions The completed Base Case allows for the evaluation and comparison of a range of different active remedial alternatives A site-specific Bioaccumulation Factor (BAF) as described in Appendix B of Volume 1 (USEPA 2010) allows for the calculation of projected fish-tissue concentration of mercury based on the simulated dissolved methylmercury water concentrations The model-predicted results from various active remedial alternatives are then compared and evaluated to assess the relative effectiveness of each

For each of the active remedial alternatives a ldquoClean Caserdquo and a ldquoContaminated Caserdquo are simulated in the same way as was done for the Base Case as presented in Volume 1 (2010) For the Clean Case the concentrations of mercury (elemental (Hg(0)) divalent mercury (Hg(II)) and methylmercury (MeHg)) in all water flowing into and through the Sudbury River system are assumed to be a result of the atmospheric deposition and watershed loading of mercury only (ie in the absence of any historical Nyanza mercury) For the Clean Case the initial concentrations1 of mercury are all zero

For the Contaminated Case the initial concentrations correspond to the current conditions as measured presently in the river inclusive of the historic Nyanza-related mercury (ie the Base Case) or adjusted according to the active remedial alternative being evaluated (see Section 2 for further details) For both the Clean and the Contaminated Case the initial concentrations for each of the solids types (silts and fines sands organic matter) are established using the Base Case or adjusted as appropriate for the active remedial alterative being evaluated The initial concentrations for the solids are the same for both the Clean Case and the

1 Initial concentrations are the concentrations of Hg(II) MeHg and Hg(0) in a given medium (sediment water column) at the start of the model before any transport or transformation occurs and before any loads or inflowing concentrations affect the simulation These conditions are before atmospheric deposition and watershed loading influences the system

1

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 4: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

TABLES

Table 1 Summary Information for Modeled Reaches

Table 2 Remedial Alternatives Summary

Table 3 Remedial Alternative Implementation corresponding to reach

Table 4 Seasonal variability of boundary concentration conditions for Hg(II) and MeHg

Table 5 Times for dredging for Remedial Alternatives 5A 5B 5C and 5D

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

iii

FIGURES Figure 1 Sudbury River Focus Area

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial

4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

Figure 8 Sudbury River Segmentation for Reach 3

Figure 9 Sudbury River Segmentation for Reach 4

Figure 10 Sudbury River Segmentation for Reach 5

Figure 11 Sudbury River Segmentation for Reach 6

Figure 12 Sudbury River Segmentation for Reach 7

Figure 13 Sudbury River Segmentation for Reach 8

Alternatives 3A 3B and 3C for Reaches 3 4 and 5

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

iv

1 Introduction

This work follows upon previous work which describes the Sudbury River system (from Reservoir 2 in Ashland MA down through the Great Meadows National Wildlife Refuge in Wayland MA) and the transport and transformation of mercury under present conditions (Volume 1 USEPA 2010) The computer modeling effort described in Volume 1 does not consider the effects of any active remedial alternatives rather it describes the present-day conditions and was therefore dubbed the ldquoBase Caserdquo The Water quality Analysis Simulation Program (WASP7 v73 USEPA 2009) was used to develop a modeling framework for the Base Case and different remedial alternatives to simulate mercury concentrations in surface water (hereafter referred to as the ldquoSudbury River modelrdquo ldquoWASPrdquo model or ldquomodelrdquo) In determining the Base Case the WASP Sudbury River model was calibrated to represent the existing conditions of the Sudbury River and how simulated mercury concentrations would project to attenuate over time under natural conditions The completed Base Case allows for the evaluation and comparison of a range of different active remedial alternatives A site-specific Bioaccumulation Factor (BAF) as described in Appendix B of Volume 1 (USEPA 2010) allows for the calculation of projected fish-tissue concentration of mercury based on the simulated dissolved methylmercury water concentrations The model-predicted results from various active remedial alternatives are then compared and evaluated to assess the relative effectiveness of each

For each of the active remedial alternatives a ldquoClean Caserdquo and a ldquoContaminated Caserdquo are simulated in the same way as was done for the Base Case as presented in Volume 1 (2010) For the Clean Case the concentrations of mercury (elemental (Hg(0)) divalent mercury (Hg(II)) and methylmercury (MeHg)) in all water flowing into and through the Sudbury River system are assumed to be a result of the atmospheric deposition and watershed loading of mercury only (ie in the absence of any historical Nyanza mercury) For the Clean Case the initial concentrations1 of mercury are all zero

For the Contaminated Case the initial concentrations correspond to the current conditions as measured presently in the river inclusive of the historic Nyanza-related mercury (ie the Base Case) or adjusted according to the active remedial alternative being evaluated (see Section 2 for further details) For both the Clean and the Contaminated Case the initial concentrations for each of the solids types (silts and fines sands organic matter) are established using the Base Case or adjusted as appropriate for the active remedial alterative being evaluated The initial concentrations for the solids are the same for both the Clean Case and the

1 Initial concentrations are the concentrations of Hg(II) MeHg and Hg(0) in a given medium (sediment water column) at the start of the model before any transport or transformation occurs and before any loads or inflowing concentrations affect the simulation These conditions are before atmospheric deposition and watershed loading influences the system

1

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
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Page 5: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

FIGURES Figure 1 Sudbury River Focus Area

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial

4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

Figure 8 Sudbury River Segmentation for Reach 3

Figure 9 Sudbury River Segmentation for Reach 4

Figure 10 Sudbury River Segmentation for Reach 5

Figure 11 Sudbury River Segmentation for Reach 6

Figure 12 Sudbury River Segmentation for Reach 7

Figure 13 Sudbury River Segmentation for Reach 8

Alternatives 3A 3B and 3C for Reaches 3 4 and 5

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

iv

1 Introduction

This work follows upon previous work which describes the Sudbury River system (from Reservoir 2 in Ashland MA down through the Great Meadows National Wildlife Refuge in Wayland MA) and the transport and transformation of mercury under present conditions (Volume 1 USEPA 2010) The computer modeling effort described in Volume 1 does not consider the effects of any active remedial alternatives rather it describes the present-day conditions and was therefore dubbed the ldquoBase Caserdquo The Water quality Analysis Simulation Program (WASP7 v73 USEPA 2009) was used to develop a modeling framework for the Base Case and different remedial alternatives to simulate mercury concentrations in surface water (hereafter referred to as the ldquoSudbury River modelrdquo ldquoWASPrdquo model or ldquomodelrdquo) In determining the Base Case the WASP Sudbury River model was calibrated to represent the existing conditions of the Sudbury River and how simulated mercury concentrations would project to attenuate over time under natural conditions The completed Base Case allows for the evaluation and comparison of a range of different active remedial alternatives A site-specific Bioaccumulation Factor (BAF) as described in Appendix B of Volume 1 (USEPA 2010) allows for the calculation of projected fish-tissue concentration of mercury based on the simulated dissolved methylmercury water concentrations The model-predicted results from various active remedial alternatives are then compared and evaluated to assess the relative effectiveness of each

For each of the active remedial alternatives a ldquoClean Caserdquo and a ldquoContaminated Caserdquo are simulated in the same way as was done for the Base Case as presented in Volume 1 (2010) For the Clean Case the concentrations of mercury (elemental (Hg(0)) divalent mercury (Hg(II)) and methylmercury (MeHg)) in all water flowing into and through the Sudbury River system are assumed to be a result of the atmospheric deposition and watershed loading of mercury only (ie in the absence of any historical Nyanza mercury) For the Clean Case the initial concentrations1 of mercury are all zero

For the Contaminated Case the initial concentrations correspond to the current conditions as measured presently in the river inclusive of the historic Nyanza-related mercury (ie the Base Case) or adjusted according to the active remedial alternative being evaluated (see Section 2 for further details) For both the Clean and the Contaminated Case the initial concentrations for each of the solids types (silts and fines sands organic matter) are established using the Base Case or adjusted as appropriate for the active remedial alterative being evaluated The initial concentrations for the solids are the same for both the Clean Case and the

1 Initial concentrations are the concentrations of Hg(II) MeHg and Hg(0) in a given medium (sediment water column) at the start of the model before any transport or transformation occurs and before any loads or inflowing concentrations affect the simulation These conditions are before atmospheric deposition and watershed loading influences the system

1

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 6: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

1 Introduction

This work follows upon previous work which describes the Sudbury River system (from Reservoir 2 in Ashland MA down through the Great Meadows National Wildlife Refuge in Wayland MA) and the transport and transformation of mercury under present conditions (Volume 1 USEPA 2010) The computer modeling effort described in Volume 1 does not consider the effects of any active remedial alternatives rather it describes the present-day conditions and was therefore dubbed the ldquoBase Caserdquo The Water quality Analysis Simulation Program (WASP7 v73 USEPA 2009) was used to develop a modeling framework for the Base Case and different remedial alternatives to simulate mercury concentrations in surface water (hereafter referred to as the ldquoSudbury River modelrdquo ldquoWASPrdquo model or ldquomodelrdquo) In determining the Base Case the WASP Sudbury River model was calibrated to represent the existing conditions of the Sudbury River and how simulated mercury concentrations would project to attenuate over time under natural conditions The completed Base Case allows for the evaluation and comparison of a range of different active remedial alternatives A site-specific Bioaccumulation Factor (BAF) as described in Appendix B of Volume 1 (USEPA 2010) allows for the calculation of projected fish-tissue concentration of mercury based on the simulated dissolved methylmercury water concentrations The model-predicted results from various active remedial alternatives are then compared and evaluated to assess the relative effectiveness of each

For each of the active remedial alternatives a ldquoClean Caserdquo and a ldquoContaminated Caserdquo are simulated in the same way as was done for the Base Case as presented in Volume 1 (2010) For the Clean Case the concentrations of mercury (elemental (Hg(0)) divalent mercury (Hg(II)) and methylmercury (MeHg)) in all water flowing into and through the Sudbury River system are assumed to be a result of the atmospheric deposition and watershed loading of mercury only (ie in the absence of any historical Nyanza mercury) For the Clean Case the initial concentrations1 of mercury are all zero

For the Contaminated Case the initial concentrations correspond to the current conditions as measured presently in the river inclusive of the historic Nyanza-related mercury (ie the Base Case) or adjusted according to the active remedial alternative being evaluated (see Section 2 for further details) For both the Clean and the Contaminated Case the initial concentrations for each of the solids types (silts and fines sands organic matter) are established using the Base Case or adjusted as appropriate for the active remedial alterative being evaluated The initial concentrations for the solids are the same for both the Clean Case and the

1 Initial concentrations are the concentrations of Hg(II) MeHg and Hg(0) in a given medium (sediment water column) at the start of the model before any transport or transformation occurs and before any loads or inflowing concentrations affect the simulation These conditions are before atmospheric deposition and watershed loading influences the system

1

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 7: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Contaminated Case since each scenario is subjected to these changes in the structure of the solids concentrations

Active remedial alternatives were evaluated along portions of the Sudbury River where there was a potential risk due to the ingestion of mercury-contaminated fish (as indicated by a HI gt 10) Moreover within these reaches total mercury sediment concentrations were also used to differentiate between remedial scenarios (ie above 2 and 10 ppm respectively) Mercury concentrations in sediments along with the HI for the recreational child angler are presented in Table 1 A variety of different remedial alternatives were developed and are listed in Table 2 By combining the information in Table 1 with the construct of Table 2 Table 3 presents the full set of remedial alternatives evaluated in this modeling effort

It should also be noted that the results presented in this Volume are further described and have been incorporated into the Nyanza Chemical Site (OU4 ndash Sudbury River) Draft Feasibility Study (FS) being prepared by Nobis Engineering Inc The FS quantifies the total estimated cost and benefits associated with each of the active remedial alternatives and assesses the ability of each alternative to attain Preliminary Remedial Goals (PRGs) In addition the FS includes a discussion of elevated background mercury concentrations (a well-documented trend in the northeast and elsewhere) and how this affects decision-making for the Nyanza site Finally the FS examines additional facets relative to the implementation of any active remedial alternative such as site access engineering controls and migration of resuspended sediments which typically occurs during sediment dredging (for further details see the Feasibility Study)

Section 2 describes each of the active remedial alternatives in more detail Here the model parameterization and the assumptions necessary are discussed and the changes in the Base Case model are described

Section 3 presents the outputs for each of the modeled alternatives and presents a discussion of the results with implications to be considered when making remedial decisions

2 Implementation of Remedial Alternatives into the Sudbury River WASP Model

The computer model as described in Volume 1 describes the Base Case to which other active remedial alternatives can be compared For reference in this document (and to dovetail with nomenclature used in the Nyanza FS) the Base Case is referred to as Alternative 3A or Monitored Natural Recovery (MNR) as it assumes no active remediation is implemented Again each alternative case has a Clean Case and a Contaminated Case For the Clean Case the initial concentrations for all species of mercury are artificially set to zero and boundary conditions are based on those measured currently in the riverwatershed (these are detailed in Volume 1 and

2

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 8: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

presented again here in Table 4) The solids concentrations are the same for the Clean and Contaminated Case and are also based on those measured currently in the riverwatershed For the evaluation of remedial alternatives the initial concentration of mercury (all species) in the Contaminated Case or the composition of bottom sediment (eg percent solids) varies according to the remedial alternative being evaluated The initial conditions for each of the alternatives are provided in the Appendix

To fully capture the dynamics of the Sudbury River hydrology solids balance and mercury cycling processes the Sudbury River was segmented into a finer resolution Accordingly the WASP model for the Sudbury River was constructed by dividing the Sudbury River study area into 33 discrete ldquosegmentsrdquo as shown in Figure 1 Each segment represents a section of the Sudbury River with a surface water layer and multiple underlying sediment layers The Sudbury River WASP model consists of a total 118 segments Segments 1 ndash 33 are surface water segments starting with segment 1 at the start of the Reservoir 2 traveling downstream to segment 33 at the end of the GMNWR Underlying these surface water segments are multiple sediment layer segments which generally increase in number going downstream For most of the River (all regions downstream of Reservoir 1) there are two sediment layers a surface benthic layer and a thicker deeper subsurface benthic layer In modelling the Reservoirs there are four sediment layers For the final segment of Reservoir 2 (segment 5)there is an additional surface water segment below the last 300m this was added to represent the deeper water which is located just upstream of the dam All surface water and sediment WASP segments are presented in Tables A-1 and A-2 (included in the appendix) A graphical representation of each reach is provided Figures 2 through 7 and a GIS representation is given in Figures 8 through 13

21 Alternative 3A Base Case (MNR)

Alternative 3A is the Base Case for which all other alternatives are compared These modeling results were the final results developed and reported in Volume 1 The simulation was run for 32 years to demonstrate how the system changes over a period of time The result of Alternative 3A were calculated in the absence of any active remediation and hence are representative of any natural recovery that might occur The initial conditions for Alternative 3A are presented in the Appendix Table A-1

22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)

Alternatives 3B and 3C incorporate the placement of a 6rdquo (10 cm) layer of sand Thin-layer sand capping normally accelerates natural recovery thorough several processes including increased dilution through bioturbation of clean sediment with underling contaminants (USEPA 2005) For Alternative 3B sand is placed where HgT concentrations uniformly exceed 10 mgkg in surface sediment this includes only the final section of Reservoir 2 (Reach 3) and corresponds to WASP surface

3

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 9: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

water segments 5 For Alternative 3C sand is placed over sediment where HgT concentrations exceed 2 mgkg in surface sediment this includes Sudbury River Reaches 3 4 and 6 which correspond to WASP surface water segments 1 ndash 5 6 - 7 and 15 ndash 17 In these sections of the Sudbury River the underlying sediment segments were initialized as having characteristics of sand porosity of 042 density of 155x106 gm3 (Juma 1999) The partition coefficient matches that used in Volume 1 for sand (1000 Lkg for Hg(II) and 100 Lkg for MeHg) Initial concentrations of solids in these sediment segments were changed to 0 mgL silts and fines 1550550 mgL sands and 0 mgL organic matter for these segments For Alternative 3B the sediment segments that were characterized as sand were 34 ndash 38 and 101 (Reach 3) For Alternative 3C the sediment segments were 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) Introducing the layer of sand results in having all previous sediment segments being pushed down to a deeper layer so the characteristic of the new layer is what was previously a layer above it This can be best illustrated by looking at Figure 8 showing the segmentation for Reach 3 For water segment 4 segment 37 is given the characteristics of pure sand Segment 70 is defined using the characteristics of sediment segment 37 from the Base Case Segment 108 is defined as sediment segment 70 in the Base Case and Segment 115 is defined using the sediment segment 108 from the Base Case The characteristics for the Base case 115 are no longer incorporated into the model as it is now pushed out of the model domain The initial conditions are presented in the Appendix Table A-2

23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)

Remedial alternatives 4A and 4B both incorporate in situ containment using AquaBlokreg for reaches where mean total mercury concentrations exceed 2 mgkg AquaBlokreg is a patented composite particle technology used as a low permeability barrier for environmental remediation of contaminated sediments AquaBlok reg is a material comprised of a combination of bentonite clay with polymer additives covering a small aggregate core (AquaBlok Ltd Toledo OH) AquaBlokreg has the following physical characteristic which were used in the WASP model for the evaluation of these alternatives porosity of 062 and density of 128 x 106 gm3

(AquaBlokreg 2009) Alternative 4A focuses solely on Reservoir 2 (Reach 3) which corresponds to model surface water segments 1 ndash 5 Alternative 4B targets Reaches 3 4 and 6 which correspond to model surface water segments 1 ndash 5 6 - 7 and 15 ndash 17) As was discussed in Section 22 for sand capping the sediment layers associated with these surface water segments that were characterized as AquaBlokreg were 34 ndash 38 and 101 for Alternative 4A and 34 ndash 38 and 101 (Reach 3) 39 ndash 40 (Reach 4) and 48 ndash 50 (Reach 6) for Alternative 4B Due to limitations of the WASP model (as presently constructed) the AquaBlokreg capping material was modeled to have the same physical properties as organic matter (partition coefficient to silt 4 x 105 Lkg for Hg(II) and 5 x 105 Lkg for MeHg) and was assumed to not resuspend Uncertainty introduced from this simplification is discussed in Section 42 of this report In these segments the other solids sands and silts were modeled as before

4

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 10: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

and resuspend and settle as in other segments Organic material is modeled with settling and resuspension as before in all segments where AquaBlokreg was not introduced

For the sediment layers to which AquaBlokreg is added the sediment layers below the AquaBlokreg addition are characterized by the segment characteristics that were previously surface segments For example for WASP model river water column segments 1 ndash 5 the underlying sediment surface layer segments 34 ndash 38 are characterized with AquaBlokreg physical parameterization and the underlying segments 67 ndash 71 are characterized as Alternative 3Arsquos segments 34 ndash 38 and segments 105 ndash 109 are characterized as Alternative 3Arsquos 67 ndash 71 The initial conditions for Alternative 4A and 4B are provided in the Appendix Tables A-3 and A-4 respectively

24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping

The set of Alternatives 5A 5B 5C and 5D evaluate the effect of dredging different reaches of the Sudbury River Unlike in other capping alternatives where a new sediment layer is added on top of the existing sediments in these dredging alternatives sediments are removed from the system revealing the deeper underlying segments The WASP model structure for Alternative 3A (Base Case) contains sediment layers down to 20 cm so for alternatives where more than 20 cm is removed all the sediment segment layers underlying a surface water segment from Alternative 3A are removed and replaced with the characteristics of the sediment layers that would be beneath these segments For the Clean Cases as was done previously the initial concentrations of all mercury species is assumed to be zero For the Contaminated Cases the initial conditions for residual mercury which is below 20 cm (post dredging) are modeled as 1 mgkg Hg(II) and 1 ugkg MeHg for all segments except the sediment layers beneath segments 1 6 and 7 where Hg(II) is 3 mgkg and MeHg is 2 ugkg (Frazier et al 2000) For both the Clean and Contaminated Cases the solids concentrations (ie silts sands organic matter) are assumed to be identical to the deepest modeled sediment segment from the Base Case Alternative 3A and are used for all sediment segments underneath that segment

Remedial Alternative 5A consists of dredging mercury-contaminated sediments where the concentration of total mercury is greater than 10 mgkg in any sample interval (ie the majority of Reach 3) This corresponds to WASP model segments 2 ndash 5 A 20 cm dredging depth is implemented

Remedial Alternative 5B consists of dredging in Reservoir 2 where total mercury exceeds 10 mgkg in any sample interval (Segments 2 ndash 5) and placement of 6 inches (10cm) of AquaBlokreg capping in Reach 3 (post dredging) and in Reach 4 and 6

5

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 11: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

where total mercury exceeds 2 mgkg this corresponds to model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 Depth of dredging is 20 cm

Remedial Alternative 5C consists of dredging in Reservoir 2 where total mercury exceeds 2 mgkg this corresponds to WASP model segments 1 ndash 5 The depth of dredging in this alternative is 30 cm The difference between Alternative 5A and 5C is that segment 1 is included and the depth is increased from 20 cm to 30 cm

Remedial Alternative 5D consist of dredging where the total mercury concentration in the sediments exceeds 2 mgkg with no capping This consists of Reaches 3 4 and 6 which are WASP model segments 1 ndash 5 6 ndash 7 and 15 ndash 17 The depth of dredging for this scenario is 30 cm for Reaches 3 and 6 and 40 cm for Reach 4

Dredging frequently results in the release of up to 5 of sediment back to the overlying water column (Tornado Motion Technologies 2009) The Sudbury River dredging alternatives were simulated by removing all sediments and assuming that a portion (5) is released back into the overlying water column over the period of time it takes for the dredging to occur For each of the alternatives a different time frame is anticipated depending on the size and complexity of the area to be dredged These estimated times are presented in Table 5

Using the sediment layer composition from the Base Case (ie percent solids and Hg concentrations) the total mass of each solid (sands silts organic matter) and associated mass of mercury (Hg(II) and MeHg) were calculated From these values 5 of the total mass was divided equally over the estimated time frame to conduct dredging (Table 5) This load of solids (masstime) were added to the overlying WASP water column segment over the appropriate time scale which corresponds to the length of time that it takes to dredge the sediments (see Table 5)

The initial concentrations for Alternatives 5A 5B 5C and 5D are provided in the Appendix Tables A-5 A-6 A-7 and A-8 respectively The loadings into the water column are provided in the Appendix Tables A-9 A-10 and A-11

25 Alternative 6

Remedial Alternative 6 evaluates the effectiveness of active remediation within the Great Meadows National Wildlife Refuge (GMNWR - Reach 8) Everything upstream of Reach 8 is the same as the Base Case Alternative 3A Alternative 6 consists of dredging the floodplain portion of Reach 8 (1152 acres) to a depth of 25 cm This conservative approach was based on limited data from the main channel as well as samples collected from the floodplains These data reveal that most of the surface sediment within GMNWR are between 1 and 3 mgkg with a slight increasing trend with depth (TechLaw 2009) Reach 8 corresponds to WASP model water column segments 25 ndash 33 and sediment layers 58 ndash 66 and 91 - 99 Similar to Section 24 the characteristics of the resulting sediment layers are characterized using the concentrations measured in the historic cores collected by Frazier et al (2000) The

6

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 12: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Hg concentrations of the sediment segments remaining and modeled in Alternative 6 are 3 ugkg for Hg(II) and 09 ugkg for MeHg for the top 5 cm 1 ugkg for Hg(II) and 07 ugkg for MeHg for the next 5cm The sediment solids concentrations are modeled as being identical to the solids concentrations of the deepest sediment layer (ie sediment layers 58 ndash 66 have the same solid concentrations as 91 ndash 99 91 ndash 99 have the same solids concentrations as before because these are the deepest modeled sediment layers) The initial conditions for the sediments are presented in the Appendix in Table A-11 This dredging alternative is assumed to not release sediments back to the water column as it was assumed this would be implemented under dry conditions

3 Remedial Alternatives Model Output Results

The dissolved MeHg surface water concentrations were simulated for each alternative for a 32-year time period with each alternative including a Clean Case and a Contaminated Case scenario The results of the two cases were summed to provide the combined case representing projected mercury concentrations in the Sudbury River system due to atmospheric loading and historical loading from the Nyanza Site A previous national study by Brumbaugh et al (2001) suggested that MeHg in water has a strong correlation (correlation of log (MeHg in water) to log(Hg in fishlength) = 0712 for largemouth bass plt0001) to fish tissue concentrations Accordingly the output of the model was converted from dissolved surface water MeHg to projected fish tissue concentration using a site-specific bioaccumulation factor (BAF) Because the WASP model segmentation of the Sudbury River is more refined than the Sudbury River ldquoReachrdquo delineations the MeHg concentrations for all WASP segments within a reach were averaged into a single annual mean for the entire reach The fish tissue concentration was calculated using a BAF of 78x106 Lkg (see Volume 1 Appendix) The fish were assumed to represent a 3-year-old fish so the annual mean concentration from year 1 was assumed to translate to the fish tissue concentration of 3 years later (ie year 4) The hydrologic flow of the Sudbury River was measured over a 2-year period and assumed to repeat for the duration of the model The model-predicted annual fish tissue concentration was then further averaged into a single fish tissue Hg concentration (ie year 4 and 5 were averaged resulting in a concentration at time = 45 yrs) The results are plotted in Figures 14 through 22 The raw data is provided in the Appendix The results for each reach are discussed below Because Alternative 6 only impacts Reach 8 it is only discussed in the context of that reach and is only presented in Figure 22

The projected fish tissue concentrations are grouped by remediation alternative and presented in Figures 13 - 18 All alternatives and reaches are presented in Figures 19shy21 for Reaches 3 4 and 8 Figures 13 presents Alternatives 3A 3B and 3C for Reaches 3 ndash 5 and Figure 14 presents Alternatives 3A 3Band 3C for Reaches 6 ndash 8 Figures 15 presents Alternatives 3A 4A and 4B for Reaches 3 ndash 5 and Figure 16 presents Alternatives 3A 4A and 4B for Reaches 6 ndash 8 Figure 17 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 3 ndash 5 and Figure 18 presents Alternatives 3A 5A 5B 5C and 5D for Reaches 6 ndash 8 All figures are presented on

7

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 13: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

the same scale of 0 to 1 mg Hgkg fish tissue The Preliminary Remedial Goal (PRG) of 048 mgkg in fish tissue is presented on all figures as a point of reference The alternatives of the same number are plotted in the same color on all figures Figure 19 presents all alternatives for Reach 3 Figure 20 presents all alternatives for Reach 4 and Figure 21 presents all alternatives for Reach 8

For Reach 3 all active remedial alternatives are improvements over the Base Case (Alternative 3A) demonstrating that all of these alternatives will reduce the fish tissue concentrations to below the PRG within the duration of the model simulation (32 years) Alternative 3A MNR shows just under a 10 decrease in fish tissue concentration over the simulation and is just approaching the PRG Alternative 3B provides a reduction of 15 with a fish tissue concentration of 047 mgkg Alternatives 3C 4A 4B and 5B have the greatest reductions in fish tissue Hg concentrations and result in final fish tissue Hg concentrations of approximately 043 mgkg with a reduction of 22 Alternatives 5A 5C and 5D provide approximately a 20 reduction with fish tissue concentrations of approximately 045 mgkg which slightly higher than Alternatives 3B 3C 4A 4B and 5B

For Reach 4 all active remedial alternatives are improvements over the Base Case (Alternative 3A) All of the alternatives result in projected fish tissue concentrations below the PRG Alternative 3A results in slight reduction of fish tissue Hg over the length of the run Alternatives 3B to 5D all reduce the projected fish tissue concentrations immediately after the alternative is implemented Alternative 3C 4B and 5B provide the largest reduction lowering fish tissue Hg concentrations to approximately 015 mgkg corresponding to approximately a 45 reduction Alternative 3B 5A 5C and 5D reduce fish tissue Hg concentrations to approximately 019 mgkg for approximately a 30 reduction

Reaches 5 6 and 7 exhibit similar results All Alternatives including Base Case (Alternative 3A) are immediately below the PRG

For Reach 8 most of the alternatives result in an only a modest improvement in the projected fish tissue Hg concentration and none of the alternatives result in fish tissue concentrations below the PRG in the time frame evaluated Alternative 5B and 5D result in fish tissue Hg concentrations higher than the Base Case (Alternative 3A) most likely due to sediment resuspension Alternative 5B has initial fish concentrations below Alternative 5D and has a steeper slope as it decreases over time Since the simulation was stopped by year 35 it is unclear the long term shape of the curve for both 5B and 5D It seems that past 35 years Alternative 5B may continue to decrease to below the Base Case (Alternative 3A) while Alternative 5D may take much longer The most significant reduction within a reasonable period of time (ie less than 35 years) for Reach 8 is Alternative 6 which evaluates the dredging of gt1000 acres of wetlands however this reduction only marginally outperforms natural recovery (Alternative 3A) The final projected fish tissue concentration for reach 8 under MNR is 057 mgkg after 5 yrs and 056 mgkg after

8

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

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t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 14: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

30 yrs where as dredging (alternative 6) resulting in 051 mgkg after 5 yrs and 048 mgkg after 30 yrs

4 Discussion

41 Remedial Alternatives

For Reaches 3 through 7 Remedial Alternatives 3A through 5D all project a reduction in fish tissue Hg concentrations to varying degrees over time In general (excluding Reach 8) Alternative 3A (the Monitored Natural RecoveryBase Case) depicts a slow decrease in fish tissue Hg concentrations throughout the length of the analysis suggesting that the influence of the historic Nyanza site mercury continues to slowly decrease over time However for the duration of the model simulation MNR does not project a reduction in fish tissue Hg concentrations to below the PRG in Reaches 3 or 8 and is already below the PRG in some of the other reaches

Alternatives 3B and 4A involve capping within Reach 3 (Reservoir 2) which could result in Reach 4 and 6 (where elevated Hg concentrations in sediment are present) continuing to be secondary sources of mercury to downstream reaches The simulated results demonstrate that Alternative 4A is similar to Alternative 3B and 4B in Reach 3 For these alternatives the fish tissue Hg concentration is lower in Reach 4 than Alternative 3A suggesting that the upstream impact of Reach 3 on Reach 4 has been reduced or removed when capping of Reach 3 is implemented resulting in lower fish tissue Hg concentrations but fish tissue Hg concentrations are not as low in Reach 4 as when Alternative 3C is implemented and Reach 4 itself is capped The comparison of 4A to 4B helps identify the influence of Reach 3 on downstream reaches Because no simulations were performed capping only Reach 4 or Reach 6 the distinction between capping these with or without Reach 3 cannot be specifically addressed

The largest reduction in fish tissue Hg concentration for all reaches is achieved via Alternatives 3C and 4B (these being the more comprehensive capping alternatives) Both Alternative 3C (thin layer sand placement) and 4B (AquaBlokreg) contemplate capping of Reaches 3 4 and 6 The model simulation results suggest that by capping the highest areas of elevated mercury in sediment the fish tissue Hg concentrations in downstream reaches will be reduced Despite the reduction the model simulations results suggest that elevated fish tissue Hg concentrations will still persist in Reach 8 (GMNWR) Additional rationale and discussion of this result is provided below

The dredging scenario (Alternatives 5A through 5D) simulation provides some insight into the impact of dredging and how the location of dredging affects not only the reach where the dredging is implemented but also downstream reaches For example in Reach 3 and 4 Alternatives 5A 5C and 5D predict similar fish tissue Hg concentrations These alternatives all include dredging of Reach 3 and therefore have similar results in Reach 3 However after Reach 3 Alternatives 5A and 5C are

9

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 15: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

effectively identical showing the impact of removing the Reach 3 mercury on lowering downstream concentrations Because Reach 3 is effectively a large settling basin it seems that the resuspension of dredge material does not travel appreciably downstream from the reservoir rather it seems the majority of resuspended solids (and mercury) would return to the sediment layer within Reach 3 Therefore based on the model-predicted results it is not hypothesized that limited dredging significantly upstream (ie in the Reservoirs) would result in a noticeable contribution of mercury to downstream reaches such as the GMNWR

There is no alternative that was run with just dredging Reach 3 and 4 without dredging Reach 6 so the results have to be investigated together In Reach 3 the impacts of Alternative 5D sediment removal from Reach 3 and Reach 4 results in a slightly higher initial fish tissue Hg concentration than Alternatives 5A and 5C which decreases relatively quickly and then the predicted line merges with the model predicted concentrations of Alternatives 5A and 5C Farther downstream past the reservoir system (Reaches 3 and 4) the impact of the release of the dredge material from Reach 6 becomes more pronounced Alternative 5B and 5D have higher initial fish tissue Hg concentration which continue for the early years of the simulation and then decrease over time The high concentrations from Alternative 5B result from the combination of sediment removal and capping For Alternative 5D the removal from Reaches 3 4 and 6 over an appreciably longer time frame than the other sediment removal processes result in a long-term source of resuspended mercury and solids that travel downstream The increased Hg(II) concentrations methylated as they travel along the length of the Sudbury River and upon reaching the high methylation rates in the GMNWR result in higher MeHg concentrations and the associated higher fish tissue Hg concentrations

In Reach 8 the effect of the released dredged material on downstream reaches becomes clearer Alternative 5D removes sediment from Reaches 3 4 and 6 and simulations predict decreases in fish tissue Hg concentrations in upstream reaches but results in the highest fish tissue Hg concentrations in Reach 8 Alternative 5B is just below Alternative 5D with a much steeper slope than Alternative 5D resulting in a faster approach to the PRG For Alternative 5D MeHg and HgT concentrations remain high suggesting that the system responds slowly to the extent of dredging in this alternative The disturbance of the surface sediment layer in three Reaches (possibly dominantly from Reach 6) results in releasing a large amount of solids and mercury to transport downstream The solids and mercury settle to the surface of the sediment layer and results in a new particle size distribution which seems to impact the cycling of mercury within the system The system does not return to Base Case conditions during the model simulation of Alternative 5D or 5B Reach 8 effectively acts as a settling location for incoming mercury and solids however the shallow depth results in a constant stirring up and depositing of mercury and solids as they traverse the GMNWR Because wetlands and wettingdrying zones in the environment have been associated with increased methylation potential the GMNWR has increased potential methylation compared to the rest of the Sudbury River system As mercury reaches the GMNWR there is appreciable time for Hg(II) to methylated

10

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 16: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

to MeHg and the thin layer of water allows active interaction (settling resuspension dispersion) with the underlying sediments The large surface area of the floodplain additionally provides a large area for MeHg and results in a large flux of MeHg from the sediment to the surface water The model simulations and current mercury science suggest that if a large amount of suspended solids and mercury (both Hg(II) and MeHg) were released during a large event (the largest dredging event is Alternative 5D) then the system would recover relatively quickly in the fast flowing reaches upstream but the large slow flowing system and high ethylating region of Reach 8 would take significantly longer to recover This result is not surprising given that the conditions within GMNWR where seasonal flooding and drying over a vast riparian wetland bordering the Sudbury River create ideal conditions for methylation of mercury As has been noted in previous studies of this reach (Waldron et al 2000) GMNWR has very high methylmercury production even when compared with other wetland systems

Alternative 6 is the only active remedial alternative that specifically targets GMNWR so as expected no other alternative does as well as Alternative 6 in reducing fish tissue concentrations in Reach 8

42 Model Uncertainty

All enviromental models are simplifications of complex systems and therefore will never exactly predict observations It is therefore important to understand the uncertainty in a given model and to understand where its biases may be (USEPA 2009) Uncertainty due to the implementation of the WASP model for the Sudbury River itself were presented in more detail in Volume 1 These areas include the following

WASP solids transport and WASP segmentation Flood plain geometry Groundwater influence Two-year hydrologic cycle Influence of boudnary concentrations Methylation rate constants Unforeseen changes affecting the Sudbury River system model

Model uncertainty that deals specifically with the remedial alternatives detailed in this volume are discussed in more detail below

The number of types of solids (ie sands fines particulate organic matter) allowable in WASP is three plus the internal solid cobbles without reprogramming of the WASP architecture Therefore AquaBlokreg was modeled as organic matter with identical properties Another source of uncertainty for the AquaBlokreg capping scenarios was that AquaBlokreg was assumed to not resuspend To do this all WASP model segments that had AquaBlokreg added had resuspension of organic matter set to zero Therefore any organic matter that entered a WASP model water column

11

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 17: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

segment with an underlying AquaBlokreg sediment sample and then settled to the sediment layer would not resuspend This would increase the rate of burial in these zones and decrease the amount of interaction via resuspension of settled organic material resulting in potentially sequestering more mercury than may be occurring

The influence of groundwater on the capping implementation is unknown in regard For gaining sections of the river a significant upward flow of groundwater through the sediments could impact the integrity of any capped layers For example appreciable upward flow could result in a fracturing of the integrity of AquaBlokreg If the cap were fractured or preferential flow pathways developed then the ability of the cap to reduce the upward flux of mercury from sediments to the surface water would be compromised

The PRG was developed following the assumptions about fish consumption that were presented in the 2006 Human Health Risk Assessment thus they represent three-species hybrid [the HHRA assumes equal amounts of bass perch and catfish are consumed] However the BAF used in this modeling effort was based on only two species (bass and perch) which were collected in 2008 Generally the species not included (catfish) were very close to the mean concentration of the other two but in some reaches it was higher while in others it was lower The application of a 2shyspecies BAF to a 3-species PRG is another source of uncertainty

12

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 18: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

References

AquaBlokreg 2009 Personal communication with Eric Kraus on February 4 2009

Brigham ME Wentz DA Aiken GR Krabbenhoft DP 2009 Mercury Cycling in Stream Ecosystems 1 Water Column Chemistry and Transport Environmental Science amp Technology 432720-2725

Brumbaugh WG Krabbenhoft DP Helsel DR Wiener JG and Echols KR 2001 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems Along Multiple Gradients Bioaccumulation in Fish USGSBRDBSR-2001shy0009 iii+25pp

Frazier BE JG Wiener RG Rada DREngstrom 2000 Stratigraphy and Historic Accumulation of Mercury in Recent Depositional Sediments in the Sudbury River Massachusetts USA Canadian Journal of Fisheries and Aquatic Sciences571062-1072

Hurley JP Benoit JM Shafer MM Andren AA Sullivan JR Hammond R Webb DA 1995 Influences of Watershed Characteristics on Mercury Levels in Wisconsin Rivers Environmental Science amp Technology 29(7)1867-1875

Juma NG 1999 Introduction to Soil Science and Soil Resources Volume I in the Series The Pedosphere and its Dynamics A Systems Approach to Soil Science Salman Productions Sherwood Park 335 pp

Kelly CA JWM Rudd VL St Louis and A Heyes 1995 Is Total Mercury Concentration a Good Predictor of Methyl Mercury Concentration in Aquatic Systems Water Air and Soil Pollution 80(1-4) 715-724

Kelly CA JWM Rudd RA Bodaly NP Roulet VL St Louis A Heyes TR Moore S Schiff R Aravena KJ Scott B Dyck R Harris B Warner and G Edwards 1997 Increases in Fluxes of Greenhouse Gases and Methyl Mercury following Flooding of an Experimental Reservoir Environmental Science amp Technology 311334-1344

Krabbenhoft DP JG Wiener WG Brumbaugh ML Olson JF DeWild and TJ Sabin1999 A National Pilot Study of Mercury Contamination of Aquatic Ecosystems along Multiple Gradients US Geological Survey Toxic Substances Hydrology Program ndash Proceedings of the technical meeting Charleson SC March 8-12 1999 USGS Water Resources Investigations report 99-4018B Vol 2 p 147-160

13

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 19: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

St Louis VL Rudd JWM Kelly CA Beaty KG Bloom NS Flett RJ 1994 Importance of Wetlands as Sources of Methyl Mercury to Boreal Forest Ecosystems Canadian Journal of Fisheries and Aquatic Sciences 511065-1076

TechLaw 2009 Report Summarizing Data Collected for the Nyanza Mercury Modeling Effort Submitted to the Office of Environmental Measurement and Evaluation USEPA Region I North Chelmsford MA March 24

Tornado Motion Technologies 2009 Personal communication with Justin Warrington (Weston Solutions Inc) February 20

USEPA 2005 Contaminated Sediment Remediation Guidance for Hazardous Waste Sites Office of Solid Waste and Emergency Response (OSWER 93550-85) EPA Doc Number 540 R-05-012 December

USEPA 2010 Modeling Mercury Transport and Transformation along the Sudbury River Massachusetts (USA) with Implications for Regulatory Action Volume 1 Mercury Fate and Transport Prepared for USEPA Region I by USEPA ORDNERLERD

Waldron MC Colman JA Breault RF 2000 Distribution Hydrologic Transport and Cycling of Total Mercury and Methylmercury in a Contaminated River-Reservoir-Wetland System (Sudbury River eastern Massachusetts) Canadian Journal of Fisheries and Aquatic Sciences 57 1080-1091

14

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 20: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

TABLES

15

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 21: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 1 Summary Information for Modeled Reaches

Metric Units 3 4

Reach 5 6 7 8

Hazard Index Recreational -- 21 13 09 13 1 13 Angler Child HgT Sediment (mean) ugkg 15000 6590 1050 2530 300 470 HgT Sediment(median) ugkg 12600 7550 940 1900 130 390 MeHg Sediment (mean) ugkg 666 209 266 251 0927 259 MeHg Sediment (median) ugkg 56 215 163 185 0382 241

16

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 22: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 2 Remedial Alternatives Summary

Alternative Remedial Action Monitored Natural Recovery (MNA)

3A

Enhanced Natural Recovery Placement of sand where Sediment Total Mercury uniformly exceeds 10

3B mgkg

Enhanced Natural Recovery 3C Placement of sand where Sediment Hg gt 2 mgkg

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg in 4A Reach 3 only

In situ Containment with AquaBlokreg where Sediment Hg gt 2 mgkg 4B throughout the whole Sudbury River

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) 5A

Sediment Removal where Sediment Hg gt 10 mgkg (regardless of depth) and In situ Containment with AquaBlokreg where sediment Hg gt 2

5B mgkg

Sediment Removal where sediment Hg gt 2 mgkg in Reach 3 only 5C

Sediment Removal where sediment Hg gt 2 mgkg 5D throughout the whole Sudbury River (excluding Reach 8)

6 Sediment Removal in wetlands where sediment Hg gt 2 mgkg

17

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 23: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 3 Remedial Alternative Implementation Corresponding to Reach

Alternative

3A 3B

3 MNR ENR

4 MNR MNR

5 MNR MNR

Reach 6

MNR MNR

7 MNR MNR

8 MNR MNR

3C ENR ENR MNR ENR MNR MNR

4A 4B

5A

5B

Capping Capping Partial

Removal Partial

Removal Capping

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR Capping

MNR

Capping

MNR MNR

MNR

MNR

MNR MNR

MNR

MNR

5C Removal MNR MNR MNR MNR MNR

5D Removal Removal MNR Removal MNR MNR

6 MNR MNR MNR MNR MNR Removal Wetland

Restoration

Notes MNR Monitored Natural Recovery ENR Enhanced Natural Recovery (thin layer capping of 6rdquo sand) Capping In situ containment with 6rdquo of AquaBlok reg Partial Removal sediment removal where sediment Hg gt 10 mgkg Removal sediment removal where sediment Hg gt 2 mgkg

18

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 24: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 4 Seasonal Variability of Boundary Concentration Conditions for Hg(II) and MeHg

Date Hg(II) [ngL]

MeHg [ngL]

923 376 008 1223 274 0028 320 376 008 620 468 0208

19

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 25: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 5 Times for Dredging for Remedial Alternatives 5A 5B 5C and 5D

Remedial Alternative Time for Dredging 5A 43 days 5B 43 days 5C 73 days 5D 165 days

20

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 26: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 6 Alternative 3A (Base Case) Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 046 047 057 65 055 027 043 046 047 057 85 055 027 043 046 047 057

105 055 027 042 045 047 057 125 055 027 042 045 046 057 145 054 026 041 045 046 057 165 054 026 041 044 046 057 185 054 026 041 044 046 057 205 053 026 040 044 045 057 225 053 025 040 044 045 057 245 053 025 039 043 045 056 265 053 025 039 043 044 056 285 052 025 038 043 044 056 305 052 025 038 043 044 056 325 052 024 038 042 044 056 345 052 024 037 042 043 056

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 7 Alternative 3B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 047 019 030 035 035 056 65 047 019 030 035 035 055 85 047 019 030 035 035 055

105 047 019 030 035 035 054 125 047 019 030 035 035 054 145 047 019 029 035 035 054 165 047 019 029 035 035 054 185 047 019 029 035 035 053 205 047 019 029 034 035 053 225 047 019 029 034 035 053 245 047 019 029 034 035 053 265 047 019 029 034 034 052 285 047 019 029 034 034 052 305 047 019 029 034 034 052 325 047 019 029 034 034 052 345 046 019 029 034 034 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

1

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 27: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 8 Alternative 3C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 016 024 030 030 053 65 043 015 024 030 030 053 85 043 015 024 030 030 053

105 043 015 024 030 030 052 125 043 015 024 030 030 052 145 043 015 024 030 030 052 165 043 015 024 030 030 052 185 043 015 024 030 030 052 205 043 015 024 030 030 051 225 043 015 024 030 030 051 245 043 015 024 030 030 051 265 043 015 024 030 030 051 285 043 015 024 030 030 051 305 043 015 024 030 030 051 325 043 015 024 030 030 051 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 9 Alternative 4A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 021 031 037 038 057 65 043 021 031 037 038 056 85 043 021 031 037 038 056 105 043 021 031 037 038 056 125 043 021 031 037 038 055 145 043 021 031 036 038 055 165 043 021 031 036 038 055 185 043 021 031 036 038 054 205 043 021 031 036 037 054 225 043 021 030 036 037 054 245 043 021 030 036 037 054 265 043 020 030 036 037 053 285 043 020 030 036 037 053 305 043 020 030 036 037 053 325 043 020 030 036 037 053 345 043 020 030 036 037 053

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

2

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 28: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 10 Alternative 4B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 023 030 030 053 65 043 015 023 030 030 053 85 043 015 023 030 030 052 105 043 015 023 030 030 052 125 043 015 023 030 030 052 145 043 015 023 030 030 051 165 043 015 023 030 030 051 185 043 015 023 030 030 051 205 043 015 023 030 030 051 225 043 015 024 030 030 050 245 043 015 023 030 030 050 265 043 015 023 030 030 050 285 043 015 023 030 030 050 305 043 015 024 030 030 050 325 043 015 024 030 030 050 345 043 015 024 030 030 050

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 11 Alternative 5A Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 045 019 028 034 036 052

105 045 019 028 035 036 052 125 045 019 028 035 036 052 145 045 019 028 035 036 052 165 045 019 028 035 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 036 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

3

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 29: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 12 Alternative 5B Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 043 015 024 031 031 066 65 043 015 023 030 030 065 85 043 015 023 030 030 064 105 043 015 023 030 030 064 125 043 015 024 030 030 063 145 043 015 023 030 030 063 165 043 015 023 030 030 062 185 043 015 024 030 030 061 205 043 015 024 030 030 061 225 043 015 024 030 030 060 245 043 015 024 030 030 060 265 043 015 024 030 030 059 285 043 015 024 030 030 059 305 043 015 024 030 030 058 325 043 015 024 030 030 058 345 043 015 024 030 030 057

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 13 Alternative 5C Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 019 028 034 036 052 65 044 019 028 034 036 052 85 044 019 028 034 036 052

105 045 019 028 034 036 052 125 045 019 028 035 036 052 145 045 019 028 034 036 052 165 045 019 028 034 036 052 185 045 019 028 035 036 052 205 045 019 028 034 036 052 225 045 019 028 034 036 052 245 045 019 028 034 035 052 265 045 019 028 034 035 052 285 045 019 028 034 035 052 305 045 019 028 034 035 052 325 045 019 028 034 035 052 345 045 019 028 034 035 052

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

4

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 30: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Table 14 Alternative 5D Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 044 020 031 038 041 069 65 044 019 029 036 038 067 85 045 019 029 036 038 067

105 045 019 029 036 038 067 125 045 019 029 036 038 067 145 045 019 029 036 038 066 165 045 019 029 036 038 066 185 045 019 029 036 038 066 205 045 019 029 036 038 065 225 045 019 029 036 038 065 245 045 019 029 036 038 065 265 045 019 029 036 038 064 285 045 019 029 036 038 064 305 045 019 029 036 038 064 325 045 019 029 036 038 064 345 045 019 029 036 038 063

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

Table 15 Alternative 6 Simulated Fish Tissue Concentrations

Year Reach 3 Reach 4 Reach 5 Reach 6 Reach 7 Reach 8 45 055 027 043 045 046 051 65 055 027 043 046 046 051 85 055 027 043 045 046 051

105 055 027 042 045 046 051 125 055 027 042 045 046 051 145 054 027 041 044 045 050 165 054 026 041 044 045 050 185 054 026 041 044 045 050 205 053 026 040 043 044 050 225 053 026 040 043 044 049 245 053 025 039 043 044 049 265 053 025 039 043 043 049 285 052 025 038 042 043 049 305 052 025 038 042 043 048 325 052 025 038 042 043 048 345 052 024 037 042 042 048

Notes gt048 (PRG) 043 ndash 048 lt043 (backgroundreference concentration)

5

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 31: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

FIGURES

6

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 32: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 1 Sudbury River Focus Area

7

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 33: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 2 Delineation of WASP Segmentation for Reach 3

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

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Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

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Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 34: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 3 Delineation of WASP Segmentation for Reach 4

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 35: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 4 Delineation of WASP Segmentation for Reach 5

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 36: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 5 Delineation of WASP Segmentation for Reach 6

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

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Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

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Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 37: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 6 Delineation of WASP Segmentation for Reach 7

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

DRAFT

Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

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Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

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Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

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Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

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Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

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Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

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Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 38: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

Figure 7 Delineation of WASP Segmentation for Reach 8

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

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Figure 9 Sudbury River Segmentation for Reach 4

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

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Figure 13 Sudbury River Segmentation for Reach 8

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Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

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Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

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Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

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Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

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Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

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Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

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Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

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Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 39: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 8 Sudbury River Segmentation for Reach 3

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Figure 9 Sudbury River Segmentation for Reach 4

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Figure 10 Sudbury River Segmentation for Reach 5

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Figure 11 Sudbury River Segmentation for Reach 6

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Figure 12 Sudbury River Segmentation for Reach 7

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Figure 13 Sudbury River Segmentation for Reach 8

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Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

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Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

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Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

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Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

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Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

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Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

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Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

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Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

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Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 40: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

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Figure 9 Sudbury River Segmentation for Reach 4

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Figure 10 Sudbury River Segmentation for Reach 5

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Figure 11 Sudbury River Segmentation for Reach 6

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Figure 12 Sudbury River Segmentation for Reach 7

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Figure 13 Sudbury River Segmentation for Reach 8

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Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

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Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

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Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

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Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

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Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

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Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

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Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

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Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

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Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

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Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

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Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

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Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 41: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 10 Sudbury River Segmentation for Reach 5

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 42: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 11 Sudbury River Segmentation for Reach 6

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 43: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 12 Sudbury River Segmentation for Reach 7

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 44: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 13 Sudbury River Segmentation for Reach 8

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 45: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 14 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 3 4 and 5

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 46: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 15 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 3 4 and 5

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

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Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 47: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 16 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 3 4 and 5

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

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Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 48: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 17 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 3B and 3C for Reaches 6 7 and 8

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

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Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 49: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 18 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 4A and 4B for Reaches 6 7 and 8

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

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Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 50: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 19 Predicted Fish Tissue Mercury Concentrations versus Time for Remedial Alternatives 3A 5A 5B 5C and 5D for Reaches 6 7 and 8

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

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Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 51: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 20 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 3

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

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Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

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Seg

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Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 52: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 21 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 4

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

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t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

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Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

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men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 53: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Figure 22 Predicted Fish Tissue Mercury Concentrations versus Time for all Alternatives in Reach 8

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 54: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-1 Alternative 3A Monitored Natural Recovery (MNA)

Rea

ch

Seg

men

t Silts and Organic

SandsDescription Hg(II) MeHg Fines Matter

(mgL)(mgL) (mgL)

3 1 Upstream_Res_2 42 01 2 0 0 3 2 Reservoir_2_first_leg 42 01 2 0 0 3 3 Res2_secleg 38 01 2 0 0 3 4 Res2mid 31 01 2 0 0 4 5 Res2end 26 01 2 0 0 4 6 Res1from3 13 01 2 0 0 4 7 Reservoir1 29 01 2 0 0 5 8 SudburyRiverafterRes1 29 01 2 0 0 5 9 SudburyRiverReach9 29 01 2 0 0 5 10 SudburyRiverReach10 29 01 2 0 0 5 11 SudburyRiverReach11 29 01 2 0 0 5 12 SudburyRiverReach12 29 01 2 0 0 5 13 SudburyRiverReach13 29 01 2 0 0 5 14 SudburyRiverPond 29 01 2 0 0 6 15 start_of_Saxonville_Pond 29 01 2 0 0 6 16 midSaxonvillePond 29 01 2 0 0 6 17 endSaxonvillePond 29 01 2 0 0 7 18 SaxonvilleDam1 29 01 2 0 0 7 19 SaxonvilleDam2 29 01 2 0 0 7 20 SaxonvilleDam3 29 01 2 0 0 7 21 SaxonvilleDam4 29 01 2 0 0 7 22 HeardPondSwampMarsh 29 01 2 0 0 7 23 MarshReach24 29 01 6 0 0 8 24 UpofGMNWR 68 01 6 0 0 8 25 GMNWR1 70 01 6 0 0 8 26 GMNWR2 88 01 6 0 0 8 27 GMNWR3 68 01 6 0 0 8 28 GMNWR4 70 01 6 0 0 8 29 GMNWR5 68 01 6 0 0 8 30 GMNWR6 68 01 6 0 0 8 31 GMNWR7 68 01 6 0 0 8 32 GMNWR8 68 01 6 0 0 8 33 GMNWR9 68 01 6 0 0 3 34 SedUpstream_Res_2 34341 63 342000 0 21800 3 35 SedReservoir_2_first_leg 26045 51 407000 0 51500 3 36 SedRes2_secleg 48195 39 479000 5590 234000 3 37 SedRes2mid 129187 42 265000 52500 502000 4 38 SedRes2end 130000 40 115000 47300 444000 4 39 SedRes1from3 8681 13 369000 3470 136000 4 40 SedReservoir1 78807 23 144000 41200 358000 5 41 SedSudburyRiverafterRes1 2806 10 3 10 24 5 42 SedSudburyRiverReach9 433 02 99000 10 68800 5 43 SedSudburyRiverReach10 11100 29 125000 0 64500 5 44 SedSudburyRiverReach11 25150 55 155000 10 83400

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 55: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 SedSudburyRiverReach12 1717 08 153000 10 81600 5 46 SedSudburyRiverReach13 9414 16 2 0 32 5 47 SedSudburyRiverPond 11683 29 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 2108 08 652000 276 159000 6 49 SedmidSaxonvillePond 14753 11 533000 372 235000 6 50 SedendSaxonvillePond 37748 38 589000 2540 114000 7 51 SedSaxonvilleDam1 353 01 4 0 10 7 52 SedSaxonvilleDam2 314 00 44 0 647 7 53 SedSaxonvilleDam3 3534 04 10 0 248 7 54 SedSaxonvilleDam4 617 01 10 0 240 7 55 SedHeardPondSwampMarsh 18811 92 268000 10 106000 7 56 SedMarshReach24 2255 07 169000 10 69600 8 57 SedUpofGMNWR 67211 59 257000 10 60000 8 58 SedGMNWR1 1316 04 461000 135 293000 8 59 SedGMNWR2 959 03 478000 179 321000 8 60 SedGMNWR3 4365 38 461000 164 312000 8 61 SedGMNWR4 12830 112 455000 156 311000 8 62 SedGMNWR5 9986 53 457000 151 317000 8 63 SedGMNWR6 11910 45 454000 135 316000 8 64 SedGMNWR7 19180 168 441000 124 309000 8 65 SedGMNWR8 1191 02 452000 88 314000 8 66 SedGMNWR9 6760 24 471000 105 335000

67 SubSedUpstream_Res_2 133202 95 816000 0 50400 68 SubSedReservoir_2_first_leg 101024 76 770000 0 96200 69 SubSedRes2_secleg 100000 75 481000 36400 287000 70 SubSedRes2mid 45558 267 332000 88400 364000 71 SubSedRes2end 256288 33 424000 97500 350000 72 SubSedRes1from3 33672 20 526000 42200 256000 73 SubSedReservoir1 155364 18 295000 92200 363000 74 SubSedSudburyRiverafterRes1 20000 10 360000 100000 267000 75 SubSedSudburyRiverReach9 20000 10 323000 100000 230000 76 SubSedSudburyRiverReach10 20000 10 341000 99800 244000 77 SubSedSudburyRiverReach11 20000 10 352000 99700 257000 78 SubSedSudburyRiverReach12 20000 10 355000 99700 262000 79 SubSedSudburyRiverReach13 20000 10 360000 100000 267000 80 SubSedSudburyRiverPond 20000 10 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 20000 10 392000 85300 258000 82 SubSedmidSaxonvillePond 20000 10 363000 96000 280000 83 SubSedendSaxonvillePond 20000 10 697000 24600 172000 84 SubSedSaxonvilleDam1 20000 10 360000 100000 267000 85 SubSedSaxonvilleDam2 20000 10 342000 100000 248000 86 SubSedSaxonvilleDam3 20000 10 360000 100000 267000 87 SubSedSaxonvilleDam4 20000 10 360000 100000 267000 88 SubSedHeardPondSwampMarsh 43913 116 355000 100000 261000 89 SubSedMarshReach24 40000 20 358000 100000 264000 90 SubSedUpofGMNWR 78389 15 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 56: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

91 SubSedGMNWR1 15000 30 368000 97100 266000 92 SubSedGMNWR2 15000 30 366000 98100 268000 93 SubSedGMNWR3 15000 30 364000 98600 268000 94 SubSedGMNWR4 14789 49 363000 98800 267000 95 SubSedGMNWR5 15000 30 362000 98900 267000 96 SubSedGMNWR6 15000 30 362000 99000 267000 97 SubSedGMNWR7 17045 77 362000 99200 267000 98 SubSedGMNWR8 15000 30 364000 98700 268000 99 SubSedGMNWR9 15000 30 362000 99300 267000 100 Deep_Res2end 00 00 0 0 0 101 SedDeep_Res2end 210262 64 108000 3010 514000 102 SubSedDeep_Res2end 276061 135 262000 93300 513000 103 ThirdSed_Deep_Res2end 268507 33 342000 155000 371000 104 FourthSed_Deep_Res2end 217369 11 409000 216000 332000 105 ThirdSed_Upstream_Res_2 30000 20 616000 98100 152000 106 ThirdSed_Reservoir_2_first_leg 25725 65 484000 159000 224000 107 ThirdSed_Res2_secleg 38195 125 310000 287000 270000 108 ThirdSed_Res2mid 8178 198 426000 174000 267000 109 ThirdSed_Res2end 130773 07 450000 150000 267000 110 ThirdSed_Res1from3 30000 20 449000 149000 267000 111 ThirdSed_Reservoir1 30000 20 450000 150000 268000 112 FourthSed_Upstream_Res_2 30000 20 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 12256 124 444000 186000 272000 114 FourthSed_Res2_secleg 5098 172 354000 250000 270000 115 FourthSed_Res2mid 35452 49 384000 216000 267000 116 FourthSed_Res2end 30787 19 384000 216000 267000 117 FourthSed_Res1from3 30000 20 388000 216000 267000 118 FourthSed_Reservoir1 30000 20 384000 216000 267000

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

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Seg

men

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Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

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Seg

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Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 57: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-2 Alternative 3B Thin Layer (Sand) Placement

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 Upstream_Res_2 420 005 2 0 0 3 2 Reservoir_2_first_leg 421 005 2 0 0 3 3 Res2_secleg 377 005 2 0 0 3 4 Res2mid 314 005 2 0 0 4 5 Res2end 264 005 2 0 0 4 6 Res1from3 132 005 2 0 0 4 7 Reservoir1 288 005 2 0 0 5 8 SudburyRiverafterRes1 290 005 2 0 0 5 9 SudburyRiverReach9 290 005 2 0 0 5 10 SudburyRiverReach10 290 005 2 0 0 5 11 SudburyRiverReach11 290 005 2 0 0 5 12 SudburyRiverReach12 290 005 2 0 0 5 13 SudburyRiverReach13 290 005 2 0 0 5 14 SudburyRiverPond 290 005 2 0 0 6 15 start_of_Saxonville_Pond 290 005 2 0 0 6 16 midSaxonvillePond 290 005 2 0 0 6 17 endSaxonvillePond 290 005 2 0 0 7 18 SaxonvilleDam1 290 005 2 0 0 7 19 SaxonvilleDam2 290 005 2 0 0 7 20 SaxonvilleDam3 290 005 2 0 0 7 21 SaxonvilleDam4 290 005 2 0 0 7 22 HeardPondSwampMarsh 290 005 2 0 0 7 23 MarshReach24 290 005 6 0 0 8 24 UpofGMNWR 680 005 6 0 0 8 25 GMNWR1 704 005 6 0 0 8 26 GMNWR2 882 005 6 0 0 8 27 GMNWR3 677 005 6 0 0 8 28 GMNWR4 704 005 6 0 0 8 29 GMNWR5 675 005 6 0 0 8 30 GMNWR6 675 005 6 0 0 8 31 GMNWR7 675 005 6 0 0 8 32 GMNWR8 675 005 6 0 0 8 33 GMNWR9 675 005 6 0 0 3 34 SedUpstream_Res_2 000 000 0 1550000 0 3 35 SedReservoir_2_first_leg 000 000 0 1550000 0 3 36 SedRes2_secleg 000 000 0 1550000 0 3 37 SedRes2mid 000 000 0 1550000 0 4 38 SedRes2end 000 000 0 1550000 0 4 39 SedRes1from3 000 000 0 1550000 0 4 40 SedReservoir1 0 0 0 1550000 0 5 41 SedSudburyRiverafterRes1 281 1 3 10 24 5 42 SedSudburyRiverReach9 43 0 99000 10 68800 5 43 SedSudburyRiverReach10 1110 3 125000 0 64500 5 44 SedSudburyRiverReach11 2515 5 155000 10 83400 5 45 SedSudburyRiverReach12 172 1 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

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Seg

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Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

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Seg

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Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

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Seg

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3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 58: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

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Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 SedSudburyRiverReach13 941 2 2 0 32 5 47 SedSudburyRiverPond 1168 3 630000 35 88100 6 48 Sedstart_of_Saxonville_Pond 0 0 0 1550000 0 6 49 SedmidSaxonvillePond 0 0 0 1550000 0 6 50 SedendSaxonvillePond 0 0 0 1550000 0 7 51 SedSaxonvilleDam1 35 0 4 0 10 7 52 SedSaxonvilleDam2 31 0 44 0 647 7 53 SedSaxonvilleDam3 353 0 10 0 248 7 54 SedSaxonvilleDam4 62 0 10 0 240 7 55 SedHeardPondSwampMarsh 1881 9 268000 10 106000 7 56 SedMarshReach24 226 1 169000 10 69600 8 57 SedUpofGMNWR 6721 6 257000 10 60000 8 58 SedGMNWR1 132 0 461000 135 293000 8 59 SedGMNWR2 96 0 478000 179 321000 8 60 SedGMNWR3 436 4 461000 164 312000 8 61 SedGMNWR4 1283 11 455000 156 311000 8 62 SedGMNWR5 999 5 457000 151 317000 8 63 SedGMNWR6 1191 4 454000 135 316000 8 64 SedGMNWR7 1918 17 441000 124 309000 8 65 SedGMNWR8 119 0 452000 88 314000 8 66 SedGMNWR9 676 2 471000 105 335000

67 SubSedUpstream_Res_2 3434 6 342000 0 21800 68 SubSedReservoir_2_first_leg 2605 5 407000 0 51500 69 SubSedRes2_secleg 4820 4 479000 5590 234000 70 SubSedRes2mid 12919 4 265000 52500 502000 71 SubSedRes2end 13000 4 115000 47300 444000 72 SubSedRes1from3 868 1 369000 3470 136000 73 SubSedReservoir1 7881 2 144000 41200 358000 74 SubSedSudburyRiverafterRes1 2000 1 360000 100000 267000 75 SubSedSudburyRiverReach9 2000 1 323000 100000 230000 76 SubSedSudburyRiverReach10 2000 1 341000 99800 244000 77 SubSedSudburyRiverReach11 2000 1 352000 99700 257000 78 SubSedSudburyRiverReach12 2000 1 355000 99700 262000 79 SubSedSudburyRiverReach13 2000 1 360000 100000 267000 80 SubSedSudburyRiverPond 2000 1 310000 75200 165000 81 SubSedstart_of_Saxonville_Pond 2000 1 392000 85300 258000 82 SubSedmidSaxonvillePond 2000 1 363000 96000 280000 83 SubSedendSaxonvillePond 2000 1 697000 24600 172000 84 SubSedSaxonvilleDam1 2000 1 652000 276 159000 85 SubSedSaxonvilleDam2 2000 1 533000 372 235000 86 SubSedSaxonvilleDam3 2000 1 589000 2540 114000 87 SubSedSaxonvilleDam4 2000 1 360000 100000 267000 88 SubSedHeardPondSwampMarsh 4391 12 355000 100000 261000 89 SubSedMarshReach24 4000 2 358000 100000 264000 90 SubSedUpofGMNWR 7839 2 329000 90200 232000 91 SubSedGMNWR1 1500 3 368000 97100 266000

DRAFT

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Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

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Seg

men

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Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

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Seg

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Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 59: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Description Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 SubSedGMNWR2 1500 3 366000 98100 268000 93 SubSedGMNWR3 1500 3 364000 98600 268000 94 SubSedGMNWR4 1479 5 363000 98800 267000 95 SubSedGMNWR5 1500 3 362000 98900 267000 96 SubSedGMNWR6 1500 3 362000 99000 267000 97 SubSedGMNWR7 1705 8 362000 99200 267000 98 SubSedGMNWR8 1500 3 364000 98700 268000 99 SubSedGMNWR9 1500 3 362000 99300 267000 100 Deep_Res2end 0 0 0 0 0 101 SedDeep_Res2end 0 0 0 155000 0 102 SubSedDeep_Res2end 21026 6 108000 3010 514000 103 ThirdSed_Deep_Res2end 27606 13 262000 93300 513000 104 FourthSed_Deep_Res2end 26851 3 342000 155000 371000 105 ThirdSed_Upstream_Res_2 13320 10 816000 0 50400 106 ThirdSed_Reservoir_2_first_leg 10102 8 770000 0 96200 107 ThirdSed_Res2_secleg 10000 8 481000 36400 287000 108 ThirdSed_Res2mid 4556 27 332000 88400 364000 109 ThirdSed_Res2end 25629 3 424000 97500 350000 110 ThirdSed_Res1from3 3367 2 526000 42200 256000 111 ThirdSed_Reservoir1 15536 2 295000 92200 363000 112 FourthSed_Upstream_Res_2 3000 2 509000 172000 251000 113 FourthSed_Reservoir_2_first_leg 1226 12 444000 186000 272000 114 FourthSed_Res2_secleg 510 17 354000 250000 270000 115 FourthSed_Res2mid 3545 5 384000 216000 267000 116 FourthSed_Res2end 3079 2 384000 216000 267000 117 FourthSed_Res1from3 3000 2 388000 216000 267000 118 FourthSed_Reservoir1 3000 2 384000 216000 267000

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 60: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-3 Alternative 4A AquaBlokreg Capping of Reservoir 2

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t 3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 86810 134 000 1550000 000 4 40 788073 226 000 1550000 000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 61: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

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Seg

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t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 21075 081 000 1550000 000 6 49 147527 111 000 1550000 000 6 50 377483 384 000 1550000 000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 336720 201 36900000 347000 13600000 4 73 1553640 184 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 200000 100 39200000 8530000 25800000 6 82 200000 100 36300000 9600000 28000000 6 83 200000 100 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000

DRAFT

Rea

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Seg

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t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 62: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 36600000 9810000 26800000 8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 300000 200 52600000 4220000 25600000 4 111 300000 200 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 63: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-4 Alternative 4B AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 299 998 2360 5 42 4326 021 9900000 1000 6880000 5 43 111000 289 12500000 000 6450000 5 44 251500 550 15500000 1000 8340000 5 45 17170 077 15300000 1000 8160000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 64: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 94140 163 183 000 3170 5 47 116828 291 63000000 3540 8810000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 358 000 1000 7 52 3144 002 4350 029 64700 7 53 35340 039 990 000 24800 7 54 6167 009 985 000 24000 7 55 188110 920 26800000 1000 10600000 7 56 22553 075 16900000 1000 6960000 8 57 672113 588 25700000 1000 6000000 8 58 13160 037 46100000 13500 29300000 8 59 9593 027 47800000 17900 32100000 8 60 43649 376 46100000 16400 31200000 8 61 128303 1123 45500000 15600 31100000 8 62 99860 533 45700000 15100 31700000 8 63 119100 447 45400000 13500 31600000 8 64 191795 1680 44100000 12400 30900000 8 65 11913 023 45200000 8830 31400000 8 66 67600 241 47100000 10500 33500000 3 67 343410 634 34200000 000 2180000 3 68 260451 507 40700000 000 5150000 3 69 481951 394 47900000 559000 23400000 3 70 1291871 416 26500000 5250000 50200000 3 71 1300000 400 11500000 4730000 44400000 4 72 86810 134 36900000 347000 13600000 4 73 788073 226 14400000 4120000 35800000 5 74 200000 100 36000000 10000000 26700000 5 75 200000 100 32300000 10000000 23000000 5 76 200000 100 34100000 9980000 24400000 5 77 200000 100 35200000 9970000 25700000 5 78 200000 100 35500000 9970000 26200000 5 79 200000 100 36000000 10000000 26700000 5 80 200000 100 31000000 7520000 16500000 6 81 21075 081 39200000 8530000 25800000 6 82 147527 111 36300000 9600000 28000000 6 83 377483 384 69700000 2460000 17200000 7 84 200000 100 65200000 27600 15900000 7 85 200000 100 53300000 37200 23500000 7 86 200000 100 58900000 254000 11400000 7 87 200000 100 36000000 10000000 26700000 7 88 439132 1159 35500000 10000000 26100000 7 89 400000 200 35800000 10000000 26400000 8 90 783891 155 32900000 9020000 23200000 8 91 150000 300 36800000 9710000 26600000 8 92 150000 300 36600000 9810000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 65: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t

Silts and Organic Sands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 93 150000 300 36400000 9860000 26800000 8 94 147890 485 36300000 9880000 26700000 8 95 150000 300 36200000 9890000 26700000 8 96 150000 300 36200000 9900000 26700000 8 97 170453 773 36200000 9920000 26700000 8 98 150000 300 36400000 9870000 26800000 8 99 150000 300 36200000 9930000 26700000

100 000 000 000 000 100 101 000 000 000 000 48640000 102 2102622 641 10800000 301000 51400000 103 2760605 1345 26200000 9330000 51300000 104 2685070 330 34200000 15500000 37100000

3 105 1332024 951 81600000 000 5040000 3 106 1010240 760 77000000 000 9620000 3 107 1000000 750 48100000 3640000 28700000 3 108 455580 2670 33200000 8840000 36400000 3 109 2562875 325 42400000 9750000 35000000 4 110 336720 201 52600000 4220000 25600000 4 111 1553640 184 29500000 9220000 36300000 3 112 300000 200 50900000 17200000 25100000 3 113 257250 650 44400000 18600000 27200000 3 114 381950 1250 35400000 25000000 27000000 3 115 81775 1975 38400000 21600000 26700000 3 116 1307730 070 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 66: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-5 Alternative 5A Dredging of Reservoir 2 (excluding Segment 1)

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 343410 6344 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 67: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 1332024 9506931 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000

DRAFT

Rea

ch

Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 68: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t Silts Organic

and SandsHg(II) MeHg Matter

Fines (mgL) (mgL)

(mgL)

91 150000 3 368000 97100 266000 92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000

100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 300000 2 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 300000 2 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 69: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-6 Alternative 5B Dredging of Reservoir 2 AquaBlokreg capping of Reservoirs 2 and 1 and Saxonville Dam (excluding Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 200 000 030 3 2 421 005 200 000 030 3 3 377 005 200 000 030 3 4 314 005 200 000 030 3 5 264 005 200 000 030 4 6 132 005 200 000 030 4 7 288 005 200 000 030 5 8 290 005 200 000 030 5 9 290 005 200 000 030 5 10 290 005 200 000 030 5 11 290 005 200 000 030 5 12 290 005 200 000 030 5 13 290 005 200 000 030 5 14 290 005 200 000 030 6 15 290 005 200 000 030 6 16 290 005 200 000 030 6 17 290 005 200 000 030 7 18 290 005 200 000 030 7 19 290 005 200 000 030 7 20 290 005 200 000 030 7 21 290 005 200 000 030 7 22 290 005 200 000 030 7 23 290 005 600 000 030 8 24 680 005 600 000 030 8 25 704 005 600 000 030 8 26 882 005 600 000 030 8 27 677 005 600 000 030 8 28 704 005 600 000 030 8 29 675 005 600 000 030 8 30 675 005 600 000 030 8 31 675 005 600 000 030 8 32 675 005 600 000 030 8 33 675 005 600 000 030 3 34 000 000 000 000 48640000 3 35 000 000 000 000 48640000 3 36 000 000 000 000 48640000 3 37 000 000 000 000 48640000 3 38 000 000 000 000 48640000 4 39 000 000 000 000 48640000 4 40 000 000 000 000 48640000 5 41 28057 104 998 2360 32800 5 42 4326 021 1000 6880000 35280 5 43 111000 289 000 6450000 31360 5 44 251500 550 1000 8340000 25200

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 70: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 077 1000 8160000 25200 5 46 94140 163 000 3170 31560 5 47 116828 291 3540 8810000 70000 6 48 000 000 000 000 48640000 6 49 000 000 000 000 48640000 6 50 000 000 000 000 48640000 7 51 3526 012 000 1000 38320 7 52 3144 002 029 64700 40840 7 53 35340 039 000 24800 35880 7 54 6167 009 000 24000 43000 7 55 188110 920 1000 10600000 1500000 7 56 22553 075 1000 6960000 254000 8 57 672113 588 1000 6000000 39280 8 58 13160 037 13500 29300000 46920 8 59 9593 027 17900 32100000 40400 8 60 43649 376 16400 31200000 53040 8 61 128303 1123 15600 31100000 52000 8 62 99860 533 15100 31700000 41840 8 63 119100 447 13500 31600000 42160 8 64 191795 1680 12400 30900000 49560 8 65 11913 023 8830 31400000 44200 8 66 67600 241 10500 33500000 58760 3 67 100000 100 000 5040000 40200 3 68 100000 100 000 9620000 84700 3 69 100000 100 3640000 28700000 335000 3 70 100000 100 8840000 36400000 455100 3 71 100000 100 9750000 35000000 1464000 4 72 336720 201 4220000 25600000 1449000 4 73 1553640 184 9220000 36300000 385840 5 74 200000 100 10000000 26700000 82000 5 75 200000 100 10000000 23000000 88200 5 76 200000 100 9980000 24400000 78400 5 77 200000 100 9970000 25700000 63000 5 78 200000 100 9970000 26200000 63000 5 79 200000 100 10000000 26700000 78900 5 80 200000 100 7520000 16500000 175000 6 81 200000 100 8530000 25800000 360000 6 82 200000 100 9600000 28000000 360000 6 83 200000 100 2460000 17200000 360000 7 84 200000 100 10000000 26700000 95800 7 85 200000 100 10000000 24800000 102100 7 86 200000 100 10000000 26700000 89700 7 87 200000 100 10000000 26700000 107500 7 88 439132 1159 10000000 26100000 3750000 7 89 400000 200 10000000 26400000 635000 8 90 783891 155 9020000 23200000 98200 8 91 150000 300 9710000 26600000 117300

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 71: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

8 92 150000 300 9810000 26800000 101000 8 93 150000 300 9860000 26800000 132600 8 94 147890 485 9880000 26700000 130000 8 95 150000 300 9890000 26700000 104600 8 96 150000 300 9900000 26700000 105400 8 97 170453 773 9920000 26700000 123900 8 98 150000 300 9870000 26800000 110500 8 99 150000 300 9930000 26700000 146900

100 000 000 000 000 100 101 100000 100 40900000 21600000 33200000 102 100000 100 40900000 21600000 33200000 103 100000 100 40900000 21600000 33200000 104 100000 100 40900000 21600000 33200000

3 105 100000 100 50900000 17200000 25100000 3 106 100000 100 44400000 18600000 27200000 3 107 100000 100 35400000 25000000 27000000 3 108 100000 100 38400000 21600000 26700000 3 109 100000 100 38400000 21600000 26700000 4 110 300000 200 38800000 21600000 26700000 4 111 300000 200 38400000 21600000 26700000 3 112 300000 200 50900000 17200000 25100000 3 113 100000 100 44400000 18600000 27200000 3 114 100000 100 35400000 25000000 27000000 3 115 100000 100 38400000 21600000 26700000 3 116 100000 100 38400000 21600000 26700000 4 117 300000 200 38800000 21600000 26700000 4 118 300000 200 38400000 21600000 26700000

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 72: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-7 Alternative 5C Dredging of the entire Reservoir 2 (including Segment 1)

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 42 01 2 0 0 3 2 42 01 2 0 0 3 3 38 01 2 0 0 3 4 31 01 2 0 0 4 5 26 01 2 0 0 4 6 13 01 2 0 0 4 7 29 01 2 0 0 5 8 29 01 2 0 0 5 9 29 01 2 0 0 5 10 29 01 2 0 0 5 11 29 01 2 0 0 5 12 29 01 2 0 0 5 13 29 01 2 0 0 5 14 29 01 2 0 0 6 15 29 01 2 0 0 6 16 29 01 2 0 0 6 17 29 01 2 0 0 7 18 29 01 2 0 0 7 19 29 01 2 0 0 7 20 29 01 2 0 0 7 21 29 01 2 0 0 7 22 29 01 2 0 0 7 23 29 01 6 0 0 8 24 68 01 6 0 0 8 25 70 01 6 0 0 8 26 88 01 6 0 0 8 27 68 01 6 0 0 8 28 70 01 6 0 0 8 29 68 01 6 0 0 8 30 68 01 6 0 0 8 31 68 01 6 0 0 8 32 68 01 6 0 0 8 33 68 01 6 0 0 3 34 10000 10 509000 172000 251000 3 35 10000 10 444000 186000 272000 3 36 10000 10 354000 250000 270000 3 37 10000 10 384000 216000 267000 4 38 10000 10 384000 216000 267000 4 39 8681 13 388000 216000 267000 4 40 78807 23 384000 216000 267000 5 41 2806 10 3 10 24 5 42 433 02 99000 10 68800 5 43 11100 29 125000 0 64500 5 44 25150 55 155000 10 83400 5 45 1717 08 153000 10 81600

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 73: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

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Seg

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Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 46 9414 16 2 0 32 5 47 11683 29 630000 35 88100 6 48 2108 08 652000 276 159000 6 49 14753 11 533000 372 235000 6 50 37748 38 589000 2540 114000 7 51 353 01 4 0 10 7 52 314 00 44 0 647 7 53 3534 04 10 0 248 7 54 617 01 10 0 240 7 55 18811 92 268000 10 106000 7 56 2255 07 169000 10 69600 8 57 67211 59 257000 10 60000 8 58 1316 04 461000 135 293000 8 59 959 03 478000 179 321000 8 60 4365 38 461000 164 312000 8 61 12830 112 455000 156 311000 8 62 9986 53 457000 151 317000 8 63 11910 45 454000 135 316000 8 64 19180 168 441000 124 309000 8 65 1191 02 452000 88 314000 8 66 6760 24 471000 105 335000

67 10000 10 509000 172000 251000 68 10000 10 444000 186000 272000 69 10000 10 354000 250000 270000 70 10000 10 384000 216000 267000 71 10000 10 384000 216000 267000 72 30000 20 388000 216000 267000 73 30000 20 384000 216000 267000 74 20000 10 360000 100000 267000 75 20000 10 323000 100000 230000 76 20000 10 341000 99800 244000 77 20000 10 352000 99700 257000 78 20000 10 355000 99700 262000 79 20000 10 360000 100000 267000 80 20000 10 310000 75200 165000 81 20000 10 392000 85300 258000 82 20000 10 363000 96000 280000 83 20000 10 697000 24600 172000 84 20000 10 360000 100000 267000 85 20000 10 342000 100000 248000 86 20000 10 360000 100000 267000 87 20000 10 360000 100000 267000 88 43913 116 355000 100000 261000 89 40000 20 358000 100000 264000 90 78389 15 329000 90200 232000 91 15000 30 368000 97100 266000 92 15000 30 366000 98100 268000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 74: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

93 15000 30 364000 98600 268000 94 14789 49 363000 98800 267000 95 15000 30 362000 98900 267000 96 15000 30 362000 99000 267000 97 17045 77 362000 99200 267000 98 15000 30 364000 98700 268000 99 15000 30 362000 99300 267000 100 00 00 0 0 0 101 10000 10 409000 216000 332000 102 10000 10 409000 216000 332000 103 10000 10 409000 216000 332000 104 10000 10 409000 216000 332000 105 10000 10 509000 172000 251000 106 10000 10 444000 186000 272000 107 10000 10 354000 250000 270000 108 10000 10 384000 216000 267000 109 10000 10 384000 216000 267000 110 30000 20 388000 216000 267000 111 30000 20 384000 216000 267000 112 10000 10 509000 172000 251000 113 10000 10 444000 186000 272000 114 10000 10 354000 250000 270000 115 10000 10 384000 216000 267000 116 10000 10 384000 216000 267000 117 30000 20 388000 216000 267000 118 30000 20 384000 216000 267000

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 75: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-8 Alternative 5D AquaBlokreg Capping of Reservoirs 2 and 1 and Saxonville Dam

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

3 1 420 005 2 0 0 3 2 421 005 2 0 0 3 3 377 005 2 0 0 3 4 314 005 2 0 0 4 5 264 005 2 0 0 4 6 132 005 2 0 0 4 7 288 005 2 0 0 5 8 290 005 2 0 0 5 9 290 005 2 0 0 5 10 290 005 2 0 0 5 11 290 005 2 0 0 5 12 290 005 2 0 0 5 13 290 005 2 0 0 5 14 290 005 2 0 0 6 15 290 005 2 0 0 6 16 290 005 2 0 0 6 17 290 005 2 0 0 7 18 290 005 2 0 0 7 19 290 005 2 0 0 7 20 290 005 2 0 0 7 21 290 005 2 0 0 7 22 290 005 2 0 0 7 23 290 005 6 0 0 8 24 680 005 6 0 0 8 25 704 005 6 0 0 8 26 882 005 6 0 0 8 27 677 005 6 0 0 8 28 704 005 6 0 0 8 29 675 005 6 0 0 8 30 675 005 6 0 0 8 31 675 005 6 0 0 8 32 675 005 6 0 0 8 33 675 005 6 0 0 3 34 100000 1 509000 172000 251000 3 35 100000 1 444000 186000 272000 3 36 100000 1 354000 250000 270000 3 37 100000 1 384000 216000 267000 4 38 100000 1 384000 216000 267000 4 39 86810 134 369000 3470 136000 4 40 788073 2262091 144000 41200 358000 5 41 28057 1041 3 10 24 5 42 4326 0214 99000 10 68800 5 43 111000 2888 125000 0 64500 5 44 251500 54955 155000 10 83400

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 76: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 45 17170 0767 153000 10 81600 5 46 94140 1628 2 0 32 5 47 116828 29116 630000 35 88100 6 48 21075 0814 652000 276 159000 6 49 147527 11092 533000 372 235000 6 50 377483 3839333 589000 2540 114000 7 51 3526 01245 4 0 10 7 52 3144 0024 44 0 647 7 53 35340 0394 10 0 248 7 54 6167 0088 10 0 240 7 55 188110 9195959 268000 10 106000 7 56 22553 074725 169000 10 69600 8 57 672113 5876803 257000 10 60000 8 58 13160 0369 461000 135 293000 8 59 9593 0267667 478000 179 321000 8 60 43649 3756667 461000 164 312000 8 61 128303 11225 455000 156 311000 8 62 99860 5328 457000 151 317000 8 63 119100 4471 454000 135 316000 8 64 191795 168 441000 124 309000 8 65 11913 02255 452000 88 314000 8 66 67600 2409 471000 105 335000

67 100000 1 816000 0 50400 68 100000 1 770000 0 96200 69 100000 1 481000 36400 287000 70 100000 1 332000 88400 364000 71 100000 1 424000 97500 350000 72 336720 2008084 526000 42200 256000 73 1553640 1837949 295000 92200 363000 74 200000 1 360000 100000 267000 75 200000 1 323000 100000 230000 76 200000 1 341000 99800 244000 77 200000 1 352000 99700 257000 78 200000 1 355000 99700 262000 79 200000 1 360000 100000 267000 80 200000 1 310000 75200 165000 81 200000 1 392000 85300 258000 82 200000 1 363000 96000 280000 83 200000 1 697000 24600 172000 84 200000 1 360000 100000 267000 85 200000 1 342000 100000 248000 86 200000 1 360000 100000 267000 87 200000 1 360000 100000 267000 88 439132 1158553 355000 100000 261000 89 400000 2 358000 100000 264000 90 783891 1547522 329000 90200 232000 91 150000 3 368000 97100 266000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 77: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

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Seg

men

t

Silts and OrganicSands

Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

92 150000 3 366000 98100 268000 93 150000 3 364000 98600 268000 94 147890 485 363000 98800 267000 95 150000 3 362000 98900 267000 96 150000 3 362000 99000 267000 97 170453 7725 362000 99200 267000 98 150000 3 364000 98700 268000 99 150000 3 362000 99300 267000 100 000 0 0 0 0 101 100000 1 409000 216000 332000 102 100000 1 409000 216000 332000 103 100000 1 409000 216000 332000 104 100000 1 409000 216000 332000 105 100000 1 509000 172000 251000 106 100000 1 444000 186000 272000 107 100000 1 354000 250000 270000 108 100000 1 384000 216000 267000 109 100000 1 384000 216000 267000 110 300000 2 449000 149000 267000 111 300000 2 450000 150000 268000 112 100000 1 509000 172000 251000 113 100000 1 444000 186000 272000 114 100000 1 354000 250000 270000 115 100000 1 384000 216000 267000 116 100000 1 384000 216000 267000 117 300000 2 388000 216000 267000 118 300000 2 384000 216000 267000

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 78: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-9 Alternative 5A and 5B Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 2

Silts (kg)

892

Sands (kg)

146

Organic Matter

(kg) 273

Hg(II) (kg)

562x10-4

MeHg (kg)

109x10-6

3 688 245 449 646x10-4 147x10-6

4 596 225 593 760x10-4 193x10-6

5 581 216 562 187x10-3 316x10-7

Table A-10 Alternative 5C Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter

(kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

Table A-11 Alternative 5D Calculated loadings for mercury and solids into given water column segments from dredging underlying sediment layers

Loading into

Segment 1

Silts (kg)

1398

Sands (kg)

260

Organic Matter (kg) 414

Hg(II) (kg)

93x10-4

MeHg (kg)

76x10-7

2 1268 304 503 72x10-4 12x10-6

3 988 457 678 79x10-4 16x10-6

4 921 408 819 91x10-4 21x10-6

5 907 399 789 20x10-3 46x10-7

6 1062 357 618 61x10-4 47x10-7

7 864 394 758 12x10-3 48x10-7

15 1206 202 679 36x10-4 20x10-7

16 1087 228 764 40x10-4 21x10-7

17 1902 59 456 54x10-4 33x10-7

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 79: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Table A-12 Alternative 6A Dredging of the Great Meadows Wildlife Refuge (Wetlands)

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)Rea

ch

Seg

men

t

3 1 45 000 420 005 200 000 000 3 2 45 000 421 005 200 000 000 3 3 40 000 377 005 200 000 000 3 4 33 000 314 005 200 000 000 4 5 28 000 264 005 200 000 000 4 6 14 000 132 005 200 000 000 4 7 30 000 288 005 200 000 000 5 8 30 000 290 005 200 000 000 5 9 30 000 290 005 200 000 000 5 10 30 000 290 005 200 000 000 5 11 30 000 290 005 200 000 000 5 12 30 000 290 005 200 000 000 5 13 30 000 290 005 200 000 000 5 14 30 000 290 005 200 000 000 6 15 30 000 290 005 200 000 000 6 16 30 000 290 005 200 000 000 6 17 30 000 290 005 200 000 000 7 18 30 000 290 005 200 000 000 7 19 30 000 290 005 200 000 000 7 20 30 000 290 005 200 000 000 7 21 30 000 290 005 200 000 000 7 22 30 000 290 005 200 000 000 7 23 30 000 290 005 600 000 000 8 24 70 000 680 005 600 000 000 8 25 73 000 704 005 600 000 000 8 26 90 000 882 005 600 000 000 8 27 70 000 677 005 600 000 000 8 28 73 000 704 005 600 000 000 8 29 70 000 675 005 600 000 000 8 30 70 000 675 005 600 000 000 8 31 70 000 675 005 600 000 000 8 32 70 000 675 005 600 000 000 8 33 70 000 675 005 600 000 000 3 34 34404 000 343410 634 34200000 000 2180000 3 35 26096 000 260451 507 40700000 000 5150000 3 36 48235 000 481951 394 47900000 559000 23400000 3 37 129229 000 1291871 416 26500000 5250000 50200000 4 38 130040 000 1300000 400 11500000 4730000 44400000 4 39 8694 000 86810 134 36900000 347000 13600000 4 40 78830 000 788073 226 14400000 4120000 35800000 5 41 2816 000 28057 104 299 998 2360 5 42 435 000 4326 021 9900000 1000 6880000 5 43 11129 000 111000 289 12500000 000 6450000 5 44 25205 000 251500 550 15500000 1000 8340000 5 45 1725 000 17170 077 15300000 1000 8160000 5 46 9430 000 94140 163 183 000 3170

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 80: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

5 47 11712 000 116828 291 63000000 3540 8810000 6 48 2116 000 21075 081 65200000 27600 15900000 6 49 14764 000 147527 111 53300000 37200 23500000 6 50 37787 000 377483 384 58900000 254000 11400000 7 51 354 000 3526 012 358 000 1000 7 52 315 000 3144 002 4350 029 64700 7 53 3538 000 35340 039 990 000 24800 7 54 618 000 6167 009 985 000 24000 7 55 18903 000 188110 920 26800000 1000 10600000 7 56 2263 000 22553 075 16900000 1000 6960000 8 57 67270 000 672113 588 25700000 1000 6000000 8 58 39 000 300 090 36800000 9710000 26600000 8 59 39 000 300 090 36600000 9810000 26800000 8 60 39 000 300 090 36400000 9860000 26800000 8 61 39 000 300 090 36300000 9880000 26700000 8 62 39 000 300 090 36200000 9890000 26700000 8 63 39 000 300 090 36200000 9900000 26700000 8 64 39 000 300 090 36200000 9920000 26700000 8 65 39 000 300 090 36400000 9870000 26800000 8 66 39 000 300 090 36200000 9930000 26700000 67 133297 000 1332024 951 81600000 000 5040000

68 101100 000 1010240 760 77000000 000 9620000 69 100075 000 1000000 750 48100000 3640000 28700000

70 45825 000 455580 2670 33200000 8840000 36400000 71 256320 000 2562875 325 42400000 9750000 35000000

72 33692 000 336720 201 52600000 4220000 25600000 73 155382 000 1553640 184 29500000 9220000 36300000

74 20010 000 200000 100 36000000 10000000 26700000 75 20010 000 200000 100 32300000 10000000 23000000 76 20010 000 200000 100 34100000 9980000 24400000 77 20010 000 200000 100 35200000 9970000 25700000 78 20010 000 200000 100 35500000 9970000 26200000 79 20010 000 200000 100 36000000 10000000 26700000 80 20010 000 200000 100 31000000 7520000 16500000 81 20010 000 200000 100 39200000 8530000 25800000 82 20010 000 200000 100 36300000 9600000 28000000 83 20010 000 200000 100 69700000 2460000 17200000 84 20010 000 200000 100 36000000 10000000 26700000 85 20010 000 200000 100 34200000 10000000 24800000 86 20010 000 200000 100 36000000 10000000 26700000 87 20010 000 200000 100 36000000 10000000 26700000

88 44029 000 439132 1159 35500000 10000000 26100000 89 40020 000 400000 200 35800000 10000000 26400000 90 78405 000 783891 155 32900000 9020000 23200000 91 17 000 100 070 36800000 9710000 26600000 92 17 000 100 070 36600000 9810000 26800000 93 17 000 100 070 36400000 9860000 26800000

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492
Page 81: MODELING MERCURY TRANSPORT AND TRANSFORMATION … · 2020. 6. 28. · Draft Feasibility Study (FS) being prepared by Nobis Engineering, Inc. The FS quantifies the total estimated

DRAFT

Rea

ch

Seg

men

t

Silts and OrganicSands

HgT Hg(0) Hg(II) MeHg Fines Matter(mgL)

(mgL) (mgL)

94 17 000 100 070 36300000 9880000 26700000 95 17 000 100 070 36200000 9890000 26700000 96 17 000 100 070 36200000 9900000 26700000 97 17 000 100 070 36200000 9920000 26700000 98 17 000 100 070 36400000 9870000 26800000 99 17 000 100 070 36200000 9930000 26700000 100 00 000 000 000 000 000 013 101 210326 000 2102622 641 10800000 301000 51400000

102 276195 000 2760605 1345 26200000 9330000 51300000 103 268540 000 2685070 330 34200000 15500000 37100000 104 217380 000 2173690 110 40900000 21600000 33200000

105 30020 000 300000 200 61600000 9810000 15200000 106 25790 000 257250 650 48400000 15900000 22400000

107 38320 000 381950 1250 31000000 28700000 27000000 108 8375 000 81775 1975 42600000 17400000 26700000 109 130780 000 1307730 070 45000000 15000000 26700000

110 30020 000 300000 200 44900000 14900000 26700000 111 30020 000 300000 200 45000000 15000000 26800000 112 30020 000 300000 200 50900000 17200000 25100000

113 12380 000 122560 1240 44400000 18600000 27200000 114 5270 000 50980 1720 35400000 25000000 27000000

115 35500 000 354515 485 38400000 21600000 26700000 116 30805 000 307865 185 38400000 21600000 26700000 117 30020 000 300000 200 38800000 21600000 26700000 118 30020 000 300000 200 38400000 21600000 26700000

  • TABLE OF CONTENTS
  • 1 Introduction
  • 2 Implementation of Remedial Alternatives into the Sudbury River WASP Model
  • 21 Alternative 3A Base Case (MNR)
  • 22 Alternatives 3B and 3C Enhanced Natural Recovery (Thin-layer Sand Capping)
  • 23 Alternatives 4A and 4B AquaBlok reg Capping (In situ Containment)
  • 24 Alternatives 5A 5B 5C and 5D Sediment Removal with and without Combination Capping
  • 25 Alternative 6
  • 3 Remedial Alternatives Model Output Results
  • 4 Discussion
  • 41 Remedial Alternatives
  • 42 Model Uncertainty
  • References
      1. barcodetext SDMS DocID 460492
      2. barcode 460492