SUPPLEMENTAL SUBSURFACE INVESTIGATION OF PETROLEUM

SUPPLEMENTAL SUBSURFACE INVESTIGATION

OF PETROLEUM CONTAMINATION

Brandon Exxon 3 Grove Street

Brandon, Vermont SMS Site #89-0454

February 3, 2011

Prepared for:

WESCO, Inc. 32 San Remo Drive

South Burlington, Vermont 05407

Prepared by:

368 Avenue D, Suite #15 P.O. Box 787

Williston, Vermont 05495 (802) 383-0486 (ph), (802) 383-0490 (fax)

www.kas-consulting.com

Supplemental Subsurface Investigation Brandon Exxon, Brandon, Vermont

February 2011 i VTDEC Site #89-0454

TABLE OF CONTENTS

1.0 INTRODUCTION / BACKGROUND ................................................................................. 1

2.0 SCOPE OF WORK ........................................................................................................... 1

3.0 HISTORICAL INFORMATION .......................................................................................... 1

4.0 SUBSURFACE EXPLORATION AND LABORATORY ANALYSES ............................... 2

4.1 PRE-DRILLING ACTIVITIES ............................................................................................... 2 4.2 MONITORING WELL INSTALLATION AND FIELD SCREENING OF SUBSURFACE SOILS ............ 2 4.3 GROUNDWATER SAMPLING AND LABORATORY ANALYSIS .................................................. 2

5.0 SITE HYDROGEOLOGY .................................................................................................. 3

5.1 GROUNDWATER FLOW DIRECTION AND GRADIENT ........................................................... 3 5.2 CONTAMINANT DISTRIBUTION .......................................................................................... 4

5.2.1 Soil ........................................................................................................................ 4 5.2.2 Groundwater .......................................................................................................... 4

6.0 CONCEPTUAL HYDROGEOLOGIC MODEL .................................................................. 5

6.1 SITE CONDITIONS............................................................................................................ 5 6.2 POTENTIAL SOURCES ...................................................................................................... 5 6.3 POTENTIAL RECEPTORS .................................................................................................. 5 6.3.1 SUBSURFACE AND GROUNDWATER ...................................................................... 5 6.3.2 WATER SUPPLIES ............................................................................................... 5 6.3.3 UTILITY CORRIDORS ........................................................................................... 6 6.3.4 BUILDINGS IN THE VICINITY .................................................................................. 6 6.3.5 SURFACE WATER ................................................................................................ 6 6.3.6 IMPACTED THIRD PARTIES ................................................................................... 6

7.0 CONCLUSIONS ................................................................................................................ 6

8.0 RECOMMENDATION ....................................................................................................... 7

APPENDICES Appendix A. Maps Appendix B. Soil Boring Logs and Monitoring Well Construction Diagram Appendix C. Liquid Level Monitoring Data Appendix D. Groundwater Quality Summary Data Appendix E. Analytical Laboratory Reports


February 2011 1 VTDEC Site #89-0454

1.0 INTRODUCTION

This report provides a summary of the methodology, results, conclusions, and recommendations completed for the Supplemental Subsurface Investigation (SSI) conducted at the Brandon Exxon (Site), located at 3 Grove Street in Brandon, Vermont (see Site Location Map, Appendix A). This work was performed in accordance with the Work Plan and Cost Estimate (WPCE) for a Supplemental Subsurface Investigation of Petroleum Contamination dated July 8, 2009. The WPCE was approved by Ms. Lynda Provencher of the Vermont Department of Environmental Conservation (VTDEC) in a letter to Mr. Bill Simendinger of WESCO, Inc dated July 17, 2009, providing that lead analysis was included in the groundwater sampling.

2.0 SCOPE OF WORK

This SSI was conducted to further characterize the extent and degree of contamination in the vicinity of and to the west of the Site. Results of the following investigative tasks performed by KAS are presented: soil boring advancement and monitoring well installation; soil screening; groundwater monitoring and calculation of flow direction and gradient; groundwater sampling; historical information review, and analysis of sensitive receptors in the vicinity of the Site.

3.0 HISTORICAL INFORMATION / BACKGROUND

The source(s) of petroleum contamination being monitored at this Site were gasoline and fuel oil underground storage tanks (USTs) that were removed in April 1999. The Site has been monitored since 1999, and is undergoing natural attenuation groundwater monitoring. A geotechnical investigation, which incorporated soil borings and environmental testing, was conducted by Golder Associates, Inc of Manchester, New Hampshire in 20031 and 20072. During those investigations, petroleum contaminated soils were noted along US Route 7 adjacent to the active Brandon Exxon Site. None of the soil samples contained concentrations of Gasoline Range Organics (GRO), Diesel Range Organics (DRO), or Volatile Organic Contaminants (VOCs) above regulatory standards. Concentrations of barium, chromium, and lead were detected above soil screening values. Temporary groundwater monitoring wells contained concentrations of VOCs and lead above screening values and concentrations of GRO above detection limits. Elevated PID readings ranged from 4.3 parts per million (ppm) to 973 ppm. The property adjacent to the northwestern boundary of the Site (9 Grove Street) appears to also have been a State Listed Hazardous Waste Site (VTDEC Site number #2007-3693) and was granted Sites Management Activity Complete (SMAC) status in 2008.3 The Site investigation report for this Site indicates the removal of two USTs, one was fuel oil and one was diesel.4 The location of the removed USTs was not available in this report.

1 Golder Associates, Inc, Notification of Soil Impacts, State of Vermont Agency of Transportation, Proposed Improvement, US Route 7, Brandon, Vermont, May 1, 2003. 2 Golder Associates, Inc, Supplemental Environmental Investigation Report, U.S. Route 7 Improvements, Brandon, Vermont, March, 2007. 3 VTDEC Environmental Interest Locator, February 1, 2011. 4 Longtrail Environmental, Site Investigation Report and Water Quality Summary, December 21, 2011.



4.0 SUBSURFACE EXPLORATION AND LABORATORY ANALYSES

4.1 Pre-Drilling Activities

Prior to the initiation of subsurface activities at the Site, a Health and Safety Plan (HASP) was prepared in accordance with Occupational Safety and Health Administration (OSHA) requirements. The Site and adjacent properties were pre-marked for Digsafe on December 21, 2010. KAS met with Mr. Bob Bove, off-Site property owner, on December 21, 2010 to discuss monitoring well locations. Digsafe was then contacted prior to the drilling activities, and DigSafe numbers 2010-5202797 and 2010-5202831 were assigned. Town of Brandon officials were also contacted for clearance of drilling locations related to underground utilities in the area.

4.2 Monitoring Well Installation and Field Screening of Subsurface Soils

On January 3, 2011 a total of four soil borings were advanced by T&K Drilling of Troy, New Hampshire, under the direct supervision of a KAS scientist. The soil borings were advanced using a track mounted direct-push Geoprobe with a 2-inch diameter macrocore sampler. The four soil borings were completed as monitoring wells MW11-5, MW11-6, MW11-7 and MW11-8. The monitoring well locations are indicated on the Site Map (Appendix A). A Geoprobe was used instead of the hollow stem auger rig specified in the Work Plan and Cost Estimate due to the presence of overhead lines in the vicinity of the Site. This change was approved by the VTDEC in an electronic mail message dated December 27, 2010. Soil samples were collected continuously from the borings. Soil samples were logged by the supervising scientist, and screened for the presence of VOCs using a MiniRae Classic photoionization device (PID). Prior to screening, the PID was calibrated with isobutylene referenced to benzene. Soils were screened using the KAS Jar/Polyethylene Bag Headspace Screening Protocol. Soil characteristics and contaminant concentrations were recorded by the KAS scientist in detailed soil boring logs and monitoring well construction diagrams, presented in Appendix B. The monitoring wells were constructed of 1 in. PVC with a 0.010-in. factory slotted screen. A coarse sand pack was placed around the screen of each well, and a bentonite seal was placed above the sand pack. The monitoring wells were completed with gripper caps and flush mounted roadboxes. The four new monitoring wells were surveyed in relative to the existing monitoring wells and to Site features on January 3, 2011. Subsurface Sediments Subsurface sediments encountered in the soil borings consisted mainly of sands with varying amounts of silt overlaying dense clay. Elevated PID readings were observed in the soil samples collected from each of the four soil borings. PID readings greater than 2,000 parts per million (ppm) were recorded in MW11-5 and MW11-8 in the 6 to 9 feet below grade (bg) and the 12 to 15 feet bg samples respectively. Visible sheens and strong odors were noted in these samples. PID readings ranged from 96.2 to 182.4 ppm in MW11-6. PID readings ranged from 0.1 to 6.6 ppm in MW11-7.

4.3 Groundwater Sampling and Laboratory Analysis



A groundwater sampling event was conducted on January 13 and January 14, 2011 to collect groundwater samples from the four newly installed monitoring wells (MW11-5 through MW11-8) and two of the existing monitoring wells (MW-2 and MW-3). The groundwater samples were collected using disposable bailers according to KAS' groundwater sampling protocol. The groundwater samples were stored on ice in the field and submitted to Endyne, Inc. of Williston, Vermont under proper chain-of-custody procedures. The samples were analyzed for volatile petroleum compounds (VOCs) by EPA 8021B and for total lead via EPA Method 3113B. For Quality Assurance/ Quality Control (QA/QC) purposes, one trip blank and one duplicate sample were submitted along with the groundwater samples. Select petroleum compounds were reported to be above the laboratory reporting limits and applicable Vermont Groundwater Enforcement Standards (VGES) in the groundwater samples collected from MW-2, MW-3, MW11-5, and MW11-8. Concentrations of VOCs below the VGES were reported in the samples collected from MW11-6 and MW11-7. Concentrations of lead in excess of the VGES were reported in the groundwater samples collected from MW11-5, MW11-6 and MW11-7 and MW11-8. Contaminant concentrations in the vicinity of MW-2 and MW-3 have decreased by 96% and 96% respectively since monitoring began in 1999. Tabulated groundwater results for the January 2011 groundwater monitoring event as well as historic results are tabulated in Appendix D. A copy of the laboratory report is included in Appendix E. 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 the sample and duplicate. For the groundwater sampling event conducted on January 13, 2011 the duplicate sample was collected from monitoring well MW-2. Absolute RPD values for individual compounds ranged from 0.6% to 15.9%, indicating adequate precision. The effect of spurious influences on sample quality was insignificant, as none of the tested compounds were detected above reporting limits in the trip blank collected on January 13, 2011. A tabular presentation of duplicate sample data and RPD results along with trip blank data is included in Appendix D.

5.0 SITE HYDROGEOLOGY

5.1 Groundwater Flow Direction and Gradient

Depth to groundwater measurements were collected from seven of the eight Site groundwater monitoring wells on January 13 and 14, 2011. Monitoring well MW-4 was frozen and could not be gauged. The well locations are shown on the Site Map in Appendix A. The depth to water was subtracted from the top-of-casing elevation to obtain the relative water table elevation. No floating product was detected in the monitoring wells. Depth to groundwater ranged from 4.84 feet bg in MW-3 to 19.95 feet bg in MW11-7. Liquid level monitoring data are presented in Appendix C. Water table elevations were plotted and contoured to illustrate the estimated gradient and direction of groundwater flow beneath the Site (see the Groundwater Contour Map, Appendix A). According to these data, the direction of groundwater flow beneath the Site is towards the



southwest with an approximate hydraulic gradient of 14%. Historical monitoring on the subject property indicated lower hydraulic gradients (between 1% and 2%) with a similar flow direction.

5.2 Contaminant Distribution

5.2.1 Soil A review of field screening data collected at the Site indicates that petroleum impacts to soils (adsorbed contamination) are present in the vicinity of each of the newly installed monitoring wells. Elevated PID readings were present in shallow soils on-Site (0-6 feet bg) and increased with depth. This may indicate a petroleum release from shallow piping or from a historic pump dispenser in this location. Elevated PID readings were found in deeper soils off-Site (generally 9-15 feet bg in MW11-8). PID readings in the vicinity of MW11-7 were slightly elevated at the surface and at the 6-8 feet bg depth. The shallow PID reading at MW11-7 is likely due to soil moisture. No odors or staining were noted in this sample. The highest concentrations of contamination appear to be located at the transition between sandy soil (above) and a dense clay layer (below). The dense clay layer below the sand is likely restricting the vertical migration of contaminants within the saturated zone.

5.2.2 Groundwater Groundwater analytical data collected at the Site indicate that dissolved petroleum constituents are present in moderately high concentrations in groundwater in the vicinity of monitoring wells MW-2, MW-3, MW11-5 and MW11-8, indicating the plume has migrated along a southwesterly path. The highest petroleum contaminant concentrations were reported in off-Site monitoring well MW11-8. Lower concentrations of petroleum constituents were reported in the vicinity of MW-2, MW11-6, and MW11-7, which represent the apparent edges of the plume. Total lead was present in each of the groundwater samples obtained in January 2011. The highest concentrations of lead were reported on-Site in MW11-5 with lower levels reported off-Site. The total lead plume follows a similar migration path to that of the petroleum plume. The highest levels of VOCs were evident in the off-Site monitoring wells, which suggests that the contaminant plume has migrated since the release(s). While there is evidence to suggest that the contamination in the off-Site monitoring wells has migrated from the Brandon Exxon Site, it is also possible that additional upgradient sources contributed to the contamination based on the lack of characterization to the north and the groundwater flow direction. According to this data, the petroleum and total lead contaminant plumes have migrated at least 140 feet in the southwesterly direction. The northern, western, and southern extent of the dissolved contaminant plumes was not determined in this investigation. The analytical results were plotted to show the distribution of dissolved contamination across the Site (see Contaminant Distribution Maps, Appendix A). The elevated concentrations of lead suggest that the contamination is historic. It should be noted that the presence of silt in the groundwater samples could have contributed to the increased concentrations of total lead reported since metals have a tendency to adsorb to silt.



Low flow sampling may be an appropriate sampling method if metal concentrations are analyzed in the future.

6.0 CONCEPTUAL HYDROGEOLOGIC MODEL

6.1 Site Conditions

The Site currently houses an operating gasoline filling station and convenience store and is located in a combined residential and commercial portion of Brandon, Vermont. According to this investigation and historic investigations performed at the Site, the native soils beneath the Site generally have a moderate permeability consisting generally of sand with varying amounts of silt and gravel underlain by a dense clay layer. The contamination is fairly close to the surface in the vicinity of the Site and then increases with depth away from the Site, and is most likely migrating along the sand/clay interface. The contaminant plume has migrated off-Site in a southwesterly direction, which is consistent with the groundwater flow direction in the vicinity of the Site. The northern, southern, and western extent of the contaminant plumes were not defined during this investigation.

6.2 Potential Sources

At this time the source of subsurface petroleum at the Site and off-Site is assumed to be leaks and/or spills associated with historic gasoline and #2 fuel oil USTs, and/or pump dispensers on the Brandon Exxon Site. However, due to the lack of soil and groundwater data to the north of the Site and the groundwater flow direction it is not known if an additional source(s) is present. Additional investigation would be needed to determine the full extent of the plume and additional sources.

6.3 Potential Receptors

During drilling activities conducted on January 3, 2011, a sensitive receptor survey was conducted. A determination of the potential risk to identified receptors was made based on proximity to the source area, groundwater flow direction, and contaminant concentration levels in subsurface soils and groundwater.

6.3.1 Subsurface and Groundwater

Based on PID readings and analytical results from groundwater samples, the subsurface soils and groundwater have been impacted from petroleum contamination at this Site.

6.3.2 Water Supplies

The Site and surrounding properties are served by a municipal water system. According to the Vermont Agency of Natural Resources Well Locator online software, 1 private supply well is located within a half mile of the Site. This well is located approximately 0.4 miles in the upgradient direction (northeast) of the Site. This well is not considered to be at risk of subsurface petroleum contamination from the Site at this time.



6.3.3 Utility Corridors

Utility corridors, including water, sewer, and natural gas are known to run in the vicinity of the Site. Given the proximity to soil and groundwater contamination on Site, the measured depth to groundwater at the Site (4.8 – 8.6 feet bg), and the calculated direction of groundwater flow across the Site, the utility corridors in the vicinity of Route 7 are potentially at risk due to subsurface contamination at the Site.

6.3.4 Buildings in the Vicinity

Nearby buildings which could possibly be impacted by soil and groundwater contamination include the Brandon Baptist Church and the Brandon Museum and Visitor Center. Screening for VOCs was not conducted in either building during this Site investigation because KAS could not gain access to the buildings. Both of these buildings are potentially at risk due to subsurface contamination at the Site.

6.3.5 Surface Water

The nearest surface water body in an apparent hydraulically downgradient direction from the Site is Otter Creek and its associated wetland areas located approximately 2,600-5,000 feet west-southwest of the Site. No wetlands or drainage ditches were observed on-Site. Based on distance from the Site, Otter Creek and its associated wetland areas are not considered to be at risk of subsurface petroleum contamination from the Site at this time.

6.4 Impacted Third Parties

The properties located to the southwest of the Brandon Exxon Site have been impacted from soil and groundwater contamination. Additional properties may have been impacted from petroleum contamination but the full extent of the contaminant plume is not known at this time.

7.0 CONCLUSIONS

1. A total of four soil borings were advanced during drilling activities conducted on January 3,

2011 and completed as monitoring wells MW11-5, MW11-6, MW11-7, and MW11-8. Soil screening from the borings indicated the presence of elevated VOC levels in the vicinity of each of the soil borings. Elevated PID readings were present in shallow soils on-Site and increased with depth. Elevated PID readings were generally noted in deeper soils, at the sand/clay interface in off-Site soil borings.

2. Groundwater flow beneath the Site is towards the southwest with an approximate hydraulic

gradient of 14%. The groundwater flow is similar to historical observations while the hydraulic gradient is higher than previously calculated.

3. Groundwater analytical results indicate that VOCs above the VGES are present in

groundwater in the vicinity of monitoring wells MW-2, MW-3, MW11-5 and MW11-8. VOCs were also detected above laboratory reporting limits but below the VGES in groundwater collected from monitoring wells MW11-6 and MW11-7.

4. Concentrations of total lead in excess of the VGES were reported in the groundwater

samples collected from MW11-5, MW11-6, MW11-7, and MW11-8.



5. Contaminant plumes have migrated at least 140 feet off-Site. The downgradient and

crossgradient extent of the plumes were not defined during this investigation. 6. A sensitive receptor survey conducted based on soil and groundwater data collected during

this investigation indicate both off-Site buildings as well as utility corridors located along the Site are potentially at risk of petroleum contamination impact. Additional data is needed to fully characterize these risks.

8.0 RECOMMENDATION

Based on the results of the SSI, KAS recommends the following: 1. An additional round of groundwater monitoring should be conducted at the Site to track

levels of petroleum contamination in Site groundwater. Monitoring wells MW-2, MW-3, MW11-5, MW11-6, MW11-7, and MW11-8 should be sampled for VOCs via EPA 8021B, lead scavengers, and total lead during the monitoring event, which should be scheduled for the Summer of 2011.

2. Both of the nearest off-Site buildings should be screened for VOCs using a PID during the next monitoring event.

3. Sanborn maps and other historical records should be reviewed to determine the past

uses of the property and adjacent properties and to determine if additional source(s) exist(ed) in the area.

4. Given the contaminant concentrations in the furthest downgradient monitoring wells,

KAS recommends installing additional downgradient and crossgradient monitoring wells to determine the extent and magnitude of the plume. KAS can provide a Work Plan and Cost Estimate to conduct this work upon request.

Maps

SITE

Date: 04/24/06 Drawing No. Scale: By: AR

Site Location Map

VTDEC Site#: 89-0454

Source: www.maptech.com

Brandon ExxonBrandon, Vermont

NORTH

Soil Boring Logs and Monitoring Well Construction Diagrams

Well No: MW11-5Site: Brandon ExxonTown, State: Brandon, Vermont

KAS Project #: 402050165 Date Installed: 1/3/2011VTDEC Site #: 89-0454 Drilling Method: Geoprobe

Drilled by : T&K Drilling Boring Diameter.: 2"Driller: Sean/Kevin Development Method: Bailer

Logged by: SD Screened Length: 6 FeetPen/Rec(') Interval (') Soil Characteristics

Grade = 0 BlowCounts PID (ppm) Top Soil Surface

0.5 N/A 0-3 Dry, light brown, well graded sand (SW)

1.0 NR 0.8 SW

1.5 Ft<Grade

2.0

2.5

3.0

3.5 N/A 3-6 Wet, olive/light brown, well graded sand (SW)

4.0 NR 9.8

4.5

5.0

5.5

6.0

6.5 N/A 6-9 Wet, black, well graded sand with silt (SW-SM) SW-

7.0 NR >2,000 Strong petro odor, visible sheen SM

7.5

8.0

8.5

9.0

9.5 End of exploration 9 feet bg

10.0

10.5

11.0

11.5

12.0

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

Existing Surface. 1" ID, Schedule 40 PVC Riser.

Bentonite Seal Placed in Annulus. 1" ID, Schedule 40 PVC, 0.010"-Slotted Well Screen

Grade #1 Silica Sand Pack Placed in Annulus. Plug Point

Drill Cuttings Placed in Annulus.

NR Not Recorded Approximate Water Level During Drilling, below grade

Static Water Level, below top of casing

Well Construction

BORING LOG AND WELL CONSTRUCTION DIAGRAM

Legend

Gra

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Le

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~5.8' 1/3/115.95' 1/13/11






0.5 N/A 0-3 Dry, light brown, well graded sand (SW)

1.0 3/2 182.4 SW

1.5 Ft<Grade

2.0

2.5

3.0

3.5 N/A 3-6 Moist to wet, light brown, poorly graded sand with SP

4.0 NR 96.2 with gravel (SW)

4.5 Slight petro odor

5.0

5.5

6.0

6.5 N/A 6-9 Wet, olive/brown, clayey sand (SC) SC

7.0 NR 119.4 Dense clay encountered at 6 feet bg

7.5

8.0

8.5

9.0

9.5


10.5

11.0

11.5

12.0








Well Construction


Legend

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~6' 1/3/11

6.30' 1/13/11






0.5 N/A 0-3 Dry, reddish brown, poorly graded sand (SP)

1.0 3/1.4 1.8 SP1.5 Ft<Grade

2.0

2.5

3.0

3.5 N/A 3-6 Dry, light brown, poorly graded sand with silt (SP-SM) SP4.0 3/2.5 0.44.5

5.0

5.5

6.0

6.5 N/A 6-8 Dry, olive/light brown, poorly graded sand with silt SP7.0 3/1.9 6.6 (SP-SM)

7.5

8.0

8.5 N/A 8-11 Dry, light brown, silty sand (SM) SM9.0 3/2.8 0.29.5

10.0

10.5

11.0

11.5 N/A 11-13 Dry, light brown, poorly graded sand (SP) SP12.0 3/2.3 0.312.5

13.0

13.5 N/A 13-15 Dry, white/light brown, poorly graded sand (SP) SP14.0 NR 0.214.5

15.0

15.5 N/A 15-18 Dry, light brown, poorly graded sand (SP) SP16.0 NR 0.116.5

17.0

17.5

18.0

18.5 N/A 18-21 Wet, light brown, poorly graded sand with silt (SP-SC) SP19.0 NR 0.9 Dense clay layer 21feet bg19.5

20.0

20.5

21.0

21.5

22.0

22.5

23.0

23.5









Well Construction


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Let

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~20.5' 1/3/11

19.95' 1/13/11






0.5 N/A 0-3 Dry, reddish brown, poorly graded sand with gravel (SP)

1.0 3/1.5 0.0 SP

1.5 Ft<Grade

2.0

2.5

3.0

3.5 N/A 3-6 Dry, olive, poorly graded sand with gravel (SP) SP

4.0 3/2.3 0.0

4.5

5.0

5.5

6.0

6.5 N/A 6-9 Dry, light brown, poorly graded sand (SP) SP

7.0 3/2.4 0.1

7.5

8.0

8.5

9.0

9.5 N/A 9-12 Dry to wet, light brown, poorly graded sand (SP) SP

10.0 3/2.5 1.4

10.5

11.0

11.5

12.0

12.5 N/A 12-15 Wet, black, poorly graded sand (SP) SP

13.0 NR >2,000 Strong petro odor

13.5

14.0

14.5

15.0

15.5 End of exploration 15 feet bg16.0








Well Construction


LegendG

rap

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11.83' 1/13/11

~11.5' 1/3/11

Liquid Level Monitoring Data

KAS, Inc Brandon ExxonBrandon, Vermont

January 13-14, 2011Top Specific Corrected Corrected

Well I.D. Well Depth of Casing Depth to Depth to LNAPL Gravity Hydro Depth Water TableElevation Product Water Thickness of LNAPL Equivalent to Water Elevation

MW-1 14.57 98.99 - 5.39 - - - 5.39 93.60MW-2 14.45 98.57 - 8.62 - - - 8.62 89.95MW-3 14.69 98.75 - 4.84 - - - 4.84 93.91MW-4 14.59 99.65 - NM - - - NM NM

MW11-5 8.60 98.63 5.95 - - - 5.95 92.68MW11-6 9.70 98.61 6.30 - - - 6.30 92.31MW11-7 23.89 98.89 19.95 - - - 19.95 78.94

Liquid Level Monitoring DataBrandon Exxon

Brandon, Vermont

Monitoring Date:

MW11 7 23.89 98.89 19.95 19.95 78.94MW11-8 14.71 99.09 11.83 - - - 11.83 87.26

NOTES: All values reported in feetN/A - Data not available or not applicableDepth to water for MW11-7 and MW11-8 obtained on January 14, 2011

VTDEC Site #89-0450KAS #402050165


Historic Liquid Level Monitoring Data

Measurement Date:Well I.D. 7/30/1999 4/17/2001 4/4/2002 4/1/2003 5/6/2004 4/11/2005 5/23/2006 5/13/2008 1/13/2011

MW-1 92.20 94.78 93.91 94.17 93.53 94.02 94.01 93.59 93.60MW-2 88.48 94.15 93.54 93.7 93.13 93.51 93.71 93.28 89.95MW-3 92.06 95.09 94.22 94.4 93.81 94.36 94.37 93.86 93.91MW-4 92.67 96.30 94.77 95.09 94.3 95.14 95.04 94.37 NMMW11-5 NI NI NI NI NI NI NI NI 92.68MW11-6 NI NI NI NI NI NI NI NI 92.31MW11-7 NI NI NI NI NI NI NI NI 78.94*MW11-8 NI NI NI NI NI NI NI NI 87.26*

NOTES:

All values reported in feet.

Elevations are based on Arbitrary Datum - MW-1 top of casing at 98.99'

NI - not installed

*Liquid levels for MW11-7 and MW11-8 obtained on January 14, 2011

Brandon ExxonBrandon, VT

VTDEC Site #89-0450KAS #402050165

Groundwater Quality Summary Data


8021B

PARAMETER 07/30/99 01/05/00 07/19/00 10/31/00 04/17/01 04/04/02 04/01/03 05/06/04 04/11/05 05/23/06 VGESBenzene TBQ <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 Removed Removed 5Toluene ND <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 From From 1,000Ethylbenzene ND <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 Sampling Sampling 700Xylenes ND <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<2.0 ND<2.0 Schedule Schedule 10,000

Total BTEX TBQ <1 ND ND ND ND ND ND ND NS NS -

MTBE 61.0 68.9 33.7 87.1 13.6 5.8 4.9 2.5 401,3,5 Trimethylbenzene TBQ <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 41,2,4 Trimethylbenzene TBQ <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 5Naphthalene ND <1 ND<1 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<2.0 20

Total Targeted VOCs 61. 68.9 33.7 87.1 13.6 5.8 4.9 2.5 NS NS -

NOTES: All values reported in ug/l (ppb) unless otherwise notedTBQ <1 - trace below quantitation limit (quantitation limit)Results reported above detection limits are indicated in boldVGES = Vermont Groundwater Enforcement Standard Values greater than the VGES (Table 1 of the Groundwater Protection Rule and Strategy ) are shaded.ND<X - Not Detected (Detection Limit); TBQ < X Trace Below Quantitation LimitNS - Not Sampled

MW-1

Groundwater Quality SummaryBrandon Exxon

Brandon, Vermont

VTDEC Site #89-0450KAS #402050165


May 2005VTDEC Site #89-0454

KAS #402050165

88.5

89

89.5

90

90.5

91

0.

10.

20.

30.

40.

50.

60.

70.

80.

90.

100.

07/24/98 12/06/99 04/19/01 09/01/02 01/14/04 05/28/05 10/10/06

Gro

undw

ater

Ele

vati

on (

ft)

Tot

al T

arge

ted

VO

Cs

(ppb

)

Date

Monitoring Well MW-1Total Targeted VOCs and Groundwater Vs. Time

Total Targeted VOCs Groundwater Elevation


8021B

PARAMETER 07/30/99 01/05/00 07/19/00 10/31/00 04/17/01 04/04/02 04/01/03 05/06/04 04/11/05 05/23/06 VGESBenzene 25.0 53.5 9. 4.5 ND<1.0 ND<1.0 ND<1.0 1.0 ND<1.0 ND<1.0 5Toluene 285. 39.2 15. 13.2 ND<1.0 11.1 ND<1.0 46.4 ND<1.0 ND<1.0 1,000Ethylbenzene 742. 185. 85. 127. 2.3 13.5 1.5 30.8 ND<1.0 ND<1.0 700Xylenes 2,900. 393. 209. 165. 2.6 253. ND<2.0 272. ND<2.0 ND<2.0 10,000

Total BTEX 3,952. 671. 317. 310. 4.9 278. 1.5 350.2 ND ND -

MTBE ND <200 88.1 35.8 23.5 ND<10.0 ND<5.0 79.4 11.6 3.9 4.0 401,3,5 Trimethylbenzene 307. 66.5 19. 8.9 ND<1.0 33.4 ND<1.0 35.2 ND<1.0 ND<1.0 41,2,4 Trimethylbenzene 1030. 296. 136. 223. 2.1 47.8 5.6 137. ND<1.0 ND<1.0 5Naphthalene 193. 44.8 21.7 46.7 1.5 10.0 ND<1.0 52.5 ND<1.0 ND<2.0 20

Total Targeted VOCs 5,482. 1,166. 530. 612. 8.5 369. 86.5 586.5 3.9 4.0 -

8021B

PARAMETER 05/13/08 01/13/11 VGESBenzene 1.1 45.7 5Toluene ND<1.0 17.2 1,000Ethylbenzene 1.5 13.3 700Xylenes 5.5 29.5 10,000

Total BTEX 8.1 105.7 -

MTBE ND<2.0 23.9 401,3,5 Trimethylbenzene ND<1.0 9.51,2,4 Trimethylbenzene 5.4 54.8Naphthalene ND<2.0 2.9 20

Total Targeted VOCs 13.5 196.8 -

Total Lead NT 14. 15

NOTES: All values reported in ug/l (ppb) unless otherwise notedTBQ <1 - trace below quantitation limit (quantitation limit)Results reported above detection limits are indicated in boldVGES = Vermont Groundwater Enforcement Standard Values greater than the VGES (Table 1 of the Groundwater Protection Rule and Strategy ) are shaded.ND<X - Not Detected (Detection Limit); TBQ < X Trace Below Quantitation LimitNS - Not SampledNT-Not Tested

MW-2

MW-2


Brandon, Vermont

350

VTDEC Site #89-0450KAS #402050165



KAS #402050165

88.00

89.00

90.00

91.00

92.00

93.00

94.00

95.00

0.

1,000.

2,000.

3,000.

4,000.

5,000.

6,000.

07/24/98 12/06/99 04/19/01 09/01/02 01/14/04 05/28/05 10/10/06 02/22/08 07/06/09 11/18/10 04/01/12

Gro

undw

ater

Ele

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ft)

Tot

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ted

VO

Cs

(ppb

)

Date




8021B

PARAMETER 07/30/99 01/05/00 07/19/00 10/31/00 04/17/01 04/04/02 04/01/03 05/06/04 04/11/05 05/23/06 VGESBenzene TBQ <50 ND<20 ND<20 32.6 ND<10.0 ND<20.0 ND<20.0 ND<20.0 ND<20.0 49.8 5Toluene 301. 97.1 155. 165. 17.5 59.1 31.9 ND<20.0 ND<20.0 ND<20.0 1,000Ethylbenzene 783. 282. 376. 458. 71.6 150. 162. 59.8 75.9 44.6 700Xylenes 6,070. 1,830. 2,600. 2,580. 485. 1130. 1,190. 386. 581. 296. 10,000

Total BTEX 7,154. 2,209. 3,131. 3,236. 574. 1,339. 1,384. 446. 657. 390. -

MTBE ND <500 ND<200 ND<200 ND<200 ND<100. ND<100. ND<40.0 ND<40.0 ND<40.0 ND<40.0 401,3,5 Trimethylbenzene 1100. 444. 575. 529. 173. 384. 402. 365. 422. 426. 41,2,4 Trimethylbenzene 3510. 1,230. 1,790. 1850. 536. 1220. 1,200. 1,240. 1,180. 1,070. 5Naphthalene 431. 195. 201.0 358. 67.8 110. 92.3 118.0 45.6 54.6 20

Total Targeted VOCs 12,195. 4,078. 5,697. 5,973. 1,351. 3,053. 3,078. 2,169. 2,305. 1,941. -

8021B

PARAMETER 05/13/08 01/13/11 VGESBenzene 15.7 15.8 5Toluene ND<5.0 ND<10.0 1,000Ethylbenzene 19.1 ND<10.0 700Xylenes 117. 36.3 10,000

Total BTEX 152. 52.1 -

MTBE ND<10.0 61.1 401,3,5 Trimethylbenzene 241. 196.1,2,4 Trimethylbenzene 497. 530.Naphthalene 21.3 ND<20.0 20

Total Targeted VOCs 911. 839. -

Total Lead NT 12. 15


MW-3

Groundwater Quality Summary

MW-3

350


VTDEC Site #89-0450KAS #402050165



KAS #402050165

91.50

92.00

92.50

93.00

93.50

94.00

94.50

95.00

95.50

0.

2,000.

4,000.

6,000.

8,000.

10,000.

12,000.

14,000.

07/24/98 12/06/99 04/19/01 09/01/02 01/14/04 05/28/05 10/10/06 02/22/08 07/06/09 11/18/10 04/01/12

Gro

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ater

Ele

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ft)

Tot

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VO

Cs

(ppb

)

Date




8021B

PARAMETER 07/30/99 01/05/00 07/19/00 10/31/01 04/17/01 04/04/02 04/01/03 05/06/04 04/11/05 05/23/06 VGESBenzene ND <1 ND <1 ND <1 ND <1 ND <1 Removed Removed Removed Removed Removed 5Toluene ND <1 ND <1 ND <1 ND <1 ND <1 From From From From From 1,000Ethylbenzene ND <1 ND <1 ND <1 ND <1 ND <1 Sampling Sampling Sampling Sampling Sampling 700Xylenes ND <1 ND <1 ND <1 ND <1 ND <1 Schedule Schedule Schedule Schedule Schedule 10,000

Total BTEX ND ND ND ND ND NS NS NS NS NS -

MTBE ND <10 ND <10 ND<10 ND<10.0 ND<10.0 401,3,5 Trimethylbenzene ND <1 ND <1 ND <1 ND <1 ND <1 41,2,4 Trimethylbenzene ND <1 ND <1 ND <1 ND <1 ND <1 5Naphthalene ND <1 ND <1 ND <1 ND <1 ND <1 20

Total Targeted VOCs ND ND ND ND ND NS NS NS NS NS -


MW-4


Brandon, Vermont

VTDEC Site #89-0450KAS #402050165


8021BPARAMETER 01/13/11 VGES

Benzene ND<50.0 5Toluene ND<50.0 1,000Ethylbenzene ND<50.0 700Xylenes ND<100 10,000

Total BTEX ND -

MTBE ND<100 401,3,5 Trimethylbenzene 2,190.1,2,4 Trimethylbenzene 2,930.Naphthalene ND<100 20

Total Targeted VOCs 5,120. -

Total Lead 1,620. 15NOTES: All values reported in ug/l (ppb) unless otherwise notedTBQ <1 - trace below quantitation limit (quantitation limit)Results reported above detection limits are indicated in boldVGES = Vermont Groundwater Enforcement Standard Values greater than the VGES (Table 1 of the Groundwater Protection Rule and Strategy ) are shaded.ND<X - Not Detected (Detection Limit); TBQ < X Trace Below Quantitation LimitNS - Not SampledNT-Not Tested

350


Brandon, Vermont

MW11-5

VTDEC Site #89-0450KAS #402050165



Benzene ND<1.0 5Toluene ND<1.0 1,000Ethylbenzene ND<1.0 700Xylenes ND<2.0 10,000

Total BTEX ND -

MTBE 23.2 401,3,5 Trimethylbenzene ND<1.01,2,4 Trimethylbenzene ND<1.0Naphthalene ND<2.0 20

Total Targeted VOCs 23.2 -

Total Lead 42 15NOTES: All values reported in ug/l (ppb) unless otherwise notedTBQ <1 - trace below quantitation limit (quantitation limit)Results reported above detection limits are indicated in boldVGES = Vermont Groundwater Enforcement Standard Values greater than the VGES (Table 1 of the Groundwater Protection Rule and Strategy ) are shaded.ND<X - Not Detected (Detection Limit); TBQ < X Trace Below Quantitation LimitNS - Not SampledNT-Not Tested

350


Brandon, Vermont

MW11-6

VTDEC Site #89-0450KAS #402050165



Benzene ND<1.0 5Toluene ND<1.0 1,000Ethylbenzene ND<1.0 700Xylenes ND<2.0 10,000

Total BTEX ND -

MTBE 2.0 401,3,5 Trimethylbenzene ND<1.01,2,4 Trimethylbenzene ND<1.0Naphthalene ND<2.0 20

Total Targeted VOCs 2.0 -

Total Lead 294. 15NOTES: All values reported in ug/l (ppb) unless otherwise notedTBQ <1 - trace below quantitation limit (quantitation limit)Results reported above detection limits are indicated in boldVGES = Vermont Groundwater Enforcement Standard Values greater than the VGES (Table 1 of the Groundwater Protection Rule and Strategy ) are shaded.ND<X - Not Detected (Detection Limit); TBQ < X Trace Below Quantitation LimitNS - Not SampledNT-Not Tested

350


Brandon, Vermont

MW11-7

VTDEC Site #89-0450KAS #402050165



Benzene ND<50.0 5Toluene ND<50.0 1,000Ethylbenzene 1,580. 700Xylenes 10,200. 10,000

Total BTEX 11,780. -

MTBE 138. 401,3,5 Trimethylbenzene 1,770.1,2,4 Trimethylbenzene 6,250.Naphthalene 1,200. 20

Total Targeted VOCs 21,138. -

Total Lead 806. 15NOTES: All values reported in ug/l (ppb) unless otherwise notedTBQ <1 - trace below quantitation limit (quantitation limit)Results reported above detection limits are indicated in boldVGES = Vermont Groundwater Enforcement Standard Values greater than the VGES (Table 1 of the Groundwater Protection Rule and Strategy ) are shaded.ND<X - Not Detected (Detection Limit); TBQ < X Trace Below Quantitation LimitNS - Not SampledNT-Not Tested

350

MW11-8


Groundwater Quality Summary

VTDEC Site #89-0450KAS #402050165


PARAMETER Trip Blank MW-2 MW-2 Duplicate RPD VGESMTBE ND<2.0 23.9 25.1 -4.9 40Benzene ND<1.0 45.7 43.9 4.0 5Toluene ND<1.0 17.2 17.3 -0.6 1000Ethylbenzene ND<1.0 13.3 12.1 9.4 700Xylenes ND<2.0 29.5 26.8 9.6 100001,3,5-TMB* ND<1.0 9.5 8.6 9.91,2,4-TMB* ND<1.0 54.8 49.7 9.8Naphthalene ND<1.0 2.9 3.4 -15.9 20Total Reported VOCs ND 197. 187. 5.2 -

NOTESResults reported above detection limits are indicated in bold ND<X - Not Detected (Detection Limit)

* TMB = Trimethyl Benzene TBQ <X = Trace Below Quantitation Limit

EPA Method 8021B used for laboratory analysis NA - Not analyzed for this parameter

All values reported in ug/l (ppb) unless otherwise noted n/a = not applicable

Values greater than the VGES are shaded.

350

Quality Assurance and Control SummaryBrandon Exxon

Brandon, VT

1/13/2011

MONITORING DATE

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 Site #89-0450KAS #402050165

Analytical Lab Reports

Laboratory Report

Brandon ExxonPROJECT:

DATE RECEIVED:

WORK ORDER:

DATE REPORTED:

100306KAS, Inc.

PO Box 787

Williston, VT 05495

Atten: Angela Emerson SAMPLER:

January 28, 2011

1101-00646

Andrea

January 17, 2011

Enclosed please find the results of the analyses performed for the samples referenced on the attached chain of custody located at the end of this report.

The column labeled Lab/Tech in the accompanying report denotes the laboratory facility where the testing was performed and the technician who conducted the assay. A "W" designates the Williston, VT lab under NELAC certification ELAP 11263; "R" designates the Lebanon, NH facility under certification NH 2037 and “N” the Plattsburgh, NY lab under certification ELAP 11892. “Sub” indicates the testing was performed by a subcontracted laboratory. The accreditation status of the subcontracted lab is referenced in the corresponding NELAC and Qual fields.

This NELAC column also denotes the accreditation status of each laboratory for each

reported parameter. “A” indicates the referenced laboratory is NELAC accredited for the parameter reported. “N” indicates the laboratory is not accredited. “U” indicates that NELAC does not offer accreditation for that parameter in that specific matrix. Test results denoted with an “A” meet all National Environmental Laboratory Accreditation Program requirements except where denoted by pertinent data qualifiers. Test results are representative of the samples as they were received at the laboratory

Endyne, Inc. warrants, to the best of its knowledge and belief, the accuracy of the analytical

test results contained in this report, but makes no other warranty, expressed or implied, especially no warranties of merchantability or fitness for a particular purpose.

Page 1 of 4

Reviewed by:

Harry B. Locker, Ph.D.Laboratory Director

NH2037 ELAP11263160 James Brown Dr., Williston, VT 05495Ph 802-879-4333 Fax 802-879-7103

www.endynelabs.com

56 Etna Road, Lebanon, NH 03766 Ph 603-678-4891 Fax 603-678-4893

Laboratory Report

KAS, Inc.CLIENT:PROJECT: Brandon Exxon

WORK ORDER:DATE RECEIVED:

1101-0064601/17/2011

1/28/2011REPORT DATE:

001 Date Sampled: 1/13/11Site: MW-2 Time:10:58

Analysis DateParameter Result NELACLab/TechUnits Qual.Method

0.014 mg/L 1/25/11 MMWW ASM19 3113BLead, Total

002 Date Sampled: 1/13/11Site: MW-3 Time:13:20



003 Date Sampled: 1/13/11Site: MW-11-5 Time:11:46












Page 2 of 4

Laboratory Report



1101-0064601/17/2011

1/28/2011REPORT DATE:TEST METHOD:

001 Sampled: 1/13/11Site: MW-2 1/18/11 KAWWTest Date:10:58Parameter Result Unit Nelac Qual Parameter Result Unit Nelac Qual

EPA 8021B

23.9 Nug/LMethyl-t-butyl ether (MTBE) 45.7 Nug/LBenzene17.2 Nug/LToluene 13.3 Nug/LEthylbenzene

29.5 Nug/LXylenes, Total 9.5 Nug/L1,3,5-Trimethylbenzene54.8 Nug/L1,2,4-Trimethylbenzene 2.9 Nug/LNaphthalene99 N%Surr. 1 (Bromobenzene) > 10 NUnidentified Peaks

TEST METHOD:

002 Sampled: 1/13/11Site: MW-3 1/17/11 KAWWTest Date:13:20Parameter Result Unit Nelac Qual Parameter Result Unit Nelac Qual

EPA 8021B

61.1 Nug/LMethyl-t-butyl ether (MTBE) 15.8 Nug/LBenzene< 10.0 Nug/LToluene < 10.0 Nug/LEthylbenzene36.3 Nug/LXylenes, Total 196 Nug/L1,3,5-Trimethylbenzene

530 Nug/L1,2,4-Trimethylbenzene < 20.0 Nug/LNaphthalene104 N%Surr. 1 (Bromobenzene) > 10 NUnidentified Peaks

TEST METHOD:

003 Sampled: 1/13/11Site: MW-11-5 1/21/11 KAWWTest Date:11:46Parameter Result Unit Nelac Qual Parameter Result Unit Nelac Qual

EPA 8260B

< 100 Aug/LMethyl-t-butyl ether (MTBE) < 50.0 Aug/LBenzene< 50.0 Aug/LToluene < 50.0 Aug/LEthylbenzene< 100 Aug/LXylenes, Total 2,190 Aug/L1,3,5-Trimethylbenzene2,930 Aug/L1,2,4-Trimethylbenzene < 100 Aug/LNaphthalene

94 A%Surr. 1 (Dibromofluoromethane) 97 A%Surr. 2 (Toluene d8)98 A%Surr. 3 (4-Bromofluorobenzene) > 10 UUnidentified Peaks

TEST METHOD:


EPA 8021B

23.2 Nug/LMethyl-t-butyl ether (MTBE) < 1.0 Nug/LBenzene< 1.0 Nug/LToluene < 1.0 Nug/LEthylbenzene< 2.0 Nug/LXylenes, Total < 1.0 Nug/L1,3,5-Trimethylbenzene< 1.0 Nug/L1,2,4-Trimethylbenzene < 2.0 Nug/LNaphthalene

109 N%Surr. 1 (Bromobenzene) 0 NUnidentified Peaks

TEST METHOD:

005 Sampled: 1/13/11Site: Trip Blank 1/17/11 KAWWTest Date: 8:17Parameter Result Unit Nelac Qual Parameter Result Unit Nelac Qual

EPA 8021B

< 2.0 Nug/LMethyl-t-butyl ether (MTBE) < 1.0 Nug/LBenzene< 1.0 Nug/LToluene < 1.0 Nug/LEthylbenzene< 2.0 Nug/LXylenes, Total < 1.0 Nug/L1,3,5-Trimethylbenzene< 1.0 Nug/L1,2,4-Trimethylbenzene < 2.0 Nug/LNaphthalene109 N%Surr. 1 (Bromobenzene) 0 NUnidentified Peaks

TEST METHOD:

006 Sampled: 1/13/11Site: Duplicate 1/17/11 KAWWTest Date:10:58Parameter Result Unit Nelac Qual Parameter Result Unit Nelac Qual

EPA 8021B

25.1 Nug/LMethyl-t-butyl ether (MTBE) 43.9 Nug/LBenzene17.3 Nug/LToluene 12.1 Nug/LEthylbenzene26.8 Nug/LXylenes, Total 8.6 Nug/L1,3,5-Trimethylbenzene49.7 Nug/L1,2,4-Trimethylbenzene 3.4 Nug/LNaphthalene102 N%Surr. 1 (Bromobenzene) > 10 NUnidentified Peaks

Page 3 of 4

Laboratory Report



1101-0064601/17/2011

1/28/2011REPORT DATE:TEST METHOD:


EPA 8021B

2.0 Nug/LMethyl-t-butyl ether (MTBE) < 1.0 Nug/LBenzene< 1.0 Nug/LToluene < 1.0 Nug/LEthylbenzene

< 2.0 Nug/LXylenes, Total < 1.0 Nug/L1,3,5-Trimethylbenzene< 1.0 Nug/L1,2,4-Trimethylbenzene < 2.0 Nug/LNaphthalene107 N%Surr. 1 (Bromobenzene) 0 NUnidentified Peaks

TEST METHOD:


EPA 8021B

138 Nug/LMethyl-t-butyl ether (MTBE) < 50.0 Nug/LBenzene< 50.0 Nug/LToluene 1,580 Nug/LEthylbenzene10,200 Nug/LXylenes, Total 1,770 Nug/L1,3,5-Trimethylbenzene

6,250 Nug/L1,2,4-Trimethylbenzene 1,200 Nug/LNaphthalene107 N%Surr. 1 (Bromobenzene) > 10 NUnidentified Peaks

Page 4 of 4

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