technical memorandum 5: underground workings …
TRANSCRIPT
Nobis Engineering, Inc.
585 Middlesex Street
Lowell, MA 01851
T (978) 683-0891
www.nobiseng.com
Underground Workings Investigation Plan Technical Memorandum #5 Ely Copper Mine Superfund Site Operable Units 2 and 3
Vershire, Vermont Remedial Investigation / Feasibility Study EPA Task Order No. 0070-RI-CO-017L
REMEDIAL ACTION CONTRACT No. EP-S1-06-03 FOR
US Environmental Protection Agency Region 1 BY
Nobis Engineering, Inc. Nobis Project No. 80070
July 11, 2014
Nobis Engineering, Inc.
Lowell, Massachusetts
Concord, New Hampshire
Phone (800) 394-4182
www.nobisengineering.com
U.S. Environmental Protection Agency
Region 1
5 Post Office Square, Suite 100
Boston, Massachusetts 02109-3919
NH-3964-2014-D Nobis Engineering, Inc.
Nobis Engineering, Inc.
585 Middlesex Street
Lowell, MA 01851
T (978) 683-0891
www.nobiseng.com
Underground Workings Investigation Plan
Ely Copper Mine Superfund Site Operable Units 2 and 3 Vershire, Vermont Remedial Investigation / Feasibility Study EPA Task Order No. 0070-RI-CO-017L
REMEDIAL ACTION CONTRACT No. EP-S1-06-03 For US Environmental Protection Agency Region 1 By Nobis Engineering, Inc. Nobis Project No. 80070 July 2014
Andrew J. Boeckeler, P.G. Senior Project Manager
NH-3964-2014-D Nobis Engineering, Inc.
NH-3964-2014-D 1 Nobis Engineering, Inc.
ELY COPPER MINE SUPERFUND SITE
OPERABLE UNITS 2 AND 3
TECHNICAL MEMORANDUM #5
DRAFT UNDERGROUND WORKINGS INVESTIGATION PLAN
1.0 INTRODUCTION .................................................................................................... 2
2.0 BACKGROUND ..................................................................................................... 3
3.0 FIELD INVESTIGATIONS ...................................................................................... 5 3.1 Retrofit Underground Workings Boreholes for Monitoring Wells ................. 5 3.2 Underground Workings Monitoring Wells Sampling .................................... 8 3.3 Groundwater Level and Adit Discharge Monitoring ................................... 11 3.4 Underground Workings Surface Water Sampling ..................................... 12 3.5 Underground Workings Outlet/Surface Water Discharge Mapping ........... 13 3.6 Bedrock Outcrop Fracture Measurements ................................................ 13
4.0 WORK PRODUCTS ............................................................................................. 14
TABLES
NUMBER
3-1 Bedrock Borehole Details 3-2 Bedrock Monitoring Well Conversion Details 3-3 Groundwater Sampling LocationsFigures 3-4 Underground Workings Sampling and Monitoring Equipment 3-5 Monthly Monitoring Locations 3-6 Surface Water Sampling Locations
FIGURES
NUMBER
1-1 Site Locus 1-2 Site Operable Units 2-1 Site Plan 3-1 Surface Water Monitoring Locations
NH-3964-2014-D 2 Nobis Engineering, Inc.
1.0 INTRODUCTION
This Underground Workings Investigation Plan (UWIP) Technical Memorandum (Tech Memo 5)
was prepared by Nobis Engineering, Inc. (Nobis) for the United States Environmental Protection
Agency (EPA) under Contract Number EP-S1-06-03, Task Order Number 0070-RI-CO-017L
(Task Order). The Task Order objective includes the completion of a Remedial
Investigation/Feasibility Study (RI/FS) for the underground workings components of Operable
Units 2 and 3 (OU2 and OU3) of the Ely Copper Mine Superfund Site (“Site”). The UWIP
describes the technical approach for elements of Nobis’ Amendment 2 Work Plan dated May
2014.
The Site is located approximately 4 miles southeast of the village of Vershire Center and is
approximately 1.5 miles northwest of the village of West Fairlee in Orange County, Vermont. The
Site encompasses approximately 350 acres along the south slope of Dwight Hill, to the north of
Schoolhouse Brook and South Vershire Road, and the underground workings extend
approximately 3000 feet northeastward beneath the crest and north slope of Dwight Hill (Figure
1-1).
The EPA has defined the Operable Units for the Ely Copper Mine Superfund site as follows:
Operable Unit 1 (OU1): OU1 includes all mine waste piles and all associated surface water
and sediment impacts in Ely Brook, Ely Brook Tributaries, and on-site ponds.
Operable Unit 2 (OU2): OU2 includes all groundwater impacts associated with the Ely
Copper Mine Site that are within Ely Mine Forest, Inc. (EMFI) property; any surface water
impacts associated with the Underground Workings that are within the EMFI property; the
smelter and slag areas; and surface water and sediments in Schoolhouse Brook.
Operable Unit 3 (OU3): OU3 includes the underground workings and associated
groundwater and surface water impacts within the Green Crow property (i.e. north of the
crest of Dwight Hill).
The current Operable Units are shown on Figure 1-2.
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OU3 has been created, in part, to assess and address potential groundwater and surface water
(if any) impacts on Green Crow property related to the Site underground workings and associated
water pool contained within those workings (“mine pool”). The goal of the Underground Workings
RI/FS, which will address OU3 and those portions of OU2 related to the underground workings,
is to develop the minimum amount of data necessary to support the selection of a remedy that
eliminates, reduces, or controls risks to human health and the environment and that can be used
to prepare a well-supported Record of Decision (ROD).
The purpose of this UWIP is to describe the means and methods for underground workings
borehole retrofits and monitoring well construction; groundwater sampling from those retrofitted
wells; underground workings adit discharge or seep sampling and monitoring; and other field
investigations and data collection activities related to the underground workings that are included
in the Work Plan, Amendment 2 but are not covered by the project QAPP (Revision 3, November
2012). The objectives, technical approaches, and specifications for these investigation elements
are presented below.
The field investigations described herein build upon previous work performed between 2012 and
2014, as described in Nobis’ prior memoranda: “Underground Workings Field Investigation” dated
12 September 2012 (“Tech Memo 1”); “Underground Workings Bedrock Hydrogeology
Characterization” dated 15 February 2013 (“Tech Memo 2”); “Final Underground Workings
Bedrock Drilling Locations and Access Road Plan” dated 24 June 2013 (“Tech Memo 3”); and
“Phase 1 Deep Bedrock Investigation” dated January 17, 2014 (“Tech Memo 4”).
2.0 BACKGROUND
The primary objective of the OU2/OU3 field investigations described in this UWIP is to assess the
potential groundwater and surface water impacts related to the underground workings at Ely Mine.
The underground workings originate at the Main Shaft, located on property of Ely Mine Forest,
Inc. (EMFI) and plunge in the N40E direction at an angle of approximately 25 degrees, extending
beneath property of Green Crow Corporation (Green Crow). In this Tech Memo, the “up-plunge”
direction is southwest, and northeast is referred to as the “down-plunge” direction and is
topographically higher on Dwight Hill (Figure 2-1).
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Safety and logistical concerns preclude direct entry to the underground workings. Therefore, in
order to investigate groundwater impacts related to the underground workings, three boreholes
were drilled in 2013 that successfully intercepted the underground workings mine pool (Tech
Memo 4). Two boreholes (MW-UP1 and MW-UP2) are located in an up-plunge (with respect to
the underground workings) location, and one borehole (MW-DP1) is located in a down-plunge
location. All three boreholes are located on Ely Mine Forest Inc. property (Figure 2-1).
The mine pool was observed at an elevation approximately 1,276 to 1,278 feet above mean sea
level (ft amsl) when measured in 2013 by Nobis in the underground workings boreholes (Tech
Memo 4, Figure 5-1). Initial sampling and analysis of mine pool groundwater indicated metals
impacts related to the underground workings. However, because MW-DP1 is open to inflow from
flowing fractures above the mine pool, it is possible that mine pool water was mixed with
unimpacted fracture inflow during sample collection. This condition results in a degree of
uncertainty regarding the degree of impacts caused by the mine pool at this location. To address
this uncertainty, Nobis recommended the installation of a cased monitoring well in this borehole
and subsequent sampling and analysis (Tech Memo 4). Nobis also recommended that the
borehole MW-UP1 be converted to a shallow cased monitoring well to collect water quality data
from the assumed unimpacted shallow bedrock zone (Tech Memo 4).
The data collected during the underground workings field investigations described herein will be
used to help resolve the following key questions and data gaps for the OU2/OU3 Underground
Workings RI/FS.
What is the degree of metals impacts within the mine pool?
How variable is mine pool water quality with distance and depth? If there is variability in
metals concentrations or geochemical characteristics, what is the cause of the variability?
How do the underground workings and bedrock structure influence groundwater flow in
the vicinity of the mine pool?
If the mine pool is impacted, does the potential exist for these impacts to migrate beyond
the underground workings?
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At what distance (i.e. buffer zone) from the mine pool would it be reasonable to assume
that water supplies would not be impacted under realistic future-use scenarios?
Could any mine pool impacts threaten potential future drinking water sources?
How do discharges from the underground workings through seeps and adits impact
surface water?
The specific information to be collected during the investigations described herein include:
additional water quality data (i.e. metals concentrations and geochemistry) from mine pool
groundwater and underground workings surface water discharges;
seasonal variability and fluctuations of the mine pool elevations and underground workings
surface water discharges; and
bedrock outcrop lithology, fracture, and structure orientations in the vicinity of the mine
pool.
3.0 FIELD INVESTIGATIONS
Field investigations described below include planned OU2/OU3 activities associated with the
underground workings and that are not included in the QAPP (Revision 3, dated November 2012).
3.1 Retrofit Underground Workings Boreholes for Monitoring Wells
The objective of this activity is to convert the existing bedrock boreholes that intercept the
underground workings to monitoring wells that are suitable for sample collection and water level
measurement. An additional objective is to seal the wells so that they are secure when not in use
and so that air currents will not disturb bats that hibernate in the underground workings. Borehole
construction details and other observations are included in Table 3-1. Additional information
regarding the previous borehole OU2/OU3 investigations can be found in Tech Memo 4. The
proposed bedrock monitoring well conversion details are provided in Table 3-2.
This activity will include the following steps:
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Nobis’ road building and excavation subcontractor, Northwoods Excavating (Northwoods),
will improve the access road, as necessary, removing any water bars, smoothing runoff
gullies, removing fallen trees, etc. to allow the well drilling rigs to reach the existing
underground workings boreholes. Nobis will specify the technical requirements for this
work and will provide oversight of this activity.
Nobis’ drilling subcontractor, Cushing and Sons (Cushing), will mobilize the necessary
drilling rig(s) and support truck(s) to the borehole locations. Northwoods will be available
to assist pulling Cushing’s rig and trucks to the borehole locations, if needed. Nobis will
specify the technical requirements for this work and will provide oversight of this activity
MW-UP1: The objective of this monitoring well conversion is to isolate the depth interval
58 to 75 feet below ground. This monitoring location and depth interval will be used to
characterize the shallow bedrock groundwater that is inferred to be unimpacted by the
underground workings. The following procedure is planned:
o The existing locking seal will be removed.
o A cementing plug will be installed at a depth of 180 feet below ground surface (ft
bgs) by Nobis’ drilling subcontractor using the drilling rig as needed. This is
shallower than the top of the void that represents the underground workings at this
location.
o The existing 6-inch diameter borehole will be filled with bentonite-cement grout,
from the cementing plug up to 75 ft bgs, using a tremie pipe. The bentonite-
cement grout shall consist of a mixture of Portland cement (ASTM C 150),
bentonite (4 to 5 pounds of bentonite powder per 94-pound sack of cement), and
water in the proportion of not more than 7 gallons of clean approved water per bag
of cement.
o After the grout has set up (the next day following grout emplacement), sand will be
placed in the bedrock borehole up to a depth of 73 ft bgs and a two-inch diameter
PVC screen (20-slot) will be installed from 73 ft bgs to 58 ft bgs; then 2-inch PVC
pipe will be installed to the surface and approximately the same height at the
existing 6-inch steel casing.
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o The annulus between the screen and the bedrock borehole to four feet above the
screen (i.e. from 73 ft bgs to 54 ft bgs) will be filled with sand, graded appropriately
for the screen slot size. For a 20-slot screen, the sand pack should consist of
clean, well rounded quartz grains ranging in size from 0.5 to 1.0 mm (0.020 to 0.39
inches), with a uniformity coefficient of 2.5 or less. The sand will be overlain by
four feet of bentonite (from 54 to 50 ft bgs); this in turn will be overlain by bentonite-
cement grout to the surface (in the annulus), which will have the composition
described above.
o The screened interval for the newly constructed MW-UP1 will be developed until
the water is visibly clear. The well will be pumped by using a submersible pump in
accordance with the standard operating procedure (SOP) HYD-004 (QAPP). The
pump should be gently raised and lowered while pumping to allow for water
movement into and out of the sand pack. Care should be taken that the entire
length of the well screen is surged and pumped. A written record of the well
development will be kept.
When constructed as described above, this well will be suitable for sampling groundwater
from fractures above the underground workings (assuming there is sufficient flow). Also,
the well will effectively provide a seal above the air-filled portion of the underground
workings, thereby preventing air currents from the well from disturbing wintering bats in
the underground workings.
MW-UP2: No modifications will be made to this borehole, because the six-inch diameter
steel casing presently extends to the void that represents the underground workings.
When observed during video camera and borehole geophysical surveys, water levels were
within the casing but only a short distance above the bottom of the casing. Water level
measurements described below may determine whether water levels ever drop below the
bottom of the casing. This information will indicate whether a well seal is needed to
prevent air circulation that may disturb bats that winter in the air-filled portion of the
underground workings. As presently constructed, the borehole is a well that can be used
to sample the mine pool in the underground workings in the up-plunge location.
A stilling tube will be installed in MW-UP2 in order to accommodate a pressure transducer
and to allow it to remain in place during sampling, without interfering with the sampling
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pump. The stilling tube will be installed to the bottom of the boring, which is estimated at
approximately 225 ft bgs and will consist of 1-inch PVC with slots or other openings in the
bottom 5 feet to allow water entry. The stilling well will be secured to the casing so that it
does not become dislodged or impede future sampling efforts.
MW-DP1: The existing locking seal will be removed, and the borehole will be converted
to a monitoring well intended to sample the mine pool in the underground workings at this
down-plunge location while preventing inflow from shallower water-bearing zones. The
following procedure is planned:
o A 4-inch diameter Schedule 40 galvanized steel pipe will be advanced to 380 ft
bgs using a drill rig in order to place a nominal 4-inch x 6-inch Jaswell seal at this
depth.
o The Jaswell seal will be installed to 380 ft bgs and will have a nominal 4-inch x 7-
inch shale trap above the seal.
o Bentonite chips will be placed above the shale trap; these will be covered with
bentonite-cement grout, which will be emplaced in the annulus from 380 ft bgs up
to the surface using a tremie pipe.
This will result in a well that allows sampling of the mine pool with a 3-inch submersible
pump while preventing inflow from shallower bedrock fractures. Because this well will be
installed in a water-filled void, development is not necessary.
3.2 Underground Workings Monitoring Wells Sampling
As part of larger site-wide groundwater monitoring events to be performed in the summer and fall
of 2014, groundwater samples will be collected from MW-UP1, MW-UP2, and MW-DP1 and 27
other overburden and bedrock monitoring wells installed during the OU1 RI (Table 3-3). It is noted
that the sampling procedures for the OU1 monitoring wells has been provided previously in the
QAPP. Therefore, this UWIP only includes the procedures to be utilized for the sampling of MW-
UP1, MW-UP2, and MW-DP1.
Before emplacing a sampling pump or any other equipment, a manual water level measurement
will be taken using an electronic water level probe. The start and stop times for pumping will be
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recorded. This information will be used to examine transducer data from the other two wells for
evidence of possible hydraulic connections between wells. Samples will be submitted for
laboratory analysis of total and dissolved metals, sulfate, chloride, alkalinity, carbonate,
bicarbonate, hydroxide, and acidity.
Because of differences in well construction and depth, details of the sampling procedures will vary
for the three wells, as noted below. Table 3-4 includes a list of the specific equipment required to
perform sampling and water level monitoring of each of the underground workings wells.
MW-UP1: The sample will be collected from the 2-inch diameter screened interval at 58
– 73 ft bgs using a nominal two-inch Grundfos™ submersible pump. The transducer (see
Section 3.3) will be removed prior to sampling. Manual water level measurements will be
made with an electronic water level probe when the transducer is removed and again
when it is replaced. Real-time transducer water level measurements will be taken and
recorded prior to removing the transducer and after replacing the transducer. If possible,
the well will be pumped at a rate low enough to allow the water levels to stabilize. It is
noted that water level stabilization will likely not be possible, because recharge during
packer sampling in an interval from 15 – 65 ft bgs occurred at only 0.016 gallons per
minute (gpm) (Tech Memo 4). In this case, the well will be evacuated and allowed to
recharge before sample collection. Nobis will record water levels and geochemical
parameters (pH, specific conductivity, temperature, dissolved oxygen, oxidation-reduction
potential, and turbidity) every five minutes during pumping. Purge water will be discharged
to the ground surface in the vicinity of the well in a manner that does not impact the work
area. Nobis will collect the samples directly from the pump discharge hose after one hour
of pumping or after evacuation of triple the volume of water in the well plus triple the
volume of water in the tubing, whichever occurs first. It is noted that for a 2-inch well, the
volume of water is about 0.16 gallons per vertical foot.
MW-UP2: The sample will be collected from the mine pool in this 6-inch diameter well
using a 3-inch diameter submersible pump set with an intake at 205 ± 5 ft bgs. In the
event the sample cannot be collected using the submersible pump because of limited
available water and the presence of rubble in the underground workings, the sample will
be collected using a bailer. The transducer (see Section 3.3) will be removed prior to
sampling. Manual water level measurements will be made with an electronic water level
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probe when the transducer is removed and again when it is replaced. Real-time
transducer water level measurements will be taken and recorded prior to removing the
transducer and after replacing the transducer. Nobis will record water levels and
geochemical parameters (pH, specific conductivity, temperature, dissolved oxygen,
oxidation-reduction potential, and turbidity) every five minutes during pumping or at least
every 1.5 gallons during the bailing process. Purge water will be discharged to the ground
surface in the vicinity of the rig in a manner that does not impact the work area. If the
sample is pumped, Nobis will collect the samples directly from the pump discharge hose
after one hour of pumping. If the sample is bailed, Nobis will fill the sample bottles from
the bailer after a minimum of one water-filled casing volume is removed. This volume is
expected to be between 3 and 5 gallons, based on 2013 water levels (Tech Memo 4).
MW-DP1: The sample will be collected from the 4-inch diameter well casing using a 3-
inch submersible pump set with an intake at 300 ± 5 ft bgs. The transducer (see Section
3.3) will be removed prior to pump placement. Manual water level measurements will be
made with an electronic water level probe when the transducer is removed and again
when it is replaced. Real-time transducer water level measurements will be taken and
recorded prior to removing the transducer and after replacing the transducer. Nobis will
record water levels and geochemical parameters (pH, specific conductivity, temperature,
dissolved oxygen, oxidation-reduction potential, and turbidity) every five minutes during
pumping. Purge water will be discharged to the ground surface in the vicinity of the well
in a manner that does not impact the work area. Nobis will collect the samples directly
from the pump discharge hose after one hour of pumping or after evacuation of triple the
volume of water in the wellbore above the underground workings, whichever occurs first.
For the 4-inch well, the volume of water is about 0.65 gallons per vertical foot; for the 6-
inch borehole, the volume of water is about 1.5 gallons per vertical foot. If the starting
water level is 273 ft bgs, there will be about 70 gallons stored in the 4-inch casing and 6
gallons in the 6-inch borehole above the underground workings. Therefore, triple the
water in the borehole above the underground workings is approximately 228 gallons.
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3.3 Groundwater Level and Adit Discharge Monitoring
This investigation includes monthly site-wide water level monitoring events that include 40
monitoring wells, Ely Brook surface water weirs, and adit discharge locations. Table 3-5 is a
summary of the monthly monitoring locations.
Well water levels will be measured using an electronic water level probe. Measurements at the
weirs will be read from the staff gauges installed at each weir, with the water level data later
converted to discharge. Water discharge measurements from adit locations will be made using
weirs or other appurtenances to be constructed at the adits openings, as feasible. Water level
and/or flow measurements will be made using calibrated staff or volumetric gauges to be
incorporated in adit discharge appurtenances. If there is insufficient flow to feasibly measure or
if it is infeasible to construct weirs or other appurtenances at any of the adit discharge locations,
other means for measuring discharge (for example flow meter recording, visual flow observations
and manual volume estimates, or other methods) shall be used as appropriate for the particular
adit or underground workings outlet. If quantitative measurements of water level or flow are not
feasible at a given underground workings opening, qualitative descriptions of the discharge will
be recorded.
In addition to the site-wide monthly groundwater level and surface water measurements, pressure
transducers will be placed in MW-UP1, MW-UP2, MW-DP1, and one background bedrock well.
The transducers will collect continuous data for up to 13 months. For the “background well”, a
well on Dwight Hill that does not intercept the Underground Workings will be selected. The Bureau
of Mines well BOM-1 (Figure 2-1) has not been re-located in 2014. It is likely that this well was
destroyed during 2013 road building. Therefore, the next nearest accessible on-site bedrock well
will be used. This will probably be MW-19D, although this well has obstructions (presumably
rocks) that will have to be cleared by Nobis’ drilling subcontractor.
The transducers will be set to collect water level measurements once every ten minutes, but will
be re-programmed to collect water level measurements once per minute prior to the summer and
fall 2014 sampling events (except for transducers that must be removed during sampling; see
Section 3.2, above). For each well, the transducer will be selected so that its pressure rating is
the lowest (most sensitive) that can be safely emplaced in that well based on the amount of water
expected to overlie the transducer. Each transducer will be hung in the well with a communication
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cable that allows data to be downloaded from the transducer without pulling the transducer to the
surface.
The transducers will be hung at the following depths below the ground:
MW-UP1: 70 ft
MW-UP2: 205 ft
MW-DP1: 300 ft
Background well MW-19D: depth to be determined (assume 100 ft)
Non-vented transducers and non-vented cables will be used in conjunction with a barometric
pressure transducer; this will be used to correct data from the non-vented transducers for
barometric pressure effects. A mark will be placed on the transducer cable at the targeted
placement depth with respect to the well’s measurement point to provide a reference during
installation. The required cables for each well are specified in Table 3-4.
Manual water level measurements will be taken immediately before and after emplacing each
transducer and immediately before and after removing each transducer. Manual water level
measurements will also be taken from the transducer-equipped wells during each monthly event.
At the same time any manual water level measurements are taken, the “real-time” transducer
head level (i.e. the transducer reading that corresponds to the manual water level measurement)
will be downloaded and recorded. These measurements will be used to calibrate the water level
data obtained from the transducers. In addition to the real-time calibration readings, the full data
set for the preceding continuous monitoring period will be downloaded during each monthly event.
Following correction of the transducers for barometric pressure effects if necessary, the water
level data will be converted to depth below measuring point, depth bgs, and elevation above mean
sea level (amsl). The resulting water elevations will be graphed versus time for each of the wells.
3.4 Underground Workings Surface Water Sampling
As part of larger site-wide surface water monitoring events (described in the Work Plan,
Amendment 2 and the QAPP), surface water samples will be collected in spring and fall 2014
from up to six adit discharge locations (Table 3-6, Figure 3-1). Samples will be submitted for
laboratory analysis of total and dissolved metals, sulfate, chloride, alkalinity, carbonate,
bicarbonate, hydroxide, and acidity.
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Because of potential differences in the weirs or appurtenances to be constructed (as described
above in Section 3.3), details of the surface water sampling procedures may vary for the adit
locations. If possible, surface water samples will be collected in accordance with the standard
operating procedure (SOP) for surface water sampling included in the QAPP (Appendix B: SOP
SA-11).
3.5 Underground Workings Outlet/Surface Water Discharge Mapping
Nobis will locate and flag all known surface features associated with the underground workings,
including openings for mine shafts and adits. Nobis will be accompanied by a subcontracted
historical resources specialist with specific knowledge of these features. The historical specialist
will assist in locating, identifying, and interpreting the underground workings openings and other
surface features associated with the underground workings.
Each identified feature will be described and or photographed. Particular emphasis will be placed
on any outflow of water from the openings or evidence of outflow having occurred in the past.
Minor modifications may be made at sites with water flow or standing water that has exited the
outlets to allow water level or discharge measurements (as described in Section 3.3 above). Each
underground workings outlet with water discharge will be photographed.
Nobis will survey the locations of all know surface features related to the underground workings
using a Trimble™ GPS. The Trimble™ GPS will achieve the data quality objectives needed to
understand water flow that may be associated with the underground workings. The location
surveying will be done concurrently with one of the initial water level monitoring events described
above.
Also, following the monitoring well construction described above, Nobis will survey the elevations
of measuring points on the new inner casings for MW-UP1 and MW-DP1 using a laser level
referenced to established elevation benchmarks.
3.6 Bedrock Outcrop Fracture Measurements
Nobis will conduct a fracture length and intersection study at one or more bedrock outcrops near
the surface trace of the underground workings. The objectives of this investigation include
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assessing the expected lengths of fractures of various key orientations, assessing the typical
spacing between fractures, counting the number of fracture intersections that can be observed
within a given distance along a traverse or within an area of the outcrop, and improving the
conceptual site model for fracturing in the bedrock in the vicinity of the underground workings by
building on outcrop strike and dip measurements taken previously at outcrops on both EMFI and
Green Crow property.
The outcrop(s) to be selected may be the same or may be different from outcrops previously
selected for strike and dip measurements (Tech Memo 2). Outcrops will be sought with sufficiently
large exposures to lay out tape measure traverses at least several tens of feet long, in order to
intersect multiple fractures along the same traverse. Each outcrop will be described for lithology
and general aspect (pavement outcrop, cliff outcrop, hogback outcrop, etc.). The length and
orientation of each traverse will be recorded. Fractures will be counted along selected traverses,
and the lengths of individual fractures will be measured to the extent that exposures allow.
Fractures with sufficiently long traces exposed on the outcrop will be walked, with intersections
counted. Strikes and dips of fractures counted along the traverses will be measured and
recorded. The measured outcrops will be approximately located using a hand-held GPS unit.
The results will be analyzed in order to estimate the average fracture length and average fracture
spacing for key fracture sets. Counts of observed fracture intersections will also be made, and/or
the likelihood that fractures of given sets will intersect based on the length and spacing data will
be assessed. The results will be compared to similar assessments made using fracture data
obtained from acoustic televiewer logs of the underground workings boreholes.
4.0 WORK PRODUCTS
All of the field investigations described above will provide information for an updated Underground
Workings Conceptual Site Model Technical Memorandum (CSM Tech Memo). The CSM Tech
Memo will summarize the available technical data and information related to the underground
workings component of OU2/OU3 and will use the same report structure as the RI so that
information presented can be readily incorporated into the Draft RI Report. The CSM Tech Memo
will provide maps in plan-view and cross-section that depict the surveyed surface features and
inferred subsurface extent of the underground workings, including dead-end adits and shafts.
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Specific work products to be provided in the CSM Tech Memo that will be derived from the UWIP
field investigations include the following:
Retrofit Underground Workings Boreholes for Monitoring Wells:
o a summary of field activities and observations, including field notes and
photographs;
o well construction diagrams for MW-UP1, MW-UP2, and MW-DP1;
o a description of any deviations from the Work Plan, Amendment 2 and the UWIP;
o surveyed elevations of new measuring points for MW-UP1 and MW-DP1; and
o well development record for MW-UP1.
Underground Workings Monitoring Wells Sampling:
o a summary of field activities and observations, including field notes and
photographs;
o field data sampling sheets, including water levels and geochemical field parameter
measurements; and
o tabulated and validated laboratory analytical results.
Groundwater Level and Adit Discharge Monitoring:
o tabulated list of transducers used and their depths in each well, along with manual
water level calibration measurements;
o tabulated monthly water level measurement results;
o tabulated transducer results for the underground workings wells with graphs of
water elevation versus time for each of the three wells; and
o overburden groundwater potentiometric surface maps for selected months that will
be chosen to provide a representative depiction of seasonal variation;
Underground Workings Outlets and Surface Water Discharge Mapping and Surveying:
NH-3964-2014-D 16 Nobis Engineering, Inc.
o a summary of field activities and observations, including field notes and
photographs;
o revised site map showing the features identified and mapped, relocated if
necessary; and
o photo documentation of any outlets showing evidence of current or recent water
outlet flow and any features deemed to be of special interest by the historical
resources specialist.
Bedrock Outcrop Fracture Measurements:
o a summary of field activities and observations, including field notes and
photographs;
o tabulated results for fracture orientation and spacing for each traverse;
o tabulated results for fracture length measurements and fracture intersection
counts;
o a map showing the approximate locations of the bedrock outcrops;
o rose diagrams and stereonet plots showing strike and dip of fractures measured;
o a discussion comparing the 2014 outcrop study results to fracture measurements
collected during previous bedrock borehole acoustic televiewer surveys,
o a discussion regarding the implications for groundwater flow in the bedrock near
the underground workings.
T A B L E S
Table 3-1
Bedrock Borehole Details
Ely Copper Mine Superfund Site - OU2/OU3
Vershire, Vermont
Stickup
(ft) Elev. ft bgs Elev. ft bgs Elev. ft bgs Elev. ft bgs Elev. ft bgs Elev. ft bgs Elev.
MW-UP1 0.5 1476.69 11.3 1464.35 18.5 1457.15 NA NA 185.5 1290.15 NA NA 221.0 1254.65
MW-UP2* 2.0 1477.52 11.5 1463.81 201.0 1274.31 199.3 1275.92 185.0 1290.31 225.0 1250.31 350.0 1125.31
MW-DP1 2.0 1551.29 4.0 1545.18 15.0 1534.18 273.0 1276.29 384.0 1165.18 NA NA 401.0 1148.18
Notes:
ft bgs = feet below ground surface
Elev. = elevation in feet above mean sea level (MSL)
Water level in MW-UP2 and MW-DP1 measured by hand using a water level indicator on 7/19/13 and 7/25/13, respectively.
*Top of void estimate based on drilling (casing installed through void prior to borehole geophisics). Bottom of boring collapsed/obscured by rubble;
approximate total depth reachable by instruments is 211 ft bgs.
End of BoreholeTop of Static WL
Boring ID
Top of Casing Top of Bedrock Top of Void Bottom of RubbleBottom of casing
NH-3964-2014-D Nobis Engineering, Inc.
Table 3-2
Bedrock Monitoring Well Conversion Details
Ely Copper Mine Superfund Site - OU2/OU3
Vershire, Vermont
Stickup
(ft) Elev. ft bgs Elev. ft bgs Elev. ft bgs Elev.
Top (ft
bgs)
Bottom
(ft bgs)
MW-UP1 0.5 1476.69 18.5 1457.15 185.5 1290.15 221.0 1254.65
PVC monitoring
well 2" 73 58.0 73.0
MW-UP2* 2.0 1477.52 201.0 1274.31 185.0 1290.31 350.0 1125.31 PVC stilling well 1" 205
MW-DP1 2.0 1551.29 15.0 1534.18 384.0 1165.18 401.0 1148.18
Jaswell Seal and
steel monitoring
well 4" 380
Notes:
ft bgs = feet below ground surface
Elev. = elevation in feet above mean sea level (MSL)
approximate total depth reachable by instruments is 211 ft bgs.
Boring ID
Top of Casing Top of Void Screened IntervalBottom of casing
Open at 380
Open at 225
End of Borehole
Well Type Well IDWell
Depth (ft)
*Top of void estimate based on drilling (casing installed through void prior to borehole geophisics). Bottom of boring collapsed/obscured by rubble;
NH-3964-2014-D Nobis Engineering, Inc.
Table 3-3
Groundwater Sampling Locations
Ely Copper Mine Superfund Site OU2/OU3
Vershire, Vermont
Page 1 of 1
MW-01C Shallow Bedrock Smelter/Slag X X X No exceedances of PRGs, near by to MW-02 couplet
MW-02A Shallow Overburden Smelter/Slag X X X Assess impacted groundwater in the slag area
MW-02B Deep Overburden Smelter/Slag X X X Assess impacted groundwater in the slag area
MW-02C Shallow Bedrock Smelter/Slag X X X Assess impacted groundwater in the slag area
MW-05A Shallow Overburden UWA X X X Assess groundwater impacts to tramway/UWA erosion area
MW-05B Deep Overburden UWA X X X Assess groundwater impacts to tramway/UWA erosion area
MW-05C Shallow Bedrock UWA X X X Assess groundwater impacts to tramway/UWA erosion area
MW-08A Shallow Overburden UWA X X X Assess impacted groundwater in Pond 4 & 5 area
MW-09A Shallow Overburden UWA X X X Assess the impacts from UWA on non-waste areas
MW-09C Shallow Bedrock UWA X X X Assess the impacts from UWA on non-waste areas
MW-11A Shallow Overburden Smelter/Slag X X X Assess groundwater impact in the smelter area
MW-11C Shallow Bedrock Smelter/Slag X X X Assess groundwater impact in the smelter area
MW-12C Shallow Bedrock UWA X X X Assess impacted groundwater in Pond 4 & 5 area
MW-13A Shallow Overburden UWA X X X Provide data near access road/UWA buffer zone
MW-14A Shallow Overburden EB-LR X X X Assess groundwater impacts outside of the boundary of EB-LR floodplain
MW-14C Shallow Bedrock EB-LR X X X Assess groundwater impacts outside of the boundary of EB-LR floodplain
MW-14D Deep Bedrock EB-LR X X X Assess groundwater impacts outside of the boundary of EB-LR floodplain
MW-15A Shallow Overburden EB-TZ X X X Assess groundwater impacts west of EB-MR
MW-18A Shallow Overburden UWA X X X Historically dry location; however, if water is present a sample should be collected due to lack of data points for the location
MW-19A Shallow Overburden UWA X X X Only location with consistent data in the UWA
MW-19C Shallow Bedrock UWA X X X Only location with consistent data in the UWA
MW-19D Deep Bedrock UWA Well is damaged with an obstruction at about 30 feet bgs. In the event the can be repaired, sampling will be re-evaluated.
MW-20A Shallow Overburden LWA X X X Assess the impacts of the LWA on non-waste area
MW-20C Shallow Bedrock LWA X X X Assess the impacts of the LWA on non-waste area
MW-20D Deep Bedrock LWA X X X Assess the impacts of the LWA on non-waste area
MW-21A Shallow Overburden LWA X X X Represents the core of the LWA
MW-21C Shallow Bedrock LWA X X X Represents the core of the LWA
MW-22A Shallow Overburden Tailing X X X Only location within the TA
MW-DP1 Deep Bedrock BMW X X X Target of investigation to determine potential impacts from mine pool
MW-UP1 Deep Bedrock BMW X X X Target of investigation to determine potential impacts from mine pool
MW-UP2 Deep Bedrock BMW X X X Target of investigation to determine potential impacts from mine pool
Total Wells Monitored: 30 30 30
Notes
1. EB-LR = Ely Brook-Lower Reach; EB-TZ = Ely Brook-Transition Zone; ORB = Ore Roast Bed
LWA = Lower Waste Area; UWA = Upper Waste Area; WC = West Cell; BMW = Bedrock Mine Workngs
2. PRG = Preliminary Remediation Goal; AES = Atomic Emission Spectroscopy; MS = Mass Spectrometer
3. "Other Inorganics" = sulfate, chloride, alkalinity, carbonate, bicarbonate, an acidity.
Well NumberTotal
MetalsRationale for SamplingAquifer Area
Dissolved
Metals
Other
Inorganics 3
Nobis Engineering, Inc.
Table 3-4
Underground Workings Sampling and Monitoring Equipment
Ely Copper Mine Superfund Site OU2/OU2
Vershire, Vermont
Groundwater Sampling
Item Required for Well Manufacturer Model Performance Specification Power Requirements Comments
Pumps, Controls, and Power
Nominal 3-Inch Submersible Pump MW-UP2, MW-DP1 10SQ330230 V; rated at 3-15 gpm; 1.5HP; pump curve suggests 10 - 12 gpm at water depth of 280 ft;
flow will decrease as water level drops -- may be 6 gpm or less at 380 ftGenerator For cables, assume sample depth 300 ft for DP1,plus 10 ft = 310 ft;
Nominal 2-Inch Submersible Pump MW-UP1 pump curve output = 8 gpm at 75 ft head;220 V; 0.5HP; 400Hz; For cable, assume sample depth 70 ft plus 10 ft = 80 ft;
2" Submersible Pump Control Box MW-UP1 100 ml/min to 9 gpm; pump has interconnect cable for voltage conversion
Generator MW-UP1, MW-UP2, MW-DP1 Generac GP5500 5000 W; has 200-240V output and 100-115V output Gasoline
MW-UP1 83 ft; 3/8 inch clear polyethylene For tubing, assume sample depth 73 ft, plus 10 ft;
MW-UP2 215 ft; 1 inch black polythylene For tubing, assume sample depth 205 ft, plus 10 ft;
MW-DP1 310 ft; 1 inch black polythylene For tubing, assume sample depth 300 ft, plus 10 ft;
Other fitings and/or adaptors MW-UP1, MW-UP2, MW-DP1 plastic "transducer savers" on rim of well N/A
Monitoring and Sampling Field Measurement Meters
Water level meter MW-UP1, MW-UP2, MW-DP1 Solinst 101 - 300' 300'; also may need extra weight to get probe down the deviated borehole in DP1 Battery
Pressure Transducer and Barometric Data Reader MW-UP1, MW-UP2, MW-DP1 In Situ Rugged Reader 520 MHz with comm cable; Optional -- can use laptop Battery
Laptop Computer MW-UP1, MW-UP2, MW-DP1 Not required if using Rugged Reader; also need comm cable Battery
Multi-parameter water quality meter YSI 600XL MPS w/ Flow Cell
Turbidity meter Hach 2100P
Peristaltic pump with battery/charge GeoPump Battery pack
Filter MW-UP1, MW-UP2, MW-DP1 .45 micron N/A
Monthly Water Level Monitoring
Item Manufacturer Model Performance or Other Specifications Power Requirements Comments
Water level meter MW-UP1, MW-UP2, MW-DP1 Solinst 101 - 300' 300' Batterymay need extra weight to get probe down the deviated borehole
in DP1
Pressure Transducer and Barometeric Data Reader MW-UP1, MW-UP2, MW-DP1 in Situ Rugged Reader 520 MHz with comm cable; Optional -- can use laptop Battery
Laptop Computer MW-UP1, MW-UP2, MW-DP1 Not required if using a Rugged Reader; also need comm cable Self-charging
Continuous Water Level Monitoring
Item Manufacturer Model Performance Specification Power Requirements Comments
MW-UP1, MW-UP2, MW-19D In Situ99240 Level Troll 400, 30
psiaLevel sensor range 11 m (35 ft); unvented
MW-DP1 In Situ99250 Level Troll 400,
100 psiaLevel sensor range 60 m (197 ft); unvented
MW-UP1 52000-03-01-02 Rugged twist-lock cable, poly, non-vented, no reel; max 100 ft; need 75 ft
MW-DP1 52000-03-03-02 Rugged twist-lock cable, poly, non-vented, small spool; max 900 ft; need 300 ft
Barometric data logger NA In Situ 89100 Baro Troll 1.14 bar ( 16.5 psi); requires backshell or cable Deploy in convenient location near wells
Pressure Transducer and Barometric Data Reader In Situ Rugged Reader 520 MHz with comm cable; Optional -- can use laptop
Laptop Computer Must have if not using Rugged Reader; also need comm cable Self-charging
All Wells
Tubing
MW-UP2, Background Well
MW-UP1, MW-UP2, MW-DP1Or equivalent; Also need Solution Zero Oxygen; Solution-Zobell;
and Solution .447s ConductivitySpecified in QAPP SOP SA-003
Self-charging
Use laptop or Rugged Reader; need comm cable either way; Win
Situ software will come with purchase or rental
Use laptop or Rugged Reader; need comm cable either way; Win
Situ software will come with purchase or rental
BatteryPressure Transducers
Data cables
Use laptop or Rugged Reader; need comm cable either way; Win
Situ software will come with purchase or rental
Battery
Not specified
Generator
N/A
In Situ 52000-03-02-02 Rugged twist-lock cable, poly, non-vented, small spool; max 500 ft; need 210 ft N/A
Grundfos
Redi-Flo2
Not specified
Not specified
Not specified
Not specified
NH-3964-2014-D Nobis Engineering, Inc.
Table 3-5
Monthly Monitoring Locations
Ely Copper Mine Superfund Site OU2/OU3
Vershire, Vermont
Page 1 of 2
1834 Tyson/1854 Pollard Adit UMW UMW X X X Determine if flow is emanating from underground mine working
1850 Pollard Adit UMW UMW X X X Determine if flow is emanating from underground mine working
1861 Pollard Adit UMW UMW X X X Determine if flow is emanating from underground mine working
Deep Adit UMW UMW X X X Determine if flow is emanating from underground mine working
Main Adit UMW UMW X X X Determine if flow is emanating from underground mine working
Shaft #4 UMW UMW X X X Determine if flow is emanating from underground mine working
SW above Main Adit Surface Water UMW X X X Determine if surface water is contributing to Main Adit water
FS-01 Surface Water EB-UR X X X X Assess surface water flow from EB-UR
FS-02 Surface Water EBT3 X X X X Assess surface water flow from EBT3
FS-03 Surface Water EBT2 X X X X Assess surface water flow from Pond 5 discharge
FS-04 Surface Water EBT2 X X X X Assess surface water flow upstream of EB-MR confluence and downstream of EBT3 confluence
FS-05 Surface Water EB-LR X X X X Assess surface water flow downstream from EBT2 confluence
BOM-01 Bedrock UWA X Monitor site-wide groundwater elevations
BOM-03 Bedrock UWA X Monitor site-wide groundwater elevations
MW-01A Shallow Overburden Smelter/Slag X Monitor site-wide groundwater elevations
MW-01B Deep Overburden Smelter/Slag X Monitor site-wide groundwater elevations
MW-01C Shallow Bedrock Smelter/Slag X Monitor site-wide groundwater elevations
MW-02A Shallow Overburden Smelter/Slag X Monitor site-wide groundwater elevations
MW-02B Deep Overburden Smelter/Slag X Monitor site-wide groundwater elevations
MW-02C Shallow Bedrock Smelter/Slag X Monitor site-wide groundwater elevations
MW-03C Shallow Bedrock ORB X Monitor site-wide groundwater elevations
MW-04A Shallow Overburden LWA X Monitor site-wide groundwater elevations
MW-04C Shallow Bedrock LWA X Monitor site-wide groundwater elevations
MW-05A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-05B Deep Overburden UWA X Monitor site-wide groundwater elevations
MW-05C Shallow Bedrock UWA X Monitor site-wide groundwater elevations
MW-06A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-06C Shallow Bedrock UWA X Monitor site-wide groundwater elevations
MW-07A Shallow Overburden Background X Monitor site-wide groundwater elevations
MW-07C Shallow Bedrock Background X Monitor site-wide groundwater elevations
MW-08A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-09A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-09C Shallow Bedrock UWA X Monitor site-wide groundwater elevations
MW-10B Deep Overburden Smelter/Slag X Monitor site-wide groundwater elevations
MW-10C Shallow Bedrock Smelter/Slag X Monitor site-wide groundwater elevations
MW-11A Shallow Overburden Smelter/Slag X Monitor site-wide groundwater elevations
MW-11C Shallow Bedrock Smelter/Slag X Monitor site-wide groundwater elevations
MW-12C Shallow Bedrock UWA X Monitor site-wide groundwater elevations
MW-13A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-14A Shallow Overburden EB-LR X Monitor site-wide groundwater elevations
MW-14C Shallow Bedrock EB-LR X Monitor site-wide groundwater elevations
MW-14D Deep Bedrock EB-LR X Monitor site-wide groundwater elevations
AquiferFlow
VelocityFlow Rate Rationale for SamplingMonitoring Location
Presence
of Flow
Water
LevelArea
NH-3964-2014-D Nobis Engineering, Inc.
Table 3-5
Monthly Monitoring Locations
Ely Copper Mine Superfund Site OU2/OU3
Vershire, Vermont
Page 2 of 2
AquiferFlow
VelocityFlow Rate Rationale for SamplingMonitoring Location
Presence
of Flow
Water
LevelArea
MW-15A Shallow Overburden EB-TZ X Monitor site-wide groundwater elevations
MW-16A Shallow Overburden EB-TZ X Monitor site-wide groundwater elevations
MW-17A Shallow Overburden LWA X Monitor site-wide groundwater elevations
MW-18A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-19A Shallow Overburden UWA X Monitor site-wide groundwater elevations
MW-19C Shallow Bedrock UWA X Monitor site-wide groundwater elevations
MW-19D Deep Bedrock UWA X Monitor site-wide groundwater elevations
MW-20A Shallow Overburden LWA X Monitor site-wide groundwater elevations
MW-20C Shallow Bedrock LWA X Monitor site-wide groundwater elevations
MW-20D Deep Bedrock LWA X Monitor site-wide groundwater elevations
MW-21A Shallow Overburden LWA X Monitor site-wide groundwater elevations
MW-21C Shallow Bedrock LWA X Monitor site-wide groundwater elevations
MW-22A Shallow Overburden Tailing X Monitor site-wide groundwater elevations
MW-23A Shallow Overburden ORB X Monitor site-wide groundwater elevations
MW-24B Deep Overburden WC X Monitor site-wide groundwater elevations
MW-24C Shallow Bedrock WC X Monitor site-wide groundwater elevations
MW-25B Deep Overburden WC X Monitor site-wide groundwater elevations
MW-25C Shallow Bedrock WC X Monitor site-wide groundwater elevations
MW-26B Deep Overburden WC X Monitor site-wide groundwater elevations
MW-26C Shallow Bedrock WC X Monitor site-wide groundwater elevations
MW-DP1 Deep Bedrock BMW X Monitor site-wide groundwater elevations
MW-UP1 Deep Bedrock BMW X Monitor site-wide groundwater elevations
MW-UP2 Deep Bedrock BMW X Monitor site-wide groundwater elevations
TP-228-PZ Shallow Overburden WC X Monitor site-wide groundwater elevations
TP-230-PZ Shallow Overburden WC X Monitor site-wide groundwater elevations
SB-103 Deep Overburden ORB X Monitor site-wide groundwater elevations
SB-104 Deep Overburden ORB X Monitor site-wide groundwater elevations
SB-105 Deep Overburden ORB X Monitor site-wide groundwater elevations
Total Locations Monitored: 63 12 12 12
Notes
EB-LR = Ely Brook-Lower Reach; ORB = Ore Roast Bed; EB-TZ = Ely Brook-Transition Zone;
LWA = Lower Waste Area; UMW = Underground Mine Workings; UWA = Upper Waste Area;
BMW = Bedrock Mine Workngs; WC = West Cell;
NH-3964-2014-D Nobis Engineering, Inc.
Table 3-6
Surface Water Sampling Locations
Ely Copper Mine Superfund Site OU2/OU3
Vershire, Vermont
Page 1 of 1
EM-POND4 Pond 4 x x x Assess impacts to pond
EM-POND5 Pond 5 x x x Assess impacts to pond
ES-4 Seep 4/1850 Pollard Adit x x x Potential leaching from adit discharge
ES-8 Seep 8/Deep Adit x x x Potential leaching from adit discharge
SW-06 SHB x x x Assess impacts downstream of Ely Brook-Schoolhouse Brook confluence
SW-12 EB-MR x x x Assess impacts downstream of EBT2 confluence
SW-13 EB-UR x x x Assess impacts upstream of EBT3 confluence
SW-14 EBT2 x x x Assess impacts upstream of EBT2 confluence
SW-17 EB-UR x x x Assess impacts upstream of EB-UR confluence
SW-29 EBT4 x x x Assess impacts upstream of EBT4 confluence
SW-32 EBT2 x x x Assess impacts upstream of EB-MR confluence and downstream of EBT3 confluence
SW-34 EBT1 x x x Assess impacts upstream of EB-LR confluence
SW-39 EB-LR x x x Assess impacts downstream of EBT1 confluence
SW-40 EB-UR x x x Assess impacts downstream of EBT4 confluence
SW-42 Seep 14/Ponds 4 and 5 x x x Assess impacts of drainage potentially discharging to ponds
SW-60 EBT3 x x x Assess impacts upstream of EBT2 confluence
SW-76 UWA x x x Assess impacts from seepage from UWA waste pile
SW-82 EBT3 x x x Assess impacts upstream of tailing area
SW-100 Main Adit x x x Main adit discharge
SW-101 SW above Main Adit x x x Surface water directly above main adit that may be contricuting to water in the adit
Total Locations Monitored: 20 20 20
Notes
1. EB-LR = Ely Brook-Lower Reach; UWA = Upper Waste Area; EBT# = Ely Brook tributary with identifying number; SHB = Schoolhouse Brook
2. SW = Surface Water; AES = Atomic Emission Spectroscopy; MS = Mass Spectrometer
Sample LocationDissolved
Metals
Total
MetalsRationale for SamplingArea Sulfate
Nobis Engineering, Inc.
F I G U R E S
³ APPROXIMATE SCALE
Revision No. 00
Drawn By: JRS Checked By: AJB FIGURE 1-1
0 800 1,600400Feet
August 2012
Quadrangle LocationSite Locus
Ely Copper MineVershire, Vermont
USGS TOPOGRAPHIC MAP
VERSHIRE, VERMONT1981; (Photo-inspected 1983)
Ely Copper MineStudy Area
Ely Copper MineSuperfund Site
Schoolhouse Brook
South Vershire Road
Beanville Road
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Nobis Engineering, Inc.18 Chenell Drive
Concord, NH 03301(603) 224-4182
Vershire
West Fairlee
Underground Workings OU2
General Extent of the Ely Copper Mine Superfund Site
Schoolhouse Brook
South Vershire Road
Beanville Road
LegendRoad
General Extent of the Ely Copper Mine Superfund Site
OU1 Area
OU2 Area
OU3 Area
Underground Mine Working
Waste Area
Property Boundary
East Branch of theOmpompanoosuc River
Route 113
³ APPROXIMATE SCALE
Revision No. 01
Drawn By: DWG Checked By: AJB Figure 1-2
0 1,500 3,000750Feet
June 2014Nobis Engineering, Inc.
18 Chenell DriveConcord, NH 03301
(603) 224-4182
Site Operable Units
1 inch = 1,500 feet
XY
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POND 2POND 3
POND 4
POND 5
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EBT2E B T 5
South Vershire Road
Air Vent
Deep Adit
Main Adit
Main Shaft
Burleigh Shaft
1850 Pollard Adit
1850s Pollard Shaft
Back Stopes Entrance
1834 Tyson/1854 Pollard Adit
Unidentified Rock-Walled Hole
Shaft II - 1850s Pollard Shaft
MW-DP1
MW-UP1MW-UP2
MW-9CMW-9A
MW-8A
MW-7CMW-7A
MW-6CMW-6A
MW-5CMW-5BMW-5A
MW-4CMW-4A
MW-3C
MW-2CMW-2BMW-2A
MW-1CMW-1BMW-1A
MW-23A
MW-22A
MW-21CMW-21A
MW-20DMW-20CMW-20A
MW-19DMW-19C
MW-19A
MW-18A
MW-17A
MW-16A
MW-15A
MW-14DMW-14CMW-14A
MW-13A
MW-12C
MW-11CMW-11A
MW-10CMW-10B
MW-26CMW-26B
MW-25CMW-25B
MW-24CMW-24B
BOM-03
BOM-01
1300
1250
1100
1150
1200
1350
1050
1400
1450
1500
1000
1550
1600
1450
1350
1050
1100
1500
Legend!A Bureau of Mines Monitoring Well
!A Monitoring Well
!A OU2 Phase I Borehole
XY Adit
ð Shaft
Property Boundary
Gravel Road
Paved Road
Trail
Treeline
Stream
Pond
Topographic Contour
³ APPROXIMATE SCALE
Revision No. 00
Drawn By: DWG Checked By: AJB
300 0 300150
June 2014
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FIGURE 2-1
Nobis Engineering, Inc.18 Chenell Drive
Concord, NH 03301(603) 224-4182
Site PlanEly Copper Mine
Vershire, Vermont
0
0
0
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ES-8
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SW-60
SW-13
SW-42
SW-76
SW-82
SW-06
SW-14
SW-40
SW-29
SW-32SW-12
SW-34
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SW-39
SW-101SW-100
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FS-05
FS-04
FS-03FS-02
FS-01
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Unidentified Rock-Walled Hole
1834 Tyson/1854 Pollard Adit
Back Stopes Entrance
1850s Pollard Adit A
Main ShaftAir Vent
Main Adit
1850 Pollard Adit
Deep Adit
Burleigh Shaft
1850s Pollard Shaft
Shaft #4
³ APPROXIMATE SCALERevision No. 01
Drawn By: DWG Checked By: AJB
0 300 600150Feet
July 2014 Nobis Engineering, Inc.18 Chenell Drive
Concord, NH 03301(603) 224-4182
Sur face WaterMonitoring Locat ions
Ely Copper MineVersh ire, VermontPa
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ð Shaft0 Surface Water Sample Location( Surface Water Weir
Property BoundaryGravel RoadPaved RoadTrailTreelineStreamPondUnderground Mine Workings
FIGURE 3-1