soil excavation report 12.2010 · the objective of phase i of the cap (soil excavation) was to...

GROUNDWATER MONITORING AND

SOIL EXCAVATION CORRECTIVE ACTION REPORT

Richford Sunoco 73 Main Street

Richford, Vermont

VTDEC Site #88-0218 KAS Project #410040057

December 20, 2010

Prepared For:

A.R. Sandri, Inc. P.O. Box 1578

Greenfield, MA 01302

Prepared by

P.O. Box 787 / 368 Avenue D, Suite 15 Williston, Vermont 05495

(802) 383-0486 (ph) (802) 383-0490 (fax)

www.kas-consulting.com

Groundwater Monitoring and Soil Excavation Corrective Action Report Richford Sunoco, Richford, VT

12/20/2010 VTDEC Site #88-0218 i

EXECUTIVE SUMMARY A groundwater monitoring and soil excavation corrective action report has been completed for the Richford Sunoco property located at 73 Main Street in Richford, Vermont. This work was conducted in accordance with the Corrective Action Plan (CAP) dated July 1, 2010 and revised September 17, 2010. The CAP was approved by Mrs. Lynda Provencher of the Vermont Department of Environmental Conservation (VTDEC) in a letter to A.R. Sandri, Inc. dated October 7, 2010. Work conducted at the Site pursuant to Phase I of the CAP included waste characterization sampling, soil excavation and backfilling, soil transport and disposal, replacement well installation, and the collection and laboratory analysis of groundwater samples from the on-site monitoring wells. The objective of Phase I of the CAP (soil excavation) was to remove gross contamination and eliminate the continued presence of light non-aqueous phase liquid (LNAPL) in the vicinity of monitoring well MW08-25 while also reducing the adsorbed and dissolved phase concentrations downgradient of the Site. Approximately 965 tons or 643 yd3 of petroleum impacted soils were excavated and loaded onto dump trailers and transported by various carriers to New England Waste Services of Vermont landfill in Coventry, Vermont from October 27 to November 1, 2010. KAS supervised the installation of five, two-inch diameter replacement monitoring wells (MW-6R, MW-7R, MW-22R, MW-23R, and MW-25) at the site on November 9, 2010. The replacement wells were drilled and installed in approximately the same locations as MW-6, MW-7, MW08-22, MW08-23, and MW08-25. Groundwater samples were collected from monitoring wells MW-6R, MW-7R, MW-9, MW-13, MW-18, MW-22R, MW-23R, and MW-25R on November 18, 2010. No LNAPL was measured or observed in these monitoring wells on this date. Select compounds were reported at a concentration exceeding the VGES in the sample collected from all of the wells except MW-18 on November 18, 2010. The total reduction in the VOCs in groundwater collected from the replacement monitoring wells ranged from 0.0% to 88% as compared to the established baseline concentrations. The total VOCs reported in replacement monitoring wells MW-7R, MW-22R, MW-23R, and MW-25R are at the lowest concentration reported to date for these sampling locations. Based on the results of excavation and groundwater monitoring conducted at this site, the objectives of Phase I of the corrective action -- to remove gross contamination and eliminate the continued presence of LNAPL in the vicinity of monitoring well MW08-25 (replacement well MW-25R) while also reducing adsorbed and dissolved phase contaminant concentrations downgradient of the Site – have been successfully achieved, and at a greater rate than natural attenuation and manual LNAPL recovery alone. To continue to track the anticipated declined in dissolved phase contamination; a groundwater monitoring event should be performed in February 2011 in accordance with the schedule presented in the CAP.


12/20/2010 VTDEC Site #88-0218 ii

TABLE OF CONTENTS

1.0 INTRODUCTION .......................................................................................... 1

2.0 SITE BACKGROUND..................................................................................... 1

3.0 CORRECTIVE ACTION.................................................................................. 2

3.1 WASTE CHARACTERIZATION SAMPLING ......................................................................2 3.2 EXCAVATION AND BACKFILLING................................................................................2 3.3 SOIL TRANSPORT.................................................................................................5 3.4 REPLACEMENT WELL INSTALLATION ..........................................................................5

4.0 GROUNDWATER FLOW DIRECTION AND GRADIENT .................................. 5

5.0 GROUNDWATER SAMPLING AND ANALYSES .............................................. 6

5.1 ANALYTICAL RESULTS ...........................................................................................6 5.2 QUALITY ASSURANCE AND CONTROL SAMPLING AND ANALYSIS..........................................7 5.3 TREND ANALYSIS .................................................................................................7

6.0 CONCLUSIONS............................................................................................. 8

7.0 RECOMMENDATIONS .................................................................................. 9

APPENDIX A - Site Location Map Site Map w/ Excavation Area Groundwater Contour Map Contaminant Distribution Map APPENIDX B - Excavation Sketch with Sample Locations Soil Screening Results Site Photographs APPENDIX C - Waste Characterization Data

Groundwater Quality Data Laboratory Analytical Reports

APPENDIX D - Soil Boring Log and Monitoring Well Construction Diagram APPENDIX E - Liquid Level Monitoring Data APPENDIX F - Bill of Lading Sheets


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1.0 INTRODUCTION This groundwater monitoring and soil excavation corrective action report has been completed for the Richford Sunoco property located at 73 Main Street in Richford, Vermont (see Site Location Map in Appendix A). This work was conducted in accordance with the Corrective Action Plan (CAP) dated July 1, 2010 and revised September 17, 2010. The CAP was approved by Mrs. Lynda Provencher of the Vermont Department of Environmental Conservation (VTDEC) in a letter to A.R. Sandri, Inc. dated October 7, 2010.

The objective of Phase I of the CAP (soil excavation) is to remove gross contamination and eliminate the continued presence of light non-aqueous phase liquid (LNAPL) in the vicinity of monitoring well MW08-25. Another objective is to reduce the dissolved and adsorbed concentrations of petroleum compounds in the subsurface downgradient of the former USTs and pump island.

Work conducted at the Site pursuant to Phase I of the CAP included waste characterization sampling, soil excavation and backfilling, soil transport and disposal, replacement well installation, and the collection and laboratory analysis of groundwater samples from the on-site monitoring wells.

2.0 SITE BACKGROUND Petroleum contamination was first detected at the Richford Sunoco station in July of 1988, when free phase gasoline was observed on groundwater which filled into an excavation for installation of a canopy over the pump islands. Subsurface petroleum contamination was attributed to a release of gasoline from a former underground storage tank (UST). Previous site work and remedial action was conducted by other consultants after the discovery of the free phase gasoline in 1988.

Contamination levels at the site were monitored periodically following the installation of monitoring wells and levels were found above Vermont Groundwater Enforcement Standards (VGES). A soil vapor extraction (SVE) system was installed at the Site in September 1994 and operated until October 1999. The SVE system removed an equivalent of approximately 770 gallons of gasoline from the subsurface. Initially, the monitoring wells were used as free product recovery wells prior to them being used for groundwater sampling.

Since groundwater sampling began, the petroleum contamination concentrations in the monitoring wells have remained relatively stable at elevated levels, and it appears natural attenuation is not occurring at a fast enough rate. During the sampling events, it was observed that the groundwater at the site flows north towards a section of the Missisquoi River.

In July 2008, a supplemental site investigation was conducted at the site to further assess the degree and extent of petroleum impact to soil and groundwater in the vicinity of the Richford Sunoco and down gradient along Main Street. Twenty six soil borings, four completed as monitoring wells MW08-22 through MW08-25, were advanced at the Site on July 22 and 23, 2008 by T&K Drilling of Troy, New Hampshire. During this investigation,


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elevated PID readings were observed in the soil samples collected from several of the soil borings ranging from 89.0 to 881 parts per million (ppm). A petroleum odor distinctive of gasoline was noted in several soil samples collected on July 22 and 23, 2008.

A Corrective Action Feasibility Investigation (CAFI) was conducted in the winter 2009 by KAS. The remedial alternatives examined as part of the CAFI were soil vapor extraction, soil vapor extraction with air sparging, Matrix™ Oxygen Injection, Matrix™ Oxygen Injection with soil vapor extraction, soil excavation, oxygen-release compound, pump and treat, and an interception trench. Based on a review of the above alternatives, direct-push injection of RegenOxTM in conjunction with soil excavation was determined to be the best remedial approach1. In a meeting between KAS and the VTDEC on September 9, 2010 the proposed use of chemical oxidation was removed due to the uncertainty of its performance of cleaning up the downgradient portion of the contaminant plume. A revised CAP was prepared by KAS and submitted to the VTDEC in September 2010.

Copies of the summary reports of prior work are on file at the offices of the DEC in Waterbury, Vermont.

3.0 CORRECTIVE ACTION

3.1 Waste Characterization Sampling On October 11, 2010, KAS collected three waste characterization soil samples from boreholes advanced by a geoprobe drill rig within the proposed excavation outline. The samples were analyzed for total petroleum hydrocarbons (TPH) via EPA Method 8015B gasoline range organics (DRO), volatile organic compounds (VOCs) via EPA Method 8260B, total lead, and ignitability. A total of three borings (SC-1 through SC-3) were advanced within the excavation area by T&K Drilling of Troy, New Hampshire, under the direct supervision of a KAS scientist. Soils were screened using a MiniRae Classic photoionization detector (PID) equipped with a 10.6 eV bulb. PID readings in soil samples collected from the three soil borings ranged from 0.5 to 2,163 ppm. All three of the soil borings hit bedrock refusal at a depth ranging from approximately 5-8 feet below grade.

Grab soil samples were collected from soil borings SC-1 through SC-3 at saturated depths ranging from 4-8 feet below grade. The petroleum-impacted soils met the criteria set forth by Casella Waste Management for disposal at the New England Waste Services of Vermont landfill in Coventry, Vermont. A tabular summary of the waste characterization data is included in Appendix C. The waste characterization sample analytical report is also included in Appendix C.

3.2 Excavation and Backfilling KAS supervised the excavation and loading of a reported 964.73 tons or 643 yd3 of petroleum contaminated soils from October 27 to November 1, 2010 at and in the vicinity of the Richford Sunoco site. FPH Tank Installation & Service (FPH) of Orleans, Vermont, excavated and loaded the soils. Some of the excavated soils were temporarily and securely

1 KAS, Inc. July 2009, revised October 2009. Corrective Action Feasibility Investigation Report.


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stored on-site on and under 6 mil polyethylene sheeting on October 27, 2010 while the remaining excavated soil was live loaded into dump trailers (see Section 3.3).

During the excavation, petroleum-impacted soils were segregated from “clean” soils with a MiniRae Classic PID equipped with a 10.6 eV bulb. Soils that were not impacted by petroleum above 20 parts per million volume (ppmv) were staged near the excavation for later backfilling. A total of 83 soil samples were collected from the excavation area for soil screening. A table of soil screening results is included in Appendix B.

Soils were excavated to bedrock depth ranging from approximately 3.5-9 feet below grade over the entire area of the excavation. Upon removal of the asphalt the soils were screened with the PID. Readings in the top 2 feet of soil were generally below 20 ppm thus the 2 feet were removed and placed aside as clean material. At approximately 2 feet below grade, PID readings increased and were measured as high as 207 ppm. Therefore all soils within the excavation area from 2 feet below grade and beyond were dug out and disposed of. Saturated soils were encountered at approximately 3-5 feet below grade; however, a significant amount of groundwater did not accumulate within the excavation. PID readings within the saturated zone were measured to be as high as 2,410 ppm and several areas of heavy black stained soils were encountered. As much soil as possible, exhibiting PID readings above 20 ppm, was removed from the excavation area.

The vertical extent of soil excavation was limited by the presence of bedrock throughout the excavation. The horizontal extent of soil excavation was limited to the south by the presence of the existing on site pump dispensers and canopy and to the west by the presence of Route 105. The excavation extended as far out into Main Street as possible without compromising traffic. The excavation extended as far to the south as possible without compromising the pump dispensers and canopy. A significant amount of contaminated soil remained in the subsurface especially on the south and west wall of the excavation. PID readings as high as 1,770 ppm and 860 were measured in the remaining soil along the southern and western wall of the excavation; respectively.

Excavation of contaminated material began along the concrete wall that separates the Sunoco property with the neighboring Albarelli property (61 Main Street). This concrete wall was noted to extend vertically to bedrock depth and was in excellent structural condition; therefore, the wall was not disturbed and was left in place during the excavation activities. PID readings in soils collected along the southern edge of this wall ranged from 4.2 to 186 ppm. PID readings in soils collected on the northern edge of the wall were generally lower and ranged from 0.3 to 58.4 ppm. An approximate 5-10 foot strip of soil was present between the concrete wall and the neighboring Albarelli building. This soil was excavated and all soil exhibiting PID readings above 20 ppm was removed for disposal in this area. As the excavation progressed towards the Albarelli building hand digging was conducted to prevent damage to the building structure. All soils along the foundation of the Albarelli building were removed and a small section of soils along the building foundation exhibited elevated PID readings as high as 58.4 ppm. In this area water was noted to seep out of the building foundation as the soil was scraped from the structure. This water was allowed to drain into the excavation before backfilling of this area occurred.


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The excavation progressed towards the east and south after the soils along the Albarelli building were excavated. PID readings along the eastern edge of the excavation were generally low to moderately high with PID readings ranging from 16.7 to 345 ppm. As the excavation extended to the south towards the existing pump island PID readings increased significantly. PID readings as high as 2,800 ppm were recorded along the southern edge of the excavation. Several areas of black stained soils were noted in these areas. Due to the presence of significant contamination along the southern edge the removal of contaminated soils expanded as far horizontally as possible in this area. Soils were exposed as close as possible to the existing pump island. An old stone foundation was noted along the southern edge of the excavation. Several pockets of heavy contamination were noted in this area and appeared to be trapped within the stone foundation. Excavation of contaminated soils extended to within 5 feet of the existing pump island and after as much contaminated soil was removed as possible this area was backfilled to prevent structural damage to the existing pump island.

The excavation continued towards the west. The sidewalk along Route 105 was removed and soils below were excavated to bedrock depth. Soils were excavated horizontally towards the west to the extent possible without compromising the structural integrity of Route 105. As the excavation continued towards the north beneath the sidewalk and along Route 105 several areas of heavy contamination were noted. PID readings as high as 2,160 ppm were measured in this area.

The excavation continued to the north in front of the Albarelli building. Bedrock was observed to be much deeper in this area; specifically, in the area where MW08-25 and MW-7 resided. Contaminated soils were excavated and removed to the extent possible in front of the Albarelli building. Soils were hand dug in front of the building to prevent damage to the building structure. PID readings were observed to be much lower in soils immediately in front of building as compared to soils closer to Route 105. The water and sewer lines were exposed as excavation continued in this area. Hand digging occurred along the water and sewer lines to prevent damage to these utilities. The excavation commenced on the northern side of the sewer line that connects into the Albarelli building on November 1, 2010.

The final excavation area was measured to be 4,250 ft2. The excavation was discontinued to the north at the Albarelli building and at the point of the sewer line connection as specified in the CAP. The excavation was discontinued to the east due to low PID readings remaining in the subsurface (16.7 ppm), to the west due to the presence of Route 105, and to the south due to the presence of the existing pump island. A map depicting the final excavation area is included in Appendix A. The excavation was filled with the “clean” soils excavated from the site and additional bank run fill between October 27 and November 1, 2010. Monitoring wells MW-6, MW-7, MW08-22, MW08-23, and MW08-25 were destroyed during the soil excavation activities. Photographs of the excavation are included in Appendix B.


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3.3 Soil Transport A total of 964.73 tons of excavated gasoline-impacted soils were loaded onto dump trailers and triaxle trucks and transported by various carriers to the New England Waste Services of Vermont landfill in Coventry, Vermont on October 27 to November 1, 2010. Bill of Lading Sheets for the soil transport and disposal are included in Appendix F.

3.4 Contaminant Mass Removal Based on the average concentration of gasoline-range Total Petroleum Hydrocarbons (TPH-GRO) in the three waste characterization soil samples collected on October 11, 2010, the 964.73 tons of contaminated soil that were excavated contained approximately 101 kilograms of gasoline. This is equivalent to 30 gallons of gasoline. Contaminant mass calculations are provided in Appendix C with the waste characterization data.

3.5 Excavation Dewatering and Treatment To facilitate the potential removal and treatment of groundwater during the excavation activities a 21,000 gallon frac tank was delivered to the Site on October 25, 2010. A Notice of Intent to discharge groundwater in accordance with general permit #3-9004 was prepared by KAS prior to the excavation event and approved by the State of Vermont. During the excavation groundwater was not flowing into the excavated area and thus removal and treatment of groundwater did not occur. The frac tank was removed from the Site on November 2, 2010. NOI # 3-4148 was terminated on November 2, 2010.

3.6 Replacement Well Installation On November 9, 2010, KAS supervised the installation of five, two-inch diameter replacement monitoring wells (MW-6R, MW-7R, MW-22R, MW-23R, and MW-25R) at the site. The wells were drilled and installed by T&K Drilling of Troy, New Hampshire, under the direct supervision of a KAS scientist. The five wells were drilled and installed in approximately the same location as MW-6, MW-7, MW08-22, MW08-23, and MW08-25. A boring log and construction diagram for the wells is included in Appendix D. PID readings in the saturated zone ranged from 2.6 to 467 ppm in soil samples collected from the replacement soil borings.

On November 9, 2010, the five replacement monitoring wells were located in azimuth and elevation for inclusion on the Site Map (Appendix A). The previously assigned arbitrary benchmark elevation of 92.20 feet for the top of the MW08-24 casing was retained for the survey conducted on this date.

4.0 GROUNDWATER FLOW DIRECTION AND GRADIENT Prior to groundwater sampling on November 18, 2010, monitoring wells MW-6R, MW-7R, MW-9, MW-13, MW-18, MW-19, MW-20, MW-22R, MW-23R, and MW-25R were monitored for the presence of LNAPL and depth-to-water with a Keck™ Interface Meter. Depth-to-water data were collected using the KAS Water/Product Level Measurement protocol. Monitoring well MW-21 could not be located during the November 18, 2010 site visit. It is believed this well has been paved over. Monitoring well MW08-24 had a blockage in the well casing and a depth to liquid measurement could not be collected.


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The measured depth to water ranged from 3.45 feet below top of casing (btoc) to 9.09 feet btoc in November 2010. No LNAPL was measured or observed in any of the on-site monitoring wells on this date. Liquid level monitoring results are tabulated as Liquid Level Monitoring Data in Appendix E.

Water table elevations for the November 18, 2010, event were plotted on the site map to generate the Groundwater Contour Map presented in Appendix A. Based on the data recorded, the groundwater flow direction and gradient was estimated to be towards the north at approximately 3.5%. This flow direction and gradient is consistent with historical results.

5.0 GROUNDWATER SAMPLING AND ANALYSES On November 18, 2010, groundwater samples were collected from eight monitoring wells (MW-6R, MW-7R, MW-9, MW-13, MW-18, MW-22R, MW-23R, and MW-25R) using disposable bailers. A groundwater sample could not be collected from MW08-24 due to a blockage in the well casing. The samples were collected according to KAS' Monitoring Well Sampling Protocol. Groundwater samples were analyzed for volatile organic compounds (VOCs) via EPA Method 8021B by Endyne, Inc., Laboratory Services (Endyne) of Williston, Vermont. Quality Assurance/ Quality Control (QA/QC) samples (a trip blank and duplicate sample) were also collected and analyzed via the EPA Method 8021B. Analytical results are summarized in tabular form in Appendix C. The applicable groundwater standards are provided for reference in this summary table. The analytical laboratory reports are also included in Appendix C.

The total targeted VOC concentration reported in the samples collected on November 18, 2010, were plotted on the site map to generate the Contaminant Distribution Map included in Appendix A.

5.1 Analytical Results The following summarizes the analytical laboratory results for the groundwater collected from the monitoring wells on November 18, 2010. Graphs depicting contaminant concentration trends for all monitoring wells are included in Appendix C.

Replacement Wells Concentrations of several compounds were reported in the groundwater sample collected from the five replacement wells (MW-6R, MW-7R, MW-22R, MW-23R, and MW-25R) on November 18, 2010 at levels exceeding their respective VGES. MTBE and/or naphthalene was not reported over the detection limit in some of the samples, but may still be present at a concentration which exceeds the VGES. The total reduction in the VOCs in groundwater collected from the five replacement monitoring wells ranged from 0.0% to 88% as compared to the established baseline concentrations. Although no reduction was noted in VOCs in groundwater collected from MW-6R the concentrations are within historical range at this sampling location.


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Remaining Wells A concentration of MTBE and/or benzene was reported in the groundwater sample collected from MW-9 and MW-13 on November 18, 2010 at levels exceeding their respective VGES. No VOCs were reported above the laboratory detection limit in the sample collected from MW-18 on November 18, 2010. VOC concentrations reported in groundwater collected from MW-9 and MW-13 are within historical range. VOC concentrations have remained at non-detectable levels in groundwater collected from MW-18 for three consecutive sampling rounds.

5.2 Quality Assurance and Control Sampling and Analysis No VOCs were detected in the trip blank sample prepared on November 18, 2010. Relative percent difference (RPD) is defined as one hundred times the difference between the actual sample and the duplicate sample, divided by the mean of the two samples. RPD values are used to determine if adequate quality assurance and control (QA/QC) were maintained during sample collection and analysis. For the November 18, 2010 sampling event, the duplicate sample was collected from monitoring well MW-7R. A negative bias was observed between the sample and duplicate with an RPD ranging from -0.8% to -14.4% for the tested compounds. The RPD values are within acceptable range. A tabular presentation of duplicate sample data and RPD results is included in Appendix C. The laboratory report and chain-of-custody forms are also presented in Appendix C.

5.3 Trend Analysis Based on the November 2010 data, the soil excavation that occurred at the Site in October/November 2010 has reduced contaminant concentrations on and off Site. On average, groundwater tested from the monitoring wells has decreased in contaminant concentrations since peak concentrations were noted and as compared to the established baseline concentrations for the five replacement wells. Percent decreases in wells since their peak concentration or since the well/location was first sampled is tabulated in the table below. Table 1: Percent Decrease in VOC Concentrations by Location

Pre Soil

Excavation Date of November

2010 Percent

Sample Location

Concentration (ppb)

Prior Concentration

Total VOC Concentration

(ppb)

Decrease

MW-6R 15.4 29,670 0.0% MW-7R 12,075 11,869 1.7% MW-9 27.5 42.0 0.0% MW-13 77.9 193 0.0% MW-18 ND ND Not Applicable MW-22R 10,170 9,744 4.2% MW-23R 117,460

April 2010

64,575 45.0% MW-25R 50,180 (FP) August 2008 6,233 87.6%


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Reduction has occurred in total VOC concentrations in four of the monitoring wells sampled on November 18, 2010 since their pre soil excavation concentration listed in Table 1. The total VOCs reported in monitoring well MW-7R, MW-22R, MW-23R, and MW-25R are at the lowest concentration reported to date at these locations. Contaminant concentrations for the other monitoring wells are within historical range. Although total VOC concentrations have declined on average since the soil excavation event and are at the lowest concentration reported to date at four locations; the continued presence of significant contamination upgradient beneath the existing pump island and Route 105 will continue to provide a source of dissolved phase contamination over time. This zone of contamination could not be removed during the soil excavation event without compromising the existing pump island and canopy. Contaminant Plume The contaminant plume continues to be present off site. Based on data collected in November 2010 the contaminant plume dissipates prior to reaching MW-18. The migration of contamination to the north is expected to continue due to the high to moderate concentrations remaining in groundwater on site; specifically, in the area near MW-23R (64,575 µg/L total VOCs) and the noted contamination beneath the existing pump island.

6.0 CONCLUSIONS Based upon the results of the most recent monitoring, KAS presents the following conclusions: • A total of approximately 964.73 tons of petroleum impacted soil was excavated and

subsequently transported to the New England Waste Services of Vermont Landfill in Coventry, Vermont between October 27 and November 1, 2010;

• The final excavation area was measured to be 4,250 ft2. The excavation was

discontinued to the north at the Albarelli building and at the point of the sewer line, to the east due to low PID readings remaining in the subsurface (16.7 ppm), to the west due to the presence of Route 105, and to the south due to the presence of the existing pump island;

• A significant amount of contaminated soil remained in the subsurface especially on the

south and west wall of the excavation. PID readings as high as 1,770 ppm and 860 were measured in the remaining soil along the southern and western wall of the excavation; respectively;

• A total of 83 soil samples were collected from the excavation for screening with a PID.

The highest readings were noted at saturated depths ranging from 4-9 feet below grade;


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• Three grab soil samples were collected from the excavation area on October 11, 2010 and submitted to Endyne for analysis of petroleum compounds via EPA Methods 8021B, 8015-GRO, total lead, and ignitability;

• Based on the average concentration of gasoline-range Total Petroleum Hydrocarbons

(TPH-GRO) in the three grab soil samples from the excavated area, the 964.73 tons of contaminated soil that were excavated contained approximately 101 kilograms (30 gallons) of gasoline;

• KAS supervised the installation of five, two-inch diameter replacement monitoring wells

(MW-6R, MW-7R, MW-22R, MW-23R, and MW-25R) at the site on November 9, 2010. The replacement wells were drilled and installed in the same approximate location as MW-6, MW-7, MW08-22, MW08-23, and MW08-25;

• Concentrations of several compounds were reported in the groundwater sample

collected from the five replacement wells (MW-6R, MW-7R, MW-22R, MW-23R, and MW-25R) on November 18, 2010 at levels exceeding their respective VGES. The total reduction in the VOCs in groundwater collected from these five monitoring wells ranged from 0.0% to 88% as compared to the established baseline concentrations;

• Greater than 85% reduction has occurred in total VOC concentrations in four of the

monitoring wells sampled on November 18, 2010 since their peak concentration. The total VOCs reported in monitoring well MW-7R, MW-22R, MW-23R, and MW-25R are at the lowest concentration reported to date for these locations. Contaminant concentrations for the other monitoring wells are within historical range;

• Although total VOC concentrations have declined on average since the soil excavation

event and are at the lowest concentration reported to date at four locations; the continued presence of significant contamination upgradient beneath the existing pump island will continue to provide a source of dissolved phase contamination over time; and,

• Based on the results of excavation and groundwater monitoring conducted at this site,

the objectives of Phase I of the corrective action -- to remove gross contamination and eliminate the continued presence of LNAPL in the vicinity of monitoring wells MW08-25 while reducing adsorbed and dissolved phase concentrations downgradient of the Site – have been successfully achieved, and at a greater rate than natural attenuation and manual LNAPL recovery alone.

7.0 RECOMMENDATIONS Based upon the above conclusions, KAS recommends the following 1) To continue to track the anticipated declined in dissolved phase contamination; a

groundwater monitoring event should be performed in February 2011 in accordance with the schedule presented in the CAP. Groundwater samples should be collected from


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monitoring wells MW-6R, MW-7R, MW-9, MW-13, MW-18, MW-22R, MW-23R, MW-24R, and MW-25R. Samples should be analyzed by EPA Method 8021B for presence of petroleum-related VOCs; and,

2) Dewatering of the neighboring Albarelli basement should be conducted in accordance

with Phase II of the CAP. KAS is currently working on completing this task.


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APPENDIX A

Site Location Map Site Map w/ Excavation Area Groundwater Contour Map

Contaminant Distribution Map

VTDEC Site #88-218

KAS Job Number: 410040057

Source: USGS 7.5 minute quadrangle, Richford, VT, Provisional Edition, dated 1986.

Scale 1:24,000 Contour interval 6 Meters

Site Location Map

Quick-Stop Sunoco

Richford, Vermont

Date: 5/23/05 Drawing: 1/1 Scale: 1”=2,000’ By: JR

SITE LOCATION


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APPENDIX B

Excavation Sketch Plan with Sample Locations Soil Screening Results

Site Photographs

Soil Screening Results Richford Sunoco, Richford, Vermont

October 27- November 1, 2010 Sample Depth (fbg) Location/ Comments PID Reading (ppm)

1 2 39.0 2 3 141 3 1 0.2 4 1 0.2 5 3 123 6 3 139 7 3 194 8 4 77.7 9 2-3 4.2 10 3-4 186 11 4 121 12 4-5 84.6 13 2-3 0.4 14 2-3 0.5 15 4-5 3.7 16 3 0.3 17 4 58.4 18 6 7.8 19 6 0.3 20 5 0.3 21 5 49.3 22 5 39.2 23 5 23.5 24 5 16.7 25 5 29.6 26 6 345 27 6 291 28 4-5 2,450 29 1-2 0.7 30 1-2 0.4 31 1-2 0.3 32 5-6 2,800 33 5-6 1,740 34 4-5 2,410 35 4-5 2,210 36 5 1,650 37 6 57.6 38 6-7 1,770 39 6-7 1,650 40 6-7 1,270 41 6-7 1,060 42 4-5 86.7 43 3-4 161 44 4 424 45 5-6

See Excavation Map for Locations

1,810

Soil Excavation 12/20/2010 Richford Sunoco, Richford, VT

Sample Depth (fbg) Location/ Comments PID Reading (ppm) 46 5-6 2,090 47 5-6 1,870 48 5-6 630 49 5-6 780 50 5-6 970 51 2-3 357 52 1-2 16.6 53 4-5 1,710 54 4-5 2,020 55 4-5 1,390 56 4-5 1,410 57 4-5 87.6 58 6 1,380 59 2 14.1 60 2 33.6 61 2 207 62 6 2,160 63 5-6 1,990 64 5-6 1,860 65 4-5 1,410 66 4-5 87.6 67 5-6 230 68 5-6 320 69 1-2 0.7 70 1-2 0.9 71 4 1,840 72 1-2 0.3 73 1-2 0.6 74 6-7 896 75 7 1,530 76 2 0.1 77 3 1.2 78 3-4 380 79 6 842 80 9 152 81 7 330 82 4-5 860 83 5-6

See Excavation Map for Locations

110

Photographic Documentation Soil Excavation Corrective Action Summary Report

Richford Sunoco, 73 Main Street Richford, Vermont VTDEC Site #88‐0218

View of the excavation area looking south prior to work beginning.

View of the excavation area looking north prior to work beginning.



View of the excavation upon removal of the asphalt and top layer of soil.

View of the excavation along the southern wall of the Albarelli building.



View of the southern extent of the excavation near the pump island where a stone

foundation was discovered.

View of the excavation area looking south on 10/28/10.



View of the excavation area down to bedrock where MW‐6 resided.

View of the excavation near Route 103 and where MW08‐25 resided.



View of heavy contamination noted near where MW08‐25 was destroyed.

View of the excavation as it progressed in front of the Albarelli building.



View of the excavation near the water line in front of the Albarelli building.

View of the extent of excavation in front of the Albarelli building.



View of the backfilling and site restoration activities on 11/1/10.

View of the installation of replacement well MW‐23R on 11/9/10.


12/20/2010 VTDEC Site #88-0218

APPENDIX C

Waste Characterization Data Groundwater Quality Data

Laboratory Analytical Reports

Richford SunocoRichford, Vermont

Waste Characterization Soil Sampling Data Summary

10/11/2010Waste Characterization Sample SC‐1 SC‐2 SC‐3 EPA Industrial CONTAMINANT MASS CALCULATIONSSample Depth (ft below grade) 6‐8' 4‐5' 4‐5' Regional ScreeningPID Reading (ppmv) 2,163 335.3 1,673 Levels (RSL) SOIL QUALITY PARAMETERPETROLEUM VOCs, EPA Method 8260b Total Petroleum Hydrocarbons‐GRO (mg/Kg)Benzene 236 2,140 58.5 5,400.Toluene 7,970 144 286 45,000,000. Mass of soil removed (tons) 964.73Ethylbenzene 940 17,200 1,910 27,000. Mass of soil removed (Kg) 875,203Total Xylenes 4,780 56,700 8,620 2,700,000. Density of Gasoline (Kg/gal) 3.31MTBE ND<30.0 63.2 ND<38.0 220,000.1,3,5‐trimethylbenzene 482 3,610 3,440 1,000,000. Mass of Gasoline Removed (Kg) 1011,2,4‐trimethylbenzene 1,590 13,400 9,970 260,000. Volume of Gasoline Removed (gal) 30Naphthalene 307 1,610 1,010 18,000.Total VOCs 16,305. 94,867. 10,980. ‐Total Lead, EPA Method 6010BTotal Lead (mg/Kg) 3.6 ND<2.0 3.7 800.Ignitability, EPA Chap 7.1Ignitability Negative Negative Negative ‐TOTAL PETROLEUM HYDROCARBONS, EPA Method 8015GROTPH 8015 GRO (mg/Kg) 27.4 193 123 50,000*

NOTES:

All values reported in ug/kg, dry, unless otherwise indicated.

ND<1.0 = Not Detected< Detection Limit

Results reported above detection limits are indicated in bold

RSL = EPA Regional Screening Level, November 2010

Results reported above RSL Industrial are shaded

NA = No PRG Standard

* VTDEC Hazardous Waste Standard

Average:115.

VTDEC Site #88-0218

KAS, Inc. Groundwater Quality Summary Richford SunocoRichford, Vermont

Well ID: MW‐6R MW‐7R MW‐9 MW‐13 MW‐18 MW‐22R MW‐23R MW08‐24 MW‐25R VGESPARAMETER Method: 8021B 8021B 8021B 8021B 8021B 8021B 8021B 8021B 8021B (ppb)Benzene 2,110 216 ND<1.0 47.4 ND<1.0 183 665 64.0 5.Toluene 13,100 775 ND<1.0 ND<5.0 ND<1.0 2,800 44,500 165 1,000.Ethylbenzene 1,210 892 ND<1.0 ND<5.0 ND<1.0 126 1,950 Well 608 700.Xylenes 9,340 6,670 ND<2.0 23.0 ND<2.0 5,220 15,000 Not 3,490 10,000.Total BTEX 25,760 8,553 ND 70.4 ND 8,329 62,115 Sampled 4,327 ‐ MTBE 202 ND<200 42.0 111. ND<2.0 ND<200 ND<2,000 50.2 40.

1,3,5‐Trimethylbenzene 867 782 ND<1.0 ND<5.0 ND<1.0 466 ND<1,000 Blockage In 508

1,2,4‐Trimethylbenzene 2,730 2,270 ND<1.0 11.2 ND<1.0 949 2,460 Well Casing 1,270

Naphthalene 313 264 ND<2.0 ND<10.0 ND<2.0 ND<200 ND<2,000 77.3 20.

Total Targeted VOCs 29,872 11,869 42.0 193. ND 9,744 64,575 6,233 ‐

All Values Reported in ug/L (ppb) unless otherwise notedND(X) ‐ None Detected above Detection Limit (Detection Limit)TBQ(X) ‐ Trace Below Quantitation Limit (Quantitation Limit)Blank cell ‐ not analyzedDetections are bolded.Values exceeding VGES are shaded. >VGESVGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005

11/18/2010

350.

KAS #410040057 VTDEC Site #88‐0218

KAS, Inc. Richford SunocoRichford, Vermont

Sample ID MW‐6R MW‐7R MW‐22R MW‐23R MW‐25R Trip Blank MW‐7R DUP

Sample Date 11/18/10 11/18/10 11/18/10 11/18/10 11/18/10 11/18/10 11/18/10

Volatile Organic Compounds ‐ EPA Method SW 8021B (µg/L) VGES (µg/L)

Benzene 2,110 216 183 665 64.0 ND<1.0 204 5

Toluene 13,100 775 2,800 44,500 165 ND<1.0 745 1,000

Ethylbenzene 1,210 892 126 1,950 608 ND<1.0 936 700

Xylenes, Total 9,340 6,670 5,220 15,000 3,490 ND<2.0 5,370 10,000

MTBE 202 ND<200 ND<200 ND<2,000 50.2 ND<2.0 56.1 40

1,3,5‐Trimethylbenzene 867 782 466 ND<1,000 508 ND<1.0 744

1,2,4‐Trimethylbenzene 2,730 2,270 949 2,460 1,270 ND<1.0 2,070

Naphthalene 313 264 ND<200 ND<2,000 77.3 ND<1.0 245 20

AVERAGE

Total VOCs 29,872. 11,869. 9,744. 64,575. 6,233. NA 10,370. 24,459

% Reduction 0% 74% 51% 42% 88% NA NA 47%

BASELINE 7,027 46,041 19,929 112,284 50,180 (FP) NA NA 46,320

25% Reduction 5,270 34,531 14,947 84,213 37,635 NA NA 35,319

50% Reduction 3,514 23,021 9,965 56,142 25,090 NA NA 23,546

75% Reduction 1,757 11,510 4,982 28,071 12,545 NA NA 11,773

90% Reduction 703 4,604 1,993 11,228 5,018 NA NA 4,709

Notes: 1) Groundwater samples collected by KAS personnel on November 18, 2010

2) ND<1.0 = not detected above laboratory detection limit

3) NA = not applicable

4) VGES = Vermont Groundwater Enforcement Standards (µg/L)

5) µg/L = micrograms per liter; aka parts per billion (ppb)

6) Bolded concentrations indicate those that were detected above laboratory detection limits

7) Shaded concentrations indicate those that are above the VGES

8) Samples analyzed at Endyne, Inc., Williston, Vermont

350

Richford, Vermont

11/18/10

REPLACEMENT WELL GROUNDWATER ANALYTICAL RESULTS CORRECTIVE ACTION SAMPLING EVENT # 1

Richford Sunoco

KAS # 410040057 VTDEC Site # 88-0218

KAS, Inc.

Groundwater Quality Summary


Monitoring Well 6Date of Sample Collection VGES

PARAMETER 11/6/1992 11/30/1993 3/16/1994 6/17/1994 10/4/1994 1/5/1995 4/10/1995 7/21/1995 10/13/1995 4/24/1996 12/17/1996 6/13/1997 12/19/1997 (ppb)Benzene 5,300. 2,900. 5,000. ND 130 ND ND(1.0) 110. 16. 5.Chlorobenzene ND No No No ND ND No ND ND ND ND(1.0) ND(1.0) ND(1.0) 100.1,2‐DCB ND Sample Sample Sample ND ND Sample ND ND ND ND(1.0) ND(1.0) ND(1.0) 600.1,3‐DCB ND ND ND ND ND ND ND(1.0) ND(1.0) ND(1.0) 600.1,4‐DCB ND 0.01' Well Thin Film ND ND 0.02' ND ND ND ND(1.0) ND(1.0) ND(1.0) 75.Ethylbenzene 1,660. Free Frozen Free ND ND Free ND ND ND 2.2 9.1 ND(1.0) 700.Toluene 37,800. Product Product 12,000. 27,000. Product 11,000. 840. ND ND(1.0) 270. 28. 1,000.Xylenes 7,580. 5,000. 6,800. 6,900. 2,100. ND 8.9 57. ND(1.0) 10,000.Total BTEX 52,340. 19,900. 38,800. 17,900. 2,940. 11.1 446. 44. ‐ 1,3,5‐TMB na na na na na na na na na1,2,4‐TMB na na na na na na na na naNapthalene na na na na na na na na na 20.MTBE 7,840. 8,800. 21,000. ND ND 1,400. ND(1.0) 1,600. 340. 40.Total VOCs 60,180. 28,700. 59,800. 17,900. 2,940. 1,400. 11.1 2,046. 384. ‐ GW Elevation (ft.) 91.92 91.46 ‐

VGESPARAMETER 6/17/1998 12/15/1998 6/30/1999 11/29/1999 6/8/2000 12/8/2000 6/6/2001 1/4/2002 7/25/2002 12/20/2002 6/25/2003 4/29/2004 4/29/2005 (ppb)

Benzene ND(1.0) 21. ND(1.0) ND(1.0) 1.1 22.2 71.0 252. 95.4 3.6 8.2 5.Toluene ND(1.0) 130 No ND(1.0) No ND(1.0) 1.2 15.5 87.8 444. 17.1 ND(1.0) 5.8 1,000.Ethylbenzene ND(1.0) 3.5 Sample ND(1.0) Sample ND(1.0) ND(1.0) 1.1 70.1 279. 64.7 3.3 13.3 700.Xylenes 4.5 13.8 TBQ(1.0) ND(1.0) 2.2 5.3 214. 1,200. 244. 15.1 64.6 10,000.Total BTEX 4.5 168.3 TBQ ND 4.5 44.1 443. 2,175. 421. 22.0 91.9 ‐ 1,3,5‐TMB na na Insufficient ND(1.0) Insufficient ND(1.0) ND(1.0) ND(1.0) 4.5 17.8 22.9 3.0 2.21,2,4‐TMB na na Water TBQ(1.0) Water ND(1.0) ND(1.0) ND(1.0) 16.6 64.4 37.4 6.7 14.9Naphthalene 1.2 3.5 in Well ND(1.0) in Well ND(1.0) ND(1.0) ND(1.0) 4.8 20.2 17.2 ND(1.0) 1.7 20.MTBE ND(1.0) 130 ND(1.0) ND(10.0) ND(10.0) 82.5 52.8 154. 83.4 17.3 23.2 40.Total VOCs 5.7 301.8 TBQ ND 4.5 126.6 522. 2,431. 582. 49.0 133.9 ‐ GW Elevation (ft.) 92.15 91.65 90.83 92.31 91.87 91.38 92.35 91.26 92.21 91.59 91.93 92.23 93.38 ‐

VGESPARAMETER 10/31/2005 10/2/2006 11/5/2007 8/1/2008 2/16/2009 12/2/2009 4/9/2010 (ppb)

Benzene 164. 375. 368. 510. 1,250 1.4 5.Toluene 139. 153. 140. 77.3 No 108 ND(1.0) Well 1,000.Ethylbenzene 105. 86.0 50.0 59.2 Sample 80.9 ND(1.0) Destroyed 700.Xylenes 426. 171. 151. 140. 269 4.9 10/27/2010 10,000.Total BTEX 834. 785. 709. 787. 1,708 6.3 ‐ 1,3,5‐TMB ND(5.0) ND(10.0) ND(5.0) ND(1.0) Well Not ND<10.0 ND(1.0)1,2,4‐TMB 36.5 45.7 ND(5.0) 10.8 Located 13.2 1.4Naphthalene 17.7 ND(20.0) ND(10.0) 4.7 Under ND<20.0 ND(2.0) 20.MTBE 28.1 36.3 57.3 19.5 Snow/Ice 89.2 7.7 40.Total VOCs 916. 867. 766. 822. 1,810 15.4 ‐ GW Elevation (ft.) 93.04 92.19 92.16 92.04 92.49 92.57 ‐

MW‐6RVGES

PARAMETER 11/18/2010 (ppb)Benzene 2,110 5.Toluene 13,100 1,000.Ethylbenzene 1,210 700.Xylenes 9,340 10,000.Total BTEX 25,760 ‐ 1,3,5‐TMB 8671,2,4‐TMB 2,730Naphthalene 313 20.MTBE 202 40.Total VOCs 29,670 ‐ GW Elevation (ft.) 92.79 ‐

All Values Reported in ug/L (ppb) na ‐ Not AnalyzedPrior to 6/17/98 analysis by EPA Method 602 ND(X) ‐ None Detected above Detection Limit (Detection Limit)Post 6/17/98 analysis by EPA 8021B TBQ(X) ‐ Trace Detected Below Quantitation Limit (Quantitation Limit)Detections are bolded. TMB ‐ trimethylbenzeneValues exceeding VGES are shaded. >VGESVGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005Data from 11/6/92 to 4/29/04 obtained from Griffin International, Inc.

350.

350.

350.

350.

VTDEC #88-218KAS #410040057

MW-6/6R Contaminant Concentrations vs. Groundwater ElevationRichford Sunoco

1.

10.

100.

1,000.

10,000.

100,000.

7/1/1992 7/1/1994 7/1/1996 7/1/1998 7/1/2000 7/1/2002 7/1/2004 7/1/2006 7/1/2008 7/1/2010 7/1/2012Date

Con

cent

ratio

n (p

pb)

90.0

90.5

91.0

91.5

92.0

92.5

93.0

93.5

94.0

Gro

undw

ater

Ele

vatio

n (ft

.)

Total BTEX Total VOCs GW Elevation

KAS, Inc.




PARAMETER 11/30/1993 3/16/1994 6/17/1994 10/4/1994 1/5/1995 4/10/1995 7/21/1995 10/13/1995 4/24/1996 12/17/1996 (ppb)Benzene 2,800. 5,300. 5,400. 4,100. 4,500. 3,600. 4,400. 4,200. 5.Ethylbenzene 2,000. 3,100. 5,200. 2,600. 1,400. ND 4,000. 3,100. No No 700.Toluene 8,900. 48,000. 46,000. 39,000. 33,000. 33,000. 44,000. 27,000. Sample Sample 1,000.Xylenes 8,400. 19,000. 22,000. 14,000. 14,000. 14,000. 19,000. 16,000. 10,000.1,3,5‐TMB na na na na na na na na 0.09 ft 0.22 ft1,2,4‐TMB na na na na na na na na Free FreeNapthalene na na na na na na na na Product Product 20.Total BTEX 22,100. 75,400. 78,600. 59,700. 52,900. 50,600. 71,400. 50,300. #N/A #N/A ‐ MTBE 6,800. 5,300. 6,100. 11,000. 4,200. 9,600. 7,900. 9,500. #N/A #N/A 40.BTEX+MTBE 28,900. 80,700. 84,700. 70,700. 57,100. 60,200. 79,300. 59,800. ‐

Date of Sample Collection VGESPARAMETER 6/13/1997 12/19/1997 6/17/1998 12/15/1998 6/30/1999 11/29/1999 6/8/2000 12/8/2000 6/6/2001 1/4/2002 (ppb)

Benzene 5,500. 5,300. 4,900. 5,400. 7,290. 4,680. 3,010. 6,040. 3,280. 4,890. 5.Ethylbenzene 3,600. 3,900. 3,400. 2,600. 3,270. 3,150. 2,830. 4,390. 2,510. 3,680. 700.Toluene 19,000. 39,000. 35,000. 30,000. 25,500. 21,400. 13,900. 31,400. 18,800. 32,900. 1,000.Xylenes 17,000. 18,000. 16,200. 13,700. 16,200. 15,400. 13,200. 22,500. 13,000. 18,700. 10,000.1,3,5‐TMB na na na na 1,030. 941. 927. 1,940. 735. 1,120.1,2,4‐TMB na na na na 3,420. 3,160. 3,160. 6,430. 2,660. 3,440.Napthalene na na 570. 660. 648. ND(200.) 659. 1,040. 484. 482. 20.Total BTEX 45,100. 66,200. 59,500. 51,700. 52,260. 44,630. 32,940. 64,330. 37,590. 60,170. ‐ MTBE 2,800. 2,100. 1,800. ND(500.) ND(2,000.) ND(2,000.) ND(2,000.) ND(2,000.) ND(2,000.) ND(1,000.) 40.Total VOCs 47,900. 68,300. 61,870. 52,360. 57,358. 48,731. 37,686. 73,740. 41,469. 65,212. ‐ GW Elevation (ft.) 90.89 90.92 91.05 90.94 90.45 91.27 90.92 90.58 90.92 90.58


Benzene 2,440. 2,650. 1,660. 1,090. 549. 1,090. 1,150. 1,370. 2,080. 5.Toluene 14,800. 16,100. 2,050. 8,070. 4,970. 1,090. Well 734. 2,130. 8,610. 1,000.Ethylbenzene 2,200. 2,670. 8,330. 2,380. 2,010. 2,530. Not 1,980. 1,740. 2,580. 700.Xylenes 11,000. 13,800. 10,600. 11,800. 10,000. 10,900. Sampled 9,350. 6,490. 12,500. 10,000.Total BTEX 30,440. 35,220. 22,640. 23,340. 17,529. 15,610. 13,214. 11,730. 25,770. ‐ 1,3,5‐TMB 738. 906. 905. 873. 897. 1,120. Parked 828. 727. 968.1,2,4‐TMB 2,540. 3,100. 2,950. 2,970. 2,780. 3,630. Over 3,210. 2,120. 3,450.Naphthalene 559. 648. 491. 260. 406. 536. 366. 467. 486. 20.MTBE 556. ND(400.) ND(200.) ND(200.) ND(200.) ND(200.) ND(200.) ND(200.) ND(200.) 40.Total VOCs 30,996. 39,874. 26,986. 27,443. 21,612. 20,896. 17,618. 15,044. 30,674. ‐ GW Elevation (ft.) 91.08 90.97 90.96 91.00 91.29 91.39 91.13 91.06 90.78

Monitoring Well 7 continuedDate of Sample Collection VGES

PARAMETER 12/2/2009 4/9/2010 (ppb)Benzene 1,470 413 5.Toluene 2,080 1,150 Well 1,000.Ethylbenzene 1,590 1,220 Destroyed 700.Xylenes 7,510 5,870 10,000.Total BTEX 12,650 8,653 10/27/2010 ‐ 1,3,5‐TMB 643 7181,2,4‐TMB 2,280 2,410Naphthalene 376 294 20.MTBE ND<200 ND<200 40.Total VOCs 15,949 12,075 ‐ GW Elevation (ft.) 91.35 91.13

MW‐7RDate of Sample Collection VGES

PARAMETER 11/18/2010 (ppb)Benzene 216 5.Toluene 775 1,000.Ethylbenzene 892 700.Xylenes 6,670 10,000.Total BTEX 8,553 ‐ 1,3,5‐TMB 7821,2,4‐TMB 2,270Naphthalene 264 20.MTBE ND<200 40.Total VOCs 11,869 ‐ GW Elevation (ft.) 91.07

All Values Reported in ug/L (ppb) na ‐ Not AnalyzedPrior to 6/17/98 analysis by EPA Method 602 ND(X) ‐ None Detected above Detection Limit (Detection Limit)Post 6/17/98 analysis by EPA 8021B TBQ(X) ‐ Trace Detected Below Quantitation Limit (Quantitation Limit)Detections are bolded. TMB ‐ trimethylbenzeneValues exceeding VGES are shaded. >VGES

350.

350.

350.

350.

350.

VTDEC #88-218KAS #410040057

MW-7 Contaminant Concentrations vs. Groundwater ElevationRichford Sunoco

0.

10,000.

20,000.

30,000.

40,000.

50,000.

60,000.

70,000.

80,000.

90,000.

7/1/1992 7/1/1994 7/1/1996 7/1/1998 7/1/2000 7/1/2002 7/1/2004 7/1/2006 7/1/2008 7/1/2010 7/1/2012

Date

Con

cent

ratio

n (p

pb)

89.0

89.5

90.0

90.5

91.0

91.5

92.0

Gro

undw

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Ele

vatio

n (ft

.)

Total VOC Concentration Total BTEX GW Elevation

KAS, Inc.




PARAMETER 3/31/1994 6/17/1994 10/4/1994 1/5/1995 4/10/1995 7/21/1995 10/13/1995 4/24/1996 12/17/1996 6/13/1997 12/19/1997 (ppb)Benzene ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 5.Chlorobenzene ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 100.1,2‐DCB ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 600.1,3‐DCB ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 600.1,4‐DCB ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 75.Ethylbenzene ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 700.Toluene ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 1,000.Xylenes ND ND ND ND ND ND ND ND ND(1) ND(1) ND(1) 10,000.1,3,5‐TMB na na na na na na na na na na na1,2,4‐TMB na na na na na na na na na na naNapthalene na na na na na na na na na na na 20.Total BTEX ND ND ND ND ND ND ND ND ND ND ND ‐ MTBE 150. 180. 670. 200. 110. 230. 500. 140. 71. 590. 550. 40.BTEX+MTBE 150. 180. 670. 200. 110. 230. 500. 140. 71. 590. 550. ‐ GW Elevation (ft.) 82.40 82.34 ‐

Date of Sample Collection VGESPARAMETER 6/17/1998 12/15/1998 6/30/1999 11/29/1999 6/8/2000 12/8/2000 6/6/2001 1/4/2002 7/25/2002 12/20/2002 6/25/2003 (ppb)

Benzene ND(1) ND(20.) ND(5.) ND(5.0) ND(2.0) ND(1.0) ND(2.0) ND(2.0) ND(1.0) 5.Ethylbenzene ND(1) ND(20.) No ND(5.) ND(5.0) No ND(2.0) ND(1.0) ND(2.0) ND(2.0) ND(1.0) 700.Toluene ND(1) 81. Sample ND(5.) ND(5.0) Sample ND(2.0) ND(1.0) ND(2.0) ND(2.0) ND(1.0) 1,000.Xylenes ND(1) 51. ND(5.) ND(5.0) ND(2.0) ND(1.0) ND(4.0) ND(4.0) ND(2.0) 10,000.Total BTEX ND 132. ND ND ND ND ND ND ND ‐ 1,3,5‐TMB na na Insufficient ND(5.) ND(5.0) Parked ND(2.0) ND(1.0) ND(2.0) ND(2.0) ND(1.0)1,2,4‐TMB na na Water ND(5.) ND(5.0) Over ND(2.0) ND(1.0) ND(2.0) ND(2.0) ND(1.0)Napthalene ND(1) ND(20.) in Well ND(5.) ND(5.0) ND(2.0) ND(1.0) ND(2.0) ND(2.0) ND(1.0) 20.MTBE 540. 500. #N/A 329. 474. 155. 200. 122. 188. 172. 40.Total VOCs 540. 632. 329. 474. 155. 200. 122. 188. 172. ‐ GW Elevation (ft.) 82.45 82.78 82.22 83.45 83.00 83.20 82.37 83.05 82.53 82.96 ‐


Benzene ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND<1.0 ND<1.0 ND<1.0 5.Toluene ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND(1.0) No No ND<1.0 ND<1.0 ND<1.0 1,000.Ethylbenzene ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND(1.0) Sample Sample ND<1.0 ND<1.0 ND<1.0 700.Xylenes ND(2.0) ND(2.0) ND(2.0) ND(2.0) ND(2.0) ND<2.0 ND<2.0 ND<2.0 10,000.Total BTEX ND ND ND ND ND ND ND ND ‐ 1,3,5‐TMB ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND(1.0) Paved Well Not ND<1.0 ND<1.0 ND<1.01,2,4‐TMB ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND(1.0) Over Located ND<1.0 ND<1.0 ND<1.0Napthalene ND(1.0) ND(1.0) ND(1.0) ND(1.0) ND(1.0) Under ND<2.0 ND<2.0 ND<2.0 20.MTBE 61.4 33.6 82.6 79.2 56.0 Ice/Snow 44.1 27.5 42.0 40.Total VOCs 61.4 33.6 82.6 79.2 56.0 44.1 27.5 42.0 ‐ GW Elevation (ft.) 83.25 83.67 83.59 83.13 83.08 83.42 83.30 82.95 ‐


350.

350.

350.

MW-9 MTBE Concentrations vs. TimeRichford Sunoco

0.

100.

200.

300.

400.

500.

600.

700.

800.

7/1/1992 7/1/1994 7/1/1996 7/1/1998 7/1/2000 7/1/2002 7/1/2004 7/1/2006 7/1/2008 7/1/2010 7/1/2012

Date

Con

cent

ratio

n (p

pb)

82.0

82.2

82.4

82.6

82.8

83.0

83.2

83.4

83.6

83.8

Gro

undw

ater

Ele

vatio

n (ft

.)

MTBE Concentration GW Elevation

VTDEC #88-218KAS #410040057

KAS, Inc.




PARAMETER 3/16/1994 6/17/1994 10/4/1994 1/5/1995 4/10/1995 7/21/1995 10/13/1995 4/24/1996 12/17/1996 6/13/1997 12/19/1997 (ppb)Benzene 680. 960. 1200. 750. 770. 1400. 1100. 1300. 1,500. 1,800. 760. 5.Ethylbenzene 93. ND ND ND ND 380. 190. 270. 190. 290. 160. 700.Toluene 620. 630. 670. ND ND 110. ND ND ND(1) ND(1) ND(50) 1,000.Xylenes 370. 140. 500. ND ND 740. 380. ND 100. 72. ND(50) 10,000.Total BTEX 1,763. 1,730. 2,370. 750. 770. 2,630. 1,670. 1,570. 1,790. 2,162. 920. ‐ 1,3,5‐TMB na na na na na na na na na na na1,2,4‐TMB na na na na na na na na na na naNapthalene na na na na na na na na na na na 20.MTBE 2,800. 8,400. 5,900. 14,000. 6,500. 6,800. 4,600. 14,000. 7,900. 8,500. 5,400. 40.Total VOCs 4,563. 10,130. 8,270. 14,750. 7,270. 9,430. 6,270. 15,570. 9,690. 10,662. 6,320.GW Elevation (ft.) 94.55 94.13

VGESPARAMETER 6/17/1998 12/15/1998 6/30/1999 11/29/1999 6/8/2000 12/8/2000 6/6/2001 1/4/2002 7/25/2002 12/20/2002 6/25/2003 (ppb)

Benzene 1,300. 810. 1780. 1230. 1,830. 1,260. 1,410. 1,160. 1,160. 914. 1,590. 5.Ethylbenzene 180. 180. 192. 117. 273. 167. 200. 158. 138. 96.4 26.1 700.Toluene ND(100) ND(50) ND(50) ND(50) ND(50.0) ND(50.0) ND(100.) ND(20.0) ND(20.0) ND(20.0) 209. 1,000.Xylenes ND(100) ND(50) ND(50) ND(50) 123. 82.2 174. 280. 147. 99.6 660. 10,000.Total BTEX 1,480. 990. 1,972. 1,347. 2,226. 1,509. 1,784. 1,598. 1,445. 1,110. 2,485. ‐ 1,3,5‐TMB na na ND(50) ND(50) ND(50.0) ND(50.0) ND(100.) 29.3 ND(20.0) ND(20.0) 69.51,2,4‐TMB na na 62.6 71.7 151 ND(50.0) 143. 136. 106. 67.7 262.Napthalene ND(100) na ND(50) ND(50) 86.3. ND(50.0) ND(100.) 24.1 32.5 21.4 67.1 20.MTBE 5,800. 6,100. 4,940. 3,780. 6,080. 4,250. 5,340. 3,810. 3,350. 3,240. 2,600. 40.Total VOCS 7,280. 7,090. 6,975. 5,199. 8,543. 5,759. 7,267. 5,597. 4,934. 4,439. 5,484.GW Elevation (ft.) 94.17 93.37 94.92 94.72 94.54 94.39 94.17 94.70

VGESPARAMETER 4/29/2004 4/29/2005 10/31/2005 10/2/2006 11/5/2007 2/16/2009 12/2/2009 4/9/2010 11/18/2010 (ppb)

Benzene 1,610. 735. 935. 523. 655. 79.0 ND<1.0 47.4 5.Toluene ND(50.0) ND(50.0) No ND(20.0) 10.9 ND(50.0) ND<20.0 ND<1.0 ND<5.0 1,000.Ethylbenzene 145. ND(50.0) Sample 58.7 48.7 ND(50.0) ND<20.0 5.2 ND<5.0 700.Xylenes 423. ND(100.) 226. 233. 492. 59.0 43.6 23.0 10,000.Total BTEX 2,178. 735. 1,220. 816. 1,147. 138.0 48.8 70.4 ‐ 1,3,5‐TMB ND(50.0) ND(50.0) 38.1 14.4 ND(50.0) ND<20.0 5.3 ND<5.01,2,4‐TMB 218. ND(50.0) 125. 72.6 202. 23.0 21.4 11.2Naphthalene ND(50.0) ND(50.0) ND(40.0) ND(20.0) ND(100.) ND<40.0 2.4 ND<10.0 20.MTBE 1,750. 1,710. 1,120. 653. 382. 235. ND<2.0 111. 40.Total VOCS 4,146. 2,445. 2,503. 1,556. 1,731. 396. 77.9 193.GW Elevation (ft.) 95.03 95.20 94.71 94.60 94.54 95.01 95.44 95.00


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MW-13 Contaminant Concentrations vs. TimeRichford Sunoco

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18,000.

7/1/1992 7/1/1994 7/1/1996 7/1/1998 7/1/2000 7/1/2002 7/1/2004 7/1/2006 7/1/2008 7/1/2010 7/1/2012

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VTDEC #88-218KAS #410040057

KAS, Inc.


Quick Stop SunocoRichford, Vermont

Monitoring Well 18

Date of Sample Collection VGESPARAMETER 9/13/2002 12/20/2002 6/25/2003 4/29/2004 4/29/2005 10/31/2005 10/2/2006 11/5/2007 (ppb)

Benzene ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 5.Ethylbenzene ND<1.0 No Sample ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 700.Toluene ND<1.0 Collected ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 1,000.Xylenes ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 10,000.Total BTEX ND ND ND ND ND ND ND ‐ 1,3,5‐TMB ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.01,2,4‐TMB ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0Napthalene ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 20.MTBE 99.1 4.3 21.6 ND<2.0 5.6 11.7 7.7 40.Total VOCs 99.1 4.3 21.6 ND 5.6 11.7 7.7 ‐

Date of Sample Collection VGESPARAMETER 12/2/2009 11/18/2010 (ppb)

Benzene ND<1.0 ND<1.0 5.Ethylbenzene ND<1.0 ND<1.0 700.Toluene ND<1.0 ND<1.0 1,000.Xylenes ND<2.0 ND<2.0 10,000.Total BTEX ND ND ‐ 1,3,5‐TMB ND<1.0 ND<1.01,2,4‐TMB ND<1.0 ND<1.0Napthalene ND<1.0 ND<1.0 20.MTBE ND<2.0 ND<2.0 40.Total VOCs ND ND ‐

All Values Reported in ug/L (ppb)Analysis by EPA 8021B ND(X) ‐ None Detected above Detection Limit (Detection Limit)Detections are bolded. TMB ‐ trimethylbenzeneValues exceeding VGES are shaded.VGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy, dated 2/14/2005Data from 9/13/02 to 4/29/04 obtained from Griffin International, Inc. >VGES

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VTDEC Site #88-218

KAS, Inc. Groundwater Quality Summary


MW08‐22Date of Sample Collection VGES

PARAMETER 8/1/2008 2/16/2009 12/2/2009 4/9/2010 (ppb)Benzene 668 471 677 540 5.Toluene 2,100 12,700 2,270 1,630 Well 700.Ethylbenzene 2,070 3,080 2,970 1,200 Destroyed 1,000.Xylenes 6,360 15,100 12,600 5,130 10/27/2010 10,000.Total BTEX 11,198 31,351 18,517 8,500 ‐ 1,3,5‐TMB 344 609 644 3091,2,4‐TMB 1,060 2,230 2,350 1,100Napthalene 308 454 480 261 20.MTBE ND(100.) ND(200.) ND(200.) ND(200.) 40.Total VOCS 12,910 34,644 21,991 10,170 ‐ GW Elevation (ft.) 94.81 93.67 95.22 95.13 ‐


PARAMETER 11/18/2010 (ppb)Benzene 183 5.Toluene 2,800 700.Ethylbenzene 126 1,000.Xylenes 5,220 10,000.Total BTEX 8,329 ‐ 1,3,5‐TMB 4661,2,4‐TMB 949Napthalene ND<200 20.MTBE ND<200 40.Total VOCS 9,744 ‐ GW Elevation (ft.) 94.56 ‐

All Values Reported in ug/L (ppb)na ‐ Not AnalyzedND(X) ‐ None Detected above Detection Limit (Detection Limit)TMB ‐ trimethylbenzeneDetections are bolded.Values exceeding VGES are shaded.VGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005

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VTDEC #88-218KAS #410040057

MW08-22/22R Contaminant Concentrations vs. Groundwater ElevationRichford Sunoco

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PARAMETER 8/1/2008 2/16/2009 12/2/2009 4/9/2010 (ppb)Benzene 5,230. 4,310. 4,370. 5.Toluene 75,900. No 79,900. 87,300. Well 700.Ethylbenzene 3,950. Sample 3,730. 3,720. Destroyed 1,000.Xylenes 19,800. 19,400. 19,300. 10/27/2010 10,000.Total BTEX 104,880. 107,340. 114,690. ‐ 1,3,5‐TMB 943. ND(1,000) ND(1,000)1,2,4‐TMB 2,570. Well 3,080. 2,770.Napthalene 579. Dry ND(2,000) ND(2,000) 20.MTBE ND(200.) ND(2,000) ND(2,000) 40.Total VOCs 108,972. 110,420. 117,460. ‐ GW Elevation (ft.) 94.71 ‐ 95.24 95.07 ‐


PARAMETER 11/18/2010 (ppb)Benzene 665. 5.Toluene 44,500. 700.Ethylbenzene 1,950. 1,000.Xylenes 15,000. 10,000.Total BTEX 62,115. ‐ 1,3,5‐TMB ND<1,0001,2,4‐TMB 2,460.Napthalene ND<2,000 20.MTBE ND<2,000 40.Total VOCs 64,575. ‐ GW Elevation (ft.) 94.12 ‐

All Values Reported in ug/L (ppb)na ‐ Not AnalyzedND(X) ‐ None Detected above Detection Limit (Detection Limit)TMB ‐ trimethylbenzeneDetections are bolded.Values exceeding VGES are shaded. >VGESVGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005

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VTDEC #88-218KAS #410040057

MW08-23/23R Contaminant Concentrations vs. Groundwater ElevationRichford Sunoco

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120,000.

140,000.

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PARAMETER 8/1/2008 2/16/2009 12/2/2009 4/9/2010 11/18/2010 (ppb)Benzene ND(1.0) 70.9 ND(1.0) 5.Toluene ND(1.0) 4.3 ND(1.0) Well Well 700.Ethylbenzene ND(1.0) 31.8 ND(1.0) Not Not 1,000.Xylenes ND(2.0) 89.6 ND(2.0) Sampled Sampled 10,000.Total BTEX ND 196.6 ND ‐ 1,3,5‐TMB ND(1.0) 7.2 ND(1.0) Parked Obstruction 1,2,4‐TMB ND(1.0) 32.0 ND(1.0) Over In WellNapthalene ND(2.0) 6.8 ND(2.0) Casing 20.MTBE 3.2 15.0 2.2 40.Total VOCS 3.2 257.6 2.2 ‐ GW Elevation (ft.) 88.55 88.23 88.70 ‐

All Values Reported in ug/L (ppb)na ‐ Not AnalyzedND(X) ‐ None Detected above Detection Limit (Detection Limit)TMB ‐ trimethylbenzeneDetections are bolded.Values exceeding VGES are shaded.VGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005

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VTDEC #88-218KAS #410040057




PARAMETER 8/1/2008 2/16/2009 12/2/2009 4/9/2010 (ppb)Benzene 3,830. 5.Toluene 23,700. No No No Well 700.Ethylbenzene 3,570. Sample Sample Sample Destroyed 1,000.Xylenes 14,200. 10/27/2010 10,000.Total BTEX 45,300. ‐ 1,3,5‐TMB 1,100. Well Not 0.64' 0.39'1,2,4‐TMB 3,150. Located LNAPL LNAPLNapthalene 630. Under 20.MTBE ND(400.) Snow/Ice 40.Total VOCs 50,180. ‐ GW Elevation (ft.) 91.36 ‐ ‐


PARAMETER 11/18/2010 (ppb)Benzene 64.0 5.Toluene 165. 700.Ethylbenzene 608. 1,000.Xylenes 3,490. 10,000.Total BTEX 4,327. ‐ 1,3,5‐TMB 508.1,2,4‐TMB 1,270.Napthalene 77.3 20.MTBE 50.2 40.Total VOCs 6,233. ‐ GW Elevation (ft.) 91.67 ‐

All Values Reported in ug/L (ppb)na ‐ Not AnalyzedND(X) ‐ None Detected above Detection Limit (Detection Limit)TMB ‐ trimethylbenzeneDetections are bolded.Values exceeding VGES are shaded. >VGESVGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005

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VTDEC #88-218KAS #410040057


PARAMETER Trip Blank MW‐7R DuplicateBenzene ND(1.0) 216 204 5.7Toluene ND(1.0) 775 745 3.9Ethylbenzene ND(1.0) 892 936 ‐4.8Xylenes ND(2.0) 6,670 5,370 21.61,3,5‐TMB* ND(1.0) 782 744 5.01,2,4‐TMB* ND(1.0) 2,270 2,070 9.2Naphthalene ND(2.0) 264 245 7.5MTBE ND(2.0) ND<200 56.1 NATotal Reported VOCs ND 11,869. 10,370. 13.5

* TMB = Trimethyl BenzeneEPA Method 8021B used for laboratory analysisAll values reported in ug/l (ppb) unless otherwise notedND(X) ‐ Not Detected (Detection Limit)TBQ(X) ‐ Trace Below Quantitation LimitDetections are bolded.Values exceeding VGES are shaded. >VGESVGES ‐ Vermont Groundwater Enforcement Standard; VTDEC Groundwater Protection Rule and Strategy , dated 2/14/2005NA ‐ not applicable

Quality Assurance and Control Summary

RPD

Richford, VermontRichford Sunoco

Date of Sample Collection: 411/18/10

The results of the laboratory analysis of the duplicate sample were analyzed using a relative percent difference (RPD) analysis. The RPD is defined as 100 times the difference in reported concentration between sample and duplicate, divided by the mean of the two samples. A small RPD indicates good correlation between sample and duplicate.

VTDEC #88-218KAS #410040057


12/20/2010 VTDEC Site #88-0218

APPENDIX D

Soil Boring Log and Monitoring Well Construction Diagram

Well No: MW-6RRichford SunocoRichford, VT

KAS Project #: 410040057 Date Installed: 11/9/2010Drilled by : T&K Drilling Drilling Method: 8.25" HSA

Driller: Kevin Singleton Boring Diameter.: 10"Supervised by: Jeremy Roberts Development Method: Bailing

Logged by: Jeremy Roberts Screened Length: 3 feetPen/Rec(') Interval (') Soil Characteristics

Grade = 0 BlowCounts PID (ppm) Asphalt Surface

0.5 Auger 0' - 2' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP1.0 Cuttings 0.0 Brown, Fill Material1.5 Ft<Grade2.02.53.03.5 2' / 1.1' 3'-5' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP4.0 3.60' 11/18/10 6-5-6-6 60.4 Brown, Moist, Petroleum Odor4.5 4.0' 11/9/105.05.5 2' / 1.2' 5'-6' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP6.0 19-17 151 Brown, Moist, Petroleum Odor

End of exploration at 6 feet (Bedrock Refusal)

Road Box with Bolt Down Cover, Set in Cement. Locking Plug.

Existing Surface. 2" ID, Schedule 40 PVC Riser.Bentonite Seal Placed in Annulus. 2" ID, Schedule 40 PVC, 0.010"-Slotted Well Screen

Grade #1 Silica Sand Pack Placed in Annulus. Plug PointDrill Cuttings Placed in Annulus.

Approximate Water Level During Drilling, below gradeStatic Water Level, below top of casing

Well Construction

BORING LOG AND WELL CONSTRUCTION DIAGRAM

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0.5 Auger 0' - 2' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP1.0 Cuttings 0.0 Brown, Fill Material1.5 Ft<Grade2.02.53.03.5 2' / 1.5' 3'-5' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP4.0 3.48' 11/18/10 5-7-11-9 3.9 Brown, Moist, No Odor4.55.05.5 5.0' 11/9/10 2' / 0.9' 5'-7' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP6.0 7-4-4-3 9.5 Brown, Wet, Slight Petroleum Odor6.57.07.5 2' / 0.7' 7'-9' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP8.0 2-2-2-4 173 Brown, Wet, Slight Petroleum Odor8.59.0

End of exploration at 9 feet (Bedrock Refusal)





Well Construction


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Logged by: Jeremy Roberts Screened Length: 4.5 feetPen/Rec(') Interval (') Soil Characteristics


0.5 Auger 0' - 2' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP1.0 Cuttings 0.0 Brown, Fill Material1.5 Ft<Grade2.02.53.03.5 2' / 1.3' 3'-5' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP4.0 4-8-8-8 2.6 Brown, Moist, No Odor4.5 4.21' 11/18/105.05.5 5.0' 11/9/10 2' / 1.1' 5'-7' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel SP6.0 8-7-8-7 2.1 Brown, Wet, Slight Petroleum Odor6.57.07.5

End of exploration at 7.5 feet (Bedrock Refusal)





Well Construction


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0.5 Auger 0' - 2' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel

SP1.0 Cuttings 0.0 Brown, Fill Material1.5 Ft<Grade2.02.53.03.5 2' / 1.2' 3'-5' Poorly graded SAND with gravel (SP). 70% sand, 30%

gravelSP

4.0 8-6-6-6 14.4 Brown, Moist, Slight Petroleum Odor4.55.05.5 5.0' 11/9/10 2' / 1' 5'-7' Poorly graded SAND with gravel (SP). 70% sand, 30%

gravelSP

6.0 5.13' 11/18/10 12-14 38.1 Brown, Moist, Slight Petroleum Odor6.57.0

End of exploration at 6.7 feet (Bedrock Refusal)






Well Construction

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0.5 Auger 0' - 2' Poorly graded SAND with gravel (SP). 70% sand, 30% gravel

SP1.0 Cuttings 0.0 Brown, Fill Material1.5 Ft<Grade2.02.53.03.5 2' / 1.5' 3'-5' Poorly graded SAND with gravel (SP). 70% sand, 30%

gravelSP

4.0 3.48' 11/18/10 5-6-11-13 19.0 Brown, Moist, No Odor4.55.05.5 5.0' 11/9/10 2' / 1.2' 5'-7' Poorly graded SAND with gravel (SP). 70% sand, 30%

gravelSP

6.0 10-10-7-5 30.1 Brown, Moist, Slight Petroleum Odor6.57.07.5 2' / 1.1' 7'-9' Poorly graded SAND with gravel (SP). 70% sand, 30%

gravelSP

8.0 2-2-3-2 32.7 Brown, Wet, Slight Petroleum Odor8.59.09.5 2' / 0.8' 9'-11' Poorly graded SAND with gravel (SP). 70% sand, 30%

gravelSP

10.0 3-5-9 467 Brown, Wet, Slight Petroleum Odor

End of exploration at ~10 feet (Bedrock Refusal)






Well Construction

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12/20/2010 VTDEC Site #88-0218

APPENDIX E

Liquid Level Monitoring Data


Liquid Level Monitoring Data

Monitoring Date: 11/18/10Well Top of Specific Corrected Corrected

Well I.D. Depth Riser Depth to Depth to Product Gravity Hydro Depth Water Table(ft) below Elevation Product Water Thickness of Product Equivalent To Water Elevationgrade (ft) (ft) (ft) (ft) (ft) (ft) (ft)

MW‐6R 6.3 96.39 ‐ 3.60 ‐ ‐ ‐ ‐ 92.79MW‐7R 8.7 94.55 ‐ 3.48 ‐ ‐ ‐ ‐ 91.07MW‐9 7.05 88.60 ‐ 5.65 ‐ ‐ ‐ ‐ 82.95MW‐10 10.2 104.43 ‐ NM ‐ ‐ ‐ ‐ NMMW‐12 10.35 99.70 ‐ NM ‐ ‐ ‐ ‐ NMMW‐13* 16 99.75 ‐ 4.75 ‐ ‐ ‐ ‐ 95.00MW‐16 6.15 88.59 ‐ NM ‐ ‐ ‐ ‐ NMMW‐18 10.0 88.46 ‐ 9.09 ‐ ‐ ‐ ‐ 79.37MW‐19 11.0 89.23 7.46 81.77MW‐20 13.0 90.13 ‐ 6.05 ‐ ‐ ‐ ‐ 84.08MW‐21 14.6 86.11 ‐ NM ‐ ‐ ‐ ‐ NMMW‐22R 6.6 98.77 ‐ 4.21 ‐ ‐ ‐ ‐ 94.56MW‐23R 5.9 99.25 ‐ 5.13 ‐ ‐ ‐ ‐ 94.12MW08‐24 5.75 92.20 ‐ NM ‐ ‐ ‐ ‐ NMMW‐25R 8.7 95.12 ‐ 3.45 ‐ ‐ ‐ ‐ 91.67

*Bedrock monitoring well

Top of Riser Elevations for MW1, MW2, MW3, and MW4 were revised in July 1995.

Risers were extended during site upgrade and repaving.

NM ‐ not measured

NA ‐ not available

Top of casing elevations for MW‐5 through MW‐7, MW‐9, MW‐10, MW‐12, MW‐13, and MW‐16 through MW‐18 were surveyed by Griffin International, Inc.

Top of casing elevations for MW‐19 through MW‐21 were surveyed by KAS, Inc. on 4/19/05

Top of casing elevations for MW‐6R, MW‐7R, MW‐22R, MW‐23R, and MW‐25R were surveyed by KAS, Inc. on 11/9/10

KAS #410040057 VTDEC Site #88-218


12/20/2010 VTDEC Site #88-0218

APPENDIX F

Bill of Lading Sheets

soil excavation report 12.2010 · the objective of phase i of the cap (soil excavation) was to...

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