Former Exit 8 Mobil / Irving Oil Corp

PROJECT PHASE SUBMITTAL TYPE (check one) (check one) ¨ Site Investigation ¨ Work Scope ¨ Corrective Action Feasibility Investigation x Technical Report ¨ Corrective Action Plan ¨ PCF Reimbursement Request ¨ Corrective Action Summary Report ¨ General Correspondence x Operations & Monitoring Report

MAY 2015 GROUNDWATER MONITORING REPORT FORMER EXIT 8 MOBIL / IRVING OIL CORP. PROPERTY #72619 ROUTE 131 / I-91 ASCUTNEY, VERMONT SMS #98-2524

Prepared for:

Irving Oil 1 Germain Street, Brunswick Square, 7th Floor Saint John, NB Canada E2L 4V1 Contact: Erin Norton Tel: (506) 202-3269 email: [email protected]

Prepared by:

GeoInsight, Inc. 186 Granite Street, 3rd Floor, Suite A Manchester, New Hampshire 03101 Contact: Darrin L. Santos, P.G. Tel: (603) 314-0820 email: [email protected]

September 2, 2015

GeoInsight Project 5650-000 File: 5650/CAP-CVR September 2, 2015 GeoInsight Project 5650-000

Gerold Noyes, P.E. Sites Management Section Vermont Department of Environmental Conservation 1 National Life Drive – Davis 1 Montpelier, VT 05626-3704

RE: May 2015 Groundwater Monitoring Report Former Exit 8 Mobil / Irving Oil Corp. Property #72619 – SMS #98-2524 Route 131 / I-91 Ascutney, Vermont

Dear Mr. Noyes:

At the request of Irving Oil Corporation, GeoInsight, Inc. (GeoInsight) prepared this report summarizing the May 2015 groundwater monitoring event performed at the Former Exit 8 Mobil / Irving Oil Corp. Property (#72619) located at Route 131 / I-91 in Ascutney, Vermont. A site locus map is presented as Figure 1 and a site plan is presented as Figure 2.

The scope of work and associated costs for these activities were presented in a Work Plan Budget Sheet dated February 19, 2009, which was approved by the Vermont Department of Environmental Conservation (VTDEC) in a letter dated February 25, 2009, and amended by the VTDEC in a letter dated August 10, 2010. The monitoring program was changed from annual to biennial sampling in a VTDEC letter dated October 12, 2011 (the last monitoring event was performed in May 2013).

GROUNDWATER MONITORING

Sampling and Analysis

GeoInsight performed a groundwater monitoring event at the site on May 21, 2015. During the event, groundwater elevations were gauged from seven monitoring wells (MW99-2, MW99-3, MW99-6, MW99-4, MW99-7, MW00-8, MW00-11 HA-1, HA-2, and HA-3). Groundw ater elevations were measured using an electronic water level meter. Groundwater gauging data is summarized in Table 1.

Groundwater samples were collected from wells MW99-2, MW99-3, MW99-6, MW99-7, and HA-2 using new dedicated, disposable polyethylene bailers. Prior to sample collection, at least three times the volume of water in the wells was purged using the bailers or the wells were

GeoInsight, Inc. GeoInsight, Inc. GeoInsight, Inc. 186 Granite Street, 3rd Floor, Suite A One Monarch Drive, Suite 201 200 Court Street, 2nd Floor Manchester, NH 03101-2643 Littleton, MA 01460-1440 Middletown, CT 06457-3341 Tel (603) 314-0820 Tel (978) 679-1600 Tel (860) 894-1022 Fax (603) 314-0821 Fax (978) 679-1601 Fax (860) 894-1023 www.geoinsightinc.com ®

purged dry. After a short stabilization period (approximately 30 minutes), groundwater samples were collected from the monitoring wells for analyses of volatile organic compounds (VOCs).

The groundwater samples were analyzed by United States Environmental Protection Agency (USEPA) Method 8260B, but were reported using the VTDEC USEPA Method 8021 list of selected petroleum constituents. Table 2 provides a current and historical summary of ground water VOC data for the site. The laboratory analytical report for the May 2015 monitoring event is presented in Attachment A. An updated discussion of groundwater impacts at the site is provided in the Updated Conceptual Model section of this report.

Quality Assurance/Quality Control

GeoInsight included a trip blank sample during the May 2015 monitoring event to evaluate sampling quality assurance and quality control. GeoInsight also reviewed the surrogate recovery data reported by the laboratory for the May 2015 monitoring event, which were within the acceptable limits listed by the laboratory in the analytical reports. VOCs were not detected above the laboratory reporting limits in the trip blank sample submitted for the May 2015 monitoring event. The trip blank sample was comprised of a laboratory-prepared VOC vial containing deionized water, which accompanied the sample containers in a cooler from delivery from the laboratory through sample receipt by the laboratory.

UPDATED CONCEPTUAL MODEL

Groundwater Elevations and Flow Direction

Using the groundwater elevation data collected in May 2015, GeoInsight plotted groundwater elevation contours, which are presented on Figure 3. The observed groundwater flow pattern for May 2015 indicated groundwater flow was generally directed to the east and northeast, toward Route 131 and the stream located northeast of the site. This groundwater flow pattern was generally consistent with historical observations. Groundwater elevations for on-site wells MW99-2, MW99-3, MW99-6, and MW99-7 were generally consistent with the lower elevations on record (the groundwater elevations in wells HA-1, HA-2, and HA-3, which are immediately adjacent to the stream northeast of the site, do not fluctuate as significantly).

Constituent Concentrations and Dissolved-Phase Plume

During the May 2015 monitoring event, VOCs were detected at concentrations exceeding the Vermont Primary Groundwater Enforcement Standards (VPGESs) in the groundwater sample collected from wells MW99-3 and MW99-6 only. The only other groundwater sample to show detections of VOCs above laboratory reporting limits was the sample collected from monitoring well MW99-7, with 3 micrograms per liter (µg/L) of toluene, 57 µg/L of xylenes, and 14 µg/L of naphthalene. VOCs were not detected above laboratory reporting limits in samples collected in the remaining on-site and off-site monitoring wells. During May 2013 (last event prior to 2015), VOCs were detected at concentrations above VPGESs at on-site well MW99-3.

September 2, 2015 GeoInsight Project 5650-000 Page 2 ®

Bas ed upon the recent and historical data (Table 2), VOC concentrations are highest at mon itoring well MW99-3 (7,321 µg/L total detected VOCs in 2013; total detected VOCs 32,707 µg/L in 2015). VOCs detected at monitoring well MW-99-6, while variable during recent moni toring events, have also exhibited relatively high total VOC concentrations recently.

Conc entrations of benzene, methyl tertiary butyl ether (MTBE), and naphthalene detected in ground water samples during May 2015 were plotted on Figure 4 along with inferred dissolved plume iso-contours. The iso-contours from the May 2013 monitoring event are also plotted on Figure 4 for comparison. As the figure illustrates, the dissolved plume extends from the vicinity of the plume center of mass located near well MW99-3, downgradient toward off-site monitoring well HA-2, consistent with expected migration pathways based upon historical groundwater flow patterns.

Charts illustrating benzene and MTBE concentrations in select wells are presented in Attachment B. The data plotted on the chart for well MW99-3 (in the plume center of mass) exhibit a moderate trend of exponential decay over the monitoring history, as indicated by regression coefficient (R2) values of 0.66 and 0.68, respectively, for the exponential curves fitted to benzene and MTBE data. The MTBE data plotted for on-site well MW99-6 and off-site monitoring well HA-2 also exhibit moderate exponential decay trends (Attachment B).

CONCLUSIONS AND RECOMMENDATIONS

VOC concentrations increased between the May 2013 and May 2015 sampling events primarily in the groundwater collected from well MW99-3. There was an also a slight increase in VOC concentrations detected in groundwater collected rom well MW99-6. It is too early to conclude if these higher concentrations represent the migrating of the plume or short-term conditions (possibly resulting from high groundwater elevations). Historically, benzene and MTBE concentrations exhibit decreasing trends at well MW99-3 and the leading edge of the dissolved plume near the stream downgradient of the site appears to be contracting.

Based upon the increases noted in 2015, GeoInsight recommends groundwater monitoring be increased to an annual basis for 2016 only to evaluate recent variable VOC trends.

September 2, 2015 GeoInsight Project 5650-000 Page 3 ®

If you have questions regarding the contents of this letter report, please contact us at (603) 314-0820.

Sincerely, GEOINSIGHT, INC.

Darrin L. Santos, P.G. Brian D. Kisiel, P.G. Senior Geologist President

Attachments cc: Erin Norton, Irving Oil Corporation George Lamb

P:\5650 Irving Oil Ascutney VT\May 2013\5650May2013Rpt.doc

September 2, 2015 GeoInsight Project 5650-000 Page 4 ®

FIGURES Site

GeoInsight Practical in Nature GeoInsight Practical in Nature GeoInsight Practical in Nature GeoInsight Practical in Nature

TABLES

TABLE 1 SUMMARY OF GROUND WATER ELEVATIONS FORMER EXIT 8 MOBIL / IRVING OIL CORP. PROPERTY #72619 ROUTE 131 / I-91 ASCUTNEY, VERMONT SMS #98-2524

Well Depth Top of Well I.D. FT-BGS Casing Elevation MW99-1 25 498.99 MW99-2 30 497.57 MW99-3 30 495.35 MW99-4 33 497.77 MW99-5 30.5 497.96 MW99-6 30.5 492.29 MW99-7 30 489.81 MW00-8 35 498.24 MW00-9 35 496.22 MW00-10 35 497.69 MW00-11 53 498.03 HA-1 7 466.88 HA-2 7 465.42 HA-3 7 466.92

Well I.D. 5/28/1999 6/23/1999 7/22/1999 9/1/1999 10/14/1999 11/11/1999 12/9/1999 1/13/2000 2/3/2000 3/28/2000 MW99-1 DRY DRY DRY DRY DRY DRY - - - - MW99-2 469.60 468.85 468.42 468.17 468.13 468.23 468.47 468.78 468.78 470.63 MW99-3 468.82 467.99 467.69 466.69 467.01 467.31 467.44 467.73 467.83 470.95 MW99-4 469.09 468.81 468.13 467.26 467.72 467.88 468.17 468.52 468.47 470.31 MW99-5 468.88 - 469.49 469.95 469.87 472.43 Monitoring wells MW99-5, 6, and 7 installed MW99-6 464.25 - 464.91 465.26 465.26 - October 6, 1999. MW99-7 462.33 - 462.62 462.89 462.80 464.25

Well I.D. 4/3/2000 4/25/2000 4/28/2000 5/1/2000 5/12/2000 5/25/2000 5/31/2000 6/5/2000 6/14/2000 6/26/2000 MW99-1 ------MW99-2 - - 472.29 473.21 ------MW99-3 470.50 - 473.00 472.58 472.40 472.60 471.47 470.81 - 470.33 MW99-4 - - - 472.55 ------MW99-5 - - - 474.96 ------MW99-6 - - - 469.35 ------MW99-7 - - - 467.14 ------

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Well I.D. 7/18/2000 7/31/2000 8/15/2000 9/6/2000 9/20/2000 12/21/2000 2/1/2001 7/3/2001 10/4/2001 11/6/2001 MW99-1 ------MW99-2 - 470.09 469.57 469.12 471.02 468.92 469.12 471.58 < 468.18 469.04 MW99-3 469.84 468.83 468.97 465.79 468.14 467.91 467.96 470.63 < 465.93 467.93 MW99-4 - 469.26 469.26 470.85 - 468.57 - 471.02 468.70 468.69 MW99-5 - 470.39 470.41 469.94 - 470.04 - 472.65 469.67 - MW99-6 - 466.24 466.26 465.73 - 465.54 - 467.69 465.74 465.36 MW99-7 - 463.71 463.76 463.26 - 463.67 - 465.20 463.41 463.08 MW00-8 - 469.54 - 469.38 - - - 469.14 MW00-9 Monitoring wells - 468.08 - 468.00 - 470.20 468.28 468.29 MW00-8, 9, 10, and 11 not MW00-10 - - 469.26 - 471.27 469.04 - installed June 26 and surveyed MW00-11 July 18, 2000. - 461.71 - 465.58 - 467.73 465.41 - HA-1 Monitoring wells - 460.88 - 461.77 - - 461.17 - HA-2 HA-1, 2, and 3 installed - 460.52 - 461.27 - - 461.04 - August 31, 2000. HA-3 - 460.13 - 461.08 - - 460.70 -

Well I.D. 1/3/2002 4/2/2002 7/9/2002 8/5/2002 8/20/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 MW99-1 ------MW99-2 468.67 470.17 470.74 469.57 468.85 468.42 468.64 470.10 469.84 470.72 MW99-3 467.66 470.29 469.61 468.38 468.03 466.79 467.71 470.19 469.43 468.96 MW99-4 468.22 470.35 470.06 - - 467.62 468.57 469.86 468.84 469.87 MW99-5 469.20 472.11 471.29 - - 468.51 - 472.93 470.87 471.17 MW99-6 465.60 465.85 466.17 - - 464.15 - 465.95 465.14 466.27 MW99-7 462.93 463.98 463.38 - - 461.92 460.12 463.62 462.79 466.38 MW00-8 468.82 - 470.64 ------MW00-9 467.87 469.21 469.67 - - 465.55 - 468.02 467.55 468.09 MW00-10 468.51 ------MW00-11 473.89 466.87 465.79 - - 464.13 465.36 466.86 465.93 466.38 HA-1 461.14 461.70 460.87 - - 460.67 460.94 461.56 460.90 461.32 HA-2 460.95 461.38 460.74 - - 460.41 460.67 461.23 460.68 461.10 HA-3 460.57 461.36 460.31 - - 460.07 460.27 461.25 460.32 460.75

Well I.D. 1/5/2004 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 10/20/2006 MW99-1 ------MW99-2 475.41 470.79 470.73 470.21 - 475.25 - - 472.87 - MW99-3 475.47 475.08 470.88 469.09 469.90 474.87 472.80 467.62 473.12 469.79 MW99-4 474.56 471.71 470.34 470.03 ------MW99-5 477.02 472.86 471.32 471.14 - 476.95 - - - - MW99-6 470.91 466.52 466.38 466.30 467.01 471.04 467.09 464.91 466.09 - MW99-7 467.45 464.91 463.21 463.98 465.01 467.74 465.04 462.73 466.46 464.83 MW00-8 ------MW00-9 473.27 470.55 471.10 468.55 ------MW00-10 ------MW00-11 472.59 469.08 467.03 466.57 - 469.00 - - - - HA-1 461.96 461.50 461.08 461.23 461.43 461.71 461.21 460.80 - 461.57 HA-2 461.52 461.33 461.05 461.12 461.36 461.50 461.10 460.63 - 461.37 HA-3 461.49 461.22 460.74 460.78 - 461.50 - - - -

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Well I.D. 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 5/16/2011 5/25/2013 5/21/2015 MW99-1 ------MW99-2 473.28 - 488.15 - 474.62 473.05 475.31 469.19 471.24 MW99-3 473.94 467.80 476.55 470.63 474.10 472.54 474.95 470.08 471.77 MW99-4 ------MW99-5 ------MW99-6 468.29 465.37 473.19 467.62 471.31 469.68 471.15 465.33 467.00 MW99-7 466.66 464.12 469.22 466.70 467.55 467.79 467.69 464.46 466.14 MW00-8 ------471.90 MW00-9 ------MW00-10 ------MW00-11 ------471.74 HA-1 458.60 461.30 459.03 461.73 462.03 461.87 461.18 461.39 461.56 HA-2 461.41 460.51 460.78 461.51 461.73 461.57 461.05 461.01 461.26 HA-3 461.49 461.39 461.90 - 461.55 461.38 461.15 460.79 461.10 NOTES: 1) Elevations reported in feet relative to a site benchmark with an assigned elevation of 500 feet (established at the top east corner of the cement walk entrance to the convenience store). 2) FT-BGS = feet-below ground surface; DRY = well was dry during monitoring event; - = data not available or data not collected during monitoring event. 3) Data collected prior to October 2008 and well casing elevations were obtained from an April 2008 Annual Groundwater Monitoring Report prepared by KAS, Inc. and dated April 29, 2008.

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MONITORING WELL MW99-2 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene 3,580 11,100 Toluene 6,440 Not 16,200 Not Not Not Not Not Ethylbenzene 151 sampled. 2,060 sampled. sampled. sampled. sampled. sampled. Xylenes 2,820 12,600 MtBE 2,130 6,880 Insufficient Free Insufficient Free Free Free 1,3,5-TMB ND(100) 621 water in product in water in product in product in product in 1,2,4-TMB 346 1,740 well. well. well. well. well. well. Naphthalene ND(100) 371

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene ND(100) 20.4 10.5 ND(2) ND(5) ND(1) 8.2 11.7 Toluene 1,940 ND(10) 7 5 40 2 ND(5) 208 Ethylbenzene 606 ND(10) 20 ND(2) 17 ND(1) ND(5) 36 Xylenes 8,420 626 118 30 161 5 ND(10) 706 MtBE ND(200) ND(20) 11 ND(4) ND(10) 6 ND(10) 37 1,3,5-TMB 864 379 82 42 101 34 16 87 1,2,4-TMB 3,030 866 130 52 193 44 17 158 Naphthalene 437 41 5 9 50 1 ND(5) 22

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene ND(1) ND(1) ND(1) ND(5) 18 Toluene ND(1) ND(1) ND(1) 33 9 Ethylbenzene ND(1) ND(1) ND(1) Not 40 Not Not ND(5) Xylenes ND(2) ND(2) ND(2) sampled. On 1,740 sampled. On sampled. On 244 MtBE ND(2) 2.4 ND(2) annual 90 annual annual 20 1,3,5-TMB ND(1) ND(1) ND(1) schedule. 101 schedule. schedule. 84 1,2,4-TMB ND(1) ND(1) ND(1) 285 160 Naphthalene ND(2) ND(1) ND(2) 36 ND(10)

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene 40.9 360 71 10 5 Toluene 6.1 94 11 3 1,000 Ethylbenzene Not ND(5) Not 76.5 Not ND(10) ND(2) 700 Xylenes sampled. On 91 sampled. On 4,630 sampled. On 800 70 10,000 MtBE annual 264 annual 5,590 annual 240 45 40 1,3,5-TMB schedule. 12 schedule. 994 schedule. 270 110 350 1,2,4-TMB 19.7 2,710 680 210 Naphthalene ND(10) 625 120 79 20

Sample Date / 5/16/2011 5/25/2013 5/21/2015 VPGES Analyte Benzene 38 ND(2) ND(2) 5 Toluene 15 ND(2) ND(2) 1,000 Ethylbenzene 8 ND(2) ND(2) 700 Xylenes 830 ND(4) ND(4) 10,000 MtBE 54 ND(2) ND(2) 40 1,3,5-TMB 650 ND(2) ND(2) 350 1,2,4-TMB 1,600 ND(2) ND(2) Naphthalene 360 ND(5) ND(5) 20

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MONITORING WELL MW99-3 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene Toluene Not Not Not Not Not Not Not Not Ethylbenzene sampled. sampled. sampled. sampled. sampled. sampled. sampled. sampled. Xylenes MtBE Free Insufficient Free Free Insufficient Free Free Free 1,3,5-TMB product in water in product in product in water in product in product in product in 1,2,4-TMB well. well. well. well. well. well. well. well. Naphthalene

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene 9,970 18,900 5,310 2,440 3,520 6,440 4,890 9,430 Toluene 29,500 28,700 11,700 6,090 5,980 12,200 9,440 21,600 Ethylbenzene 3,330 777 925 257 251 370 333 2,460 Xylenes 23,500 15,000 6,800 4,760 9,050 8,440 7,220 19,300 MtBE 18,600 73,400 28,200 8,180 1,830 16,600 1,130 7,150 1,3,5-TMB 1,360 537 292 499 1,160 813 457 852 1,2,4-TMB 5,620 2,480 1,300 1,640 3,740 2,370 1,560 4,180 Naphthalene 1,500 543 341 441 1,350 800 331 849

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene 519 11,000 7,160 ND(100) 5,600 296 1,660 Toluene 1,320 33,500 16,800 1,610 28,900 4,320 23,100 Ethylbenzene 392 2,240 1,930 589 2,050 1,300 1,810 Xylenes 3,140 Not 21,000 15,400 5,440 14,300 8,320 11,400 MtBE 135 sampled. 533 ND(400) ND(200) ND(1,000) ND(200) ND(400) 1,3,5-TMB 107 753 786 431 828 840 2,716 1,2,4-TMB 561 2,780 2,790 1,410 2,240 2,710 Naphthalene 82.9 381 413 263 667 660 ND(400)

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene 591 750 ND(200) 322 270 250 210 5 Toluene 17,300 18,500 3,630 17,600 24,000 4,000 15,000 1,000 Ethylbenzene 1,850 2,090 1,530 1,880 2,400 1,100 2,500 700 Xylenes 11,000 11,800 10,300 11,500 12,500 6,600 13,500 10,000 MtBE ND(400) ND(400) ND(400) ND(400) 170 ND(20) 240 40 1,3,5-TMB 620 600 890 3,405 5,393 3,636 1,944 350 1,2,4-TMB 2,200 2,300 3,200 Naphthalene 465 757 572 642 270 310 480 20

Sample Date / 5/16/2011 5/25/2013 5/21/2015 VPGES Analyte Benzene 140 20 47 5 Toluene 15,000 1,700 15,000 1,000 Ethylbenzene 2,500 220 1,700 700 Xylenes 13,700 4,600 12,700 10,000 MtBE ND(100) ND(10) ND(20) 40 1,3,5-TMB 920 220 570 350 1,2,4-TMB 3,200 530 2,300 Naphthalene 1,480 31 390 20

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MONITORING WELL MW99-6 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene 10,200 5,690 5,810 7,870 13,100 4,390 4,950 Toluene Not 25,500 10,300 12,800 23,400 39,100 13,800 18,400 Ethylbenzene sampled. 1,750 768 1,060 2,010 2,690 1,120 1,200 Xylenes 11,400 6,100 8,040 12,500 16,800 8,980 11,100 MtBE Monitoring 6,060 1,970 ND(2,000) ND(2,000) 33,900 ND(1,000) ND(1,000) 1,3,5-TMB well 426 ND(200) 303 553 822 362 448 1,2,4-TMB installed 1,390 875 1,070 1,610 2,380 1,220 1,340 Naphthalene 10/6/99. 330 707 364 535 564 244 405

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene 566 36.4 70 7.6 2.8 ND(1) 740 Toluene 1,100 14.6 61.2 Could not 4.9 ND(1) ND(1) 2,490 Ethylbenzene 193 10 6.9 locate 8.1 1.3 ND(1) 139 Xylenes 1,630 123 186 monitoring 169 25.7 ND(2) 1,510 MtBE 229 110 198 well, 38.2 6.2 11.7 1,850 1,3,5-TMB 53.4 6.6 10.7 under 8.9 2.5 ND(1) 54 1,2,4-TMB 289 29.5 11.5 snow bank. 23 6 ND(1) 177 Naphthalene 132 16.2 ND(4) 5.5 2.2 ND(2) 27

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene 12.3 6.3 36.1 110 34.5 ND(20) ND(20) 25 Toluene 24.2 21.8 64 201 7.1 169 32.3 19.2 Ethylbenzene 4.6 ND(5) 5.9 ND(5) ND(5) 70.5 ND(20) ND(10) Xylenes 185 375 1,380 1,140 62.2 3,130 1,070 179 MtBE 28.6 13.1 61.3 100 177 ND(40) ND(40) ND(20) 1,3,5-TMB 12.3 5.6 67.7 134 6.6 245 49 200 1,2,4-TMB 25.7 23.9 183 225 11.9 661 112 Naphthalene 3.2 21.6 33.9 25.1 ND(5) 69.5 29.8 ND(20)

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene 1,200 ND(100) 65.1 110 840 320 5 Toluene 8,990 347 17 850 5,200 1,900 1,000 Ethylbenzene Could not 774 ND(100) 5.7 520 1,200 630 700 Xylenes sample, 4,920 1,590 134 2,930 6,500 4,300 10,000 MtBE well under ND(200) ND(200) ND(4) 100 ND(10) ND(10) 40 1,3,5-TMB water. 183 8.4 460 390 270 1,192 350 1,2,4-TMB 499 29.5 1,300 1,600 1,100 Naphthalene ND(200) ND(200) 6.8 320 290 190 20

Sample Date / 5/16/2011 5/25/2013 5/21/2015 VPGES Analyte Benzene 31 ND(2) 8 5 Toluene 2 ND(2) 110 1,000 Ethylbenzene ND(2) ND(2) 40 700 Xylenes 30 ND(4) 1,670 10,000 MtBE ND(2) ND(2) ND(2) 40 1,3,5-TMB 16 ND(2) 83 350 1,2,4-TMB 39 ND(2) 330 Naphthalene 54 ND(5) 170 20

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MONITORING WELL MW99-7 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene 440 61.1 2,480 623 3,930 985 1,200 Toluene Not 536 70.1 4,450 532 8,800 1,190 375 Ethylbenzene sampled. ND(50) ND(20) ND(200) 29.9 721 42.2 ND(50) Xylenes 745 ND(20) 1,470 290 4,910 607 457 MtBE 2,870 1,430 13,700 2,690 5,940 2,790 3,380 Monitoring 1,3,5-TMB 63.8 ND(20) ND(200) 24.2 263 41 ND(50) well installed 1,2,4-TMB 86.5 ND(20) ND(200) 44.7 749 84.5 102 10/6/99. Naphthalene ND(50) ND(20) ND(200) ND(20) 166 21.3 ND(50)

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene 233 ND(20) ND(50) ND(1) ND(200) ND(50) ND(20) 1,690 Toluene 50.8 ND(20) ND(50) ND(1) ND(200) ND(50) ND(20) 1,530 Ethylbenzene ND(20) ND(20) ND(50) ND(1) ND(200) ND(50) ND(20) 130 Xylenes 60.4 ND(40) ND(100) ND(2) ND(400) ND(100) ND(40) 2,600 MtBE 1,680 2,900 5,800 121 11,300 4,630 3,050 2,740 1,3,5-TMB ND(20) ND(20) ND(50) ND(1) ND(200) ND(50) ND(20) 163 1,2,4-TMB ND(20) ND(20) ND(50) ND(1) ND(200) ND(50) ND(20) 521 Naphthalene ND(100) ND(20) ND(50) ND(2) ND(200) ND(50) ND(20) 131

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene 67.2 17.8 158 140 1,410 78 1 775 Toluene 29.5 ND(10) 52.3 21.4 8,510 13 ND(1) 807 Ethylbenzene ND(10) ND(10) 10.3 7.5 781 ND(5) 7 170 Xylenes 309 ND(20) 269 195 7,090 177 6 2,110 MtBE 1,300 743 748 175 335 36 24 ND(100) 1,3,5-TMB 22.4 ND(10) 27.8 21.9 403 13 ND(1) 679 1,2,4-TMB ND(10) ND(10) 25.8 34.2 1,410 29 1 --- Naphthalene ND(10) ND(10) ND(10) 6.8 217 9.6 1.4 102

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene 360 371 29.7 404 110 340 69 5 Toluene 56.1 979 13 2,960 600 2,900 340 1,000 Ethylbenzene 18.4 217 ND(2) 610 26 700 370 700 Xylenes 778 2,340 263 4,500 1,660 5,000 2,650 10,000 MtBE 61.9 130 112 86.4 260 110 130 40 1,3,5-TMB --- 963 --- 249 220 340 370 350 1,2,4-TMB 326 --- 27.9 891 930 1,400 1,300 Naphthalene 82.8 116 38.4 224 190 270 210 20

Sample Date / 5/16/2011 5/25/2013 5/21/2015 VPGES Analyte Benzene 49 ND(2) ND(2) 5 Toluene 980 ND(2) 3 1,000 Ethylbenzene 190 ND(2) ND(2) 700 Xylenes 2,700 ND(4) 57 10,000 MtBE 18 ND(2) ND(2) 40 1,3,5-TMB 220 ND(2) ND(2) 350 1,2,4-TMB 790 ND(2) ND(2) Naphthalene 140 ND(5) 14 20

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MONITORING WELL HA-1 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene 2.4 ND(1) ND(1) ND(1) 1.8 Toluene 1.2 ND(1) ND(1) ND(1) 3.1 Not sampled. Ethylbenzene ND(1) ND(1) ND(1) ND(1) ND(1) Xylenes ND(1) ND(1) ND(1) ND(1) 5.2 MtBE 57.1 24.2 16.4 25.7 17.1 1,3,5-TMB ND(1) ND(1) ND(1) ND(1) ND(1) Monitoring well installed 8/31/00. 1,2,4-TMB ND(1) ND(1) ND(1) ND(1) ND(1) Naphthalene ND(1) ND(1) ND(1) ND(1) ND(1)

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene ND(1) ND(1) ND(1) ND(1) Toluene ND(1) ND(1) ND(1) ND(1) Ethylbenzene ND(1) Not ND(1) Not ND(1) Not ND(1) Not Xylenes ND(2) sampled. On ND(2) sampled. On ND(2) sampled. On ND(2) sampled. On MtBE 12.8 semi-annual 10.5 semi-annual 6.2 semi-annual 8.5 semi-annual 1,3,5-TMB ND(1) schedule. ND(1) schedule. ND(1) schedule. ND(1) schedule. 1,2,4-TMB ND(1) ND(1) ND(1) ND(1) Naphthalene ND(2) ND(2) ND(2) ND(2)

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene ND(1) 108 ND(1) 1.2 ND(1) ND(1) ND(1) Toluene ND(1) 3.3 ND(1) 1.7 ND(1) ND(1) ND(1) Ethylbenzene ND(1) Not 9.2 ND(1) ND(1) ND(1) ND(1) ND(1) Xylenes ND(2) sampled. On 80.4 ND(2) 3.7 ND(2) ND(2) ND(2) MtBE 2.4 semi-annual 58.9 8.3 2.6 ND(2) ND(2) ND(2) 1,3,5-TMB ND(1) schedule. 5 ND(1) ND(1) ND(1) ND(1) ND(1) 1,2,4-TMB ND(1) 23.1 ND(1) ND(1) ND(1) ND(1) ND(1) Naphthalene ND(2) 5.9 ND(1) ND(1) ND(2) ND(1) ND(2)

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene 11.1 ND(1) ND(1) ND(1) ND(2) ND(2) ND(2) 5 Toluene 12.5 ND(1) ND(1) ND(1) ND(2) ND(2) ND(2) 1,000 Ethylbenzene 3.6 ND(1) ND(1) ND(1) ND(2) ND(2) ND(2) 700 Xylenes 42.8 2.4 ND(2) ND(2) ND(4) ND(2) ND(2) 10,000 MtBE ND(2) ND(2) ND(2) ND(2) ND(2) ND(2) ND(2) 40 1,3,5-TMB 3.9 ND(1) ND(1) ND(1) ND(2) ND(2) ND(2) 350 1,2,4-TMB 4.7 ND(1) ND(1) ND(1) ND(2) ND(2) ND(2) Naphthalene ND(2) ND(2) ND(2) ND(2) ND(5) ND(5) ND(5) 20

Sample Date / 5/16/2011 5/25/2013 5/21/2015 VPGES Analyte Benzene ND(2) ND(2) 5 Toluene ND(2) ND(2) 1,000 Ethylbenzene ND(2) ND(2) 700 Xylenes ND(2) ND(4) Not 10,000 MtBE ND(2) ND(2) sampled. 40 1,3,5-TMB ND(2) ND(2) 350 1,2,4-TMB ND(2) ND(2) Naphthalene ND(5) ND(5) 20

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MONITORING WELL HA-2 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene 1,650 1,090 1,000 385 297 Toluene 2,640 529 1,430 107 31.5 Not sampled. Ethylbenzene 217 180 123 18 15.2 Xylenes 2,230 1,220 1,450 146 113 MtBE 2,110 1,330 1,010 619 344 1,3,5-TMB 133 183 95.6 12 27.4 Monitoring well installed 8/31/00. 1,2,4-TMB 478 513 296 79.5 73.5 Naphthalene 113 136 80.7 19.9 16.7

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene 234 857 296 463 150 7.6 28.5 714 Toluene 112 434 7.4 15.4 6.6 ND(5) 1.6 649 Ethylbenzene 29.7 51.7 ND(4) ND(5) ND(5) ND(5) ND(1) ND(50) Xylenes 274 366 18.5 40.5 11.7 ND(10) 8.1 1,960 MtBE 263 490 153 387 238 226 153 524 1,3,5-TMB 45.9 49.1 10.7 9.9 7.2 ND(5) 2.3 103 1,2,4-TMB 126 108 36 30.4 6.6 ND(5) 9.6 418 Naphthalene 27.2 27.5 16.1 6.6 6 ND(5) 1.5 96.2

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene 1,620 111 1.1 130 237 214 205 611 Toluene 90.7 7.5 ND(1) 19.7 63.6 93.4 8.7 880 Ethylbenzene 68.1 ND(5) ND(1) 23.5 44.4 72.1 56.5 415 Xylenes 1,530 75.6 3.5 249 610 232 185 845 MtBE 2,490 101 10.6 57.3 77.2 25 12.3 ND(100) 1,3,5-TMB 212 ND(5) ND(1) 15.6 11.8 15.7 15.9 694 1,2,4-TMB 485 38.2 ND(1) 74.7 160 92.3 52.5 Naphthalene 166 7.3 ND(2) 18.7 26.6 14.5 32.5 105

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene 488 249 248 56.4 42 6 42 5 Toluene 9.7 26.9 ND(1) 11.3 ND(2) ND(2) 16 1,000 Ethylbenzene 131 119 20.5 21.4 ND(2) ND(2) ND(2) 700 Xylenes 125 47.4 ND(2) 528 ND(4) 4 21 10,000 MtBE 20.7 ND(20) ND(2) ND(10) ND(2) ND(2) ND(2) 40 1,3,5-TMB ND(2) 4 35 44 67.9 5.4 140.4 350 1,2,4-TMB ND(2) 14 34 Naphthalene 117 50 38.4 15.1 11 6 77 20

Sample Date / 5/16/2011 5/25/2013 5/21/2015 VPGES Analyte Benzene 3 4 ND(2) 5 Toluene ND(2) ND(2) ND(2) 1,000 Ethylbenzene ND(2) ND(2) ND(2) 700 Xylenes ND(2) ND(4) ND(4) 10,000 MtBE ND(2) ND(2) ND(2) 40 1,3,5-TMB ND(2) ND(2) ND(2) 350 1,2,4-TMB ND(2) ND(2) ND(2) Naphthalene 19 ND(5) ND(5) 20

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MONITORING WELL HA-3 Sample Date / 5/28/1999 10/14/1999 2/3/2000 9/6/2000 12/21/2000 7/3/2001 10/4/2001 1/3/2002 Analyte Benzene ND(1) ND(1) ND(1) 1.9 ND(1) Toluene ND(1) ND(1) ND(1) ND(1) ND(1) Not sampled. Ethylbenzene ND(1) ND(1) ND(1) ND(1) ND(1) Xylenes ND(1) ND(1) ND(1) 2 ND(1) MtBE ND(10) ND(10) ND(10) 24.2 14.8 1,3,5-TMB ND(1) ND(1) ND(1) ND(1) ND(1) Monitoring well installed 8/31/2000. 1,2,4-TMB ND(1) ND(1) ND(1) ND(1) ND(1) Naphthalene ND(1) ND(1) ND(1) 1.3 ND(1)

Sample Date / 4/2/2002 7/9/2002 10/8/2002 1/2/2003 4/2/2003 7/2/2003 10/7/2003 1/5/2004 Analyte Benzene ND(1) 23.4 5.9 ND(1) ND(1) ND(1) ND(1) Toluene ND(1) 38.6 29.8 ND(1) ND(1) ND(1) ND(1) Ethylbenzene ND(1) Not ND(1) ND(1) ND(1) ND(1) ND(1) ND(1) Xylenes ND(2) sampled. On 12.3 ND(2) 10.3 ND(2) ND(2) ND(2) MtBE 8.6 semi-annual 32.8 68.7 88.8 11 5.9 2.4 1,3,5-TMB ND(1) schedule. ND(1) ND(1) 2.4 ND(1) ND(1) ND(1) 1,2,4-TMB ND(1) ND(1) ND(1) 10 ND(1) ND(1) ND(1) Naphthalene ND(2) ND(1) ND(1) 1.6 ND(1) ND(1) ND(1)

Sample Date / 4/6/2004 7/7/2004 9/24/2004 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 Analyte Benzene ND(1) ND(1) ND(1) ND(1) Toluene ND(1) ND(1) ND(1) ND(1) Ethylbenzene ND(1) Not ND(1) Not ND(1) Not Not ND(1) Xylenes ND(2) sampled. On ND(2) sampled. On ND(2) sampled. On sampled. On ND(2) MtBE ND(2) semi-annual ND(2) annual ND(2) annual annual ND(2) 1,3,5-TMB ND(1) schedule. ND(1) schedule. ND(1) schedule. schedule. ND(1) 1,2,4-TMB ND(1) ND(1) ND(1) ND(1) Naphthalene ND(2) ND(2) ND(2) ND(2)

Sample Date / 10/20/2006 4/10/2007 10/23/2007 4/8/2008 10/28/2008 4/23/2009 5/4/2010 VPGES Analyte Benzene ND(1) ND(1) ND(2) ND(2) 5 Toluene ND(1) ND(1) ND(2) ND(2) 1,000 Ethylbenzene Not ND(1) Not ND(1) Not ND(2) ND(2) 700 Xylenes sampled. On ND(2) sampled. On ND(2) sampled. On ND(2) ND(2) 10,000 MtBE semi-annual ND(2) annual ND(2) annual ND(2) ND(2) 40 1,3,5-TMB schedule. ND(1) schedule. ND(1) schedule. ND(2) ND(2) 350 1,2,4-TMB ND(1) ND(1) ND(2) ND(2) Naphthalene ND(2) ND(2) ND(5) ND(5) 20

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UPSTREAM SURFACE WATER STATION Sample Date / 10/10/2001 4/2/2002 10/8/2002 4/2/2003 10/7/2003 4/6/2004 7/7/2004 9/24/2004 Analyte Benzene ND(1) ND(1) ND(1) ND(1) ND(1) Toluene ND(1) ND(1) ND(1) ND(1) ND(1) Ethylbenzene ND(1) ND(1) ND(1) Not ND(1) Not Not ND(1) Xylenes ND(1) ND(2) ND(2) sampled. On ND(2) sampled. On sampled. On ND(2) MtBE ND(10) ND(2) ND(2) annual ND(2) annual annual ND(2) 1,3,5-TMB ND(1) ND(1) ND(1) schedule. ND(1) schedule. schedule. ND(1) 1,2,4-TMB ND(1) ND(1) ND(1) ND(1) ND(1) Naphthalene ND(1) ND(2) ND(2) ND(2) ND(2)

Sample Date / 1/12/2005 4/28/2005 7/11/2005 10/5/2005 4/18/2006 4/10/2007 4/8/2008 10/28/2008 Analyte Benzene ND(1) ND(1) ND(1) ND(1) Toluene ND(1) ND(1) ND(1) ND(1) Ethylbenzene Not ND(1) Not Not ND(1) ND(1) ND(1) Not Xylenes sampled. On ND(2) sampled. On sampled. On ND(2) ND(2) ND(2) sampled. On MtBE annual ND(2) annual annual ND(2) ND(2) ND(2) annual 1,3,5-TMB schedule. ND(1) schedule. schedule. ND(1) ND(1) ND(1) schedule. 1,2,4-TMB ND(1) ND(1) ND(1) ND(1) Naphthalene ND(2) ND(2) ND(2) ND(2)

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DOWNSTREAM SURFACE WATER STATION Sample Date / 10/10/2001 4/2/2002 10/8/2002 4/2/2003 10/7/2003 4/6/2004 7/7/2004 9/24/2004 Analyte Benzene 9.3 ND(1) 19.5 ND(1) 2.4 ND(1) ND(1) Toluene 1.4 ND(1) ND(1) ND(1) ND(1) ND(1) ND(1) Ethylbenzene ND(1) ND(1) ND(1) ND(1) ND(1) ND(1) Not ND(1) Xylenes 2.2 ND(2) ND(2) ND(2) ND(2) ND(2) sampled. On ND(2) MtBE 24.4 2.2 51.8 ND(2) 4.4 ND(2) semi-annual ND(2) 1,3,5-TMB ND(1) ND(1) ND(1) ND(1) ND(1) ND(1) schedule. ND(1) 1,2,4-TMB 1.7 ND(1) ND(1) ND(1) ND(1) ND(1) ND(1) Naphthalene ND(1) ND(2) ND(1) ND(2) ND(1) ND(2) ND(2)

Sample Date / 4/23/2009 WQC VPGES Analyte Benzene ND(2) 1.2 5 Toluene ND(2) 6,800 1,000 Ethylbenzene ND(2) 3,100 700 Xylenes ND(2) - 10,000 MtBE ND(2) - 40 1,3,5-TMB ND(2) - 350 1,2,4-TMB ND(2) - Naphthalene ND(5) - 20 NOTES: 1) Data reported in units of micrograms per liter (ug/L). 2) MtBE = methyl tert butyl ether; TMB = trimethylbenzene; ND (x) = analyte not detected above the laboratory practical quantitation limit (PQL) noted in parentheses. --- = Data not reported in historical documents. 3) Data collected prior to October 2008 were obtained from an April 2008 Annual Groundwater Monitoring Report prepared by KAS, Inc. and dated April 29, 2008. 4) VPGESs = Vermont Primary Groundwater Enforcement Standards as presented in Chapter 12, Groundwater Protection Rule and Strategy, adopted February 14, 2005. WQC = Vermont Department of Environmental Protection (VTDEC) Water Quality Criteria, Protection of Human Health, Consumption of Water and Organisms, as presented in the Vermont Water Quality Standards (Vermont Code R.12 004 052), dated January 1, 2008. 5) Results shaded and in bold font indicate constituent concentration was detected above the VPGES or WQC.

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ATTACHMENT A

MAY 2015 ANALYTICAL REPORT

Laboratory Report

124 Heritage Avenue Portsmouth NH 03801 Darrin Santos PO Number: 5650 GeoInsight, Inc. Job ID: 33082 186 Granite Street Date Received: 5/22/15 3rd Floor, Suite A Manchester, NH 03103

Project: Ascutney, VT Irving Former Exit 8 Mobil 5650

Attached please find results for the analysis of the samples received on the date referenced above.

Unless otherwise noted in the attached report, the analyses performed met the requirements of Absolute Resource Associates' Quality Assurance Plan. The Standard Operating Procedures are based upon USEPA SW-846, USEPA Methods for Chemical Analysis of Water and Wastewater, Standard Methods for the Examination of Water and Wastewater and other recognized methodologies. The results contained in this report pertain only to the samples as indicated on the chain of custody.

Absolute Resource Associates maintains certification with the agencies listed below.

We appreciate the opportunity to provide laboratory services. If you have any questions regarding the enclosed report, please contact the laboratory and we will be glad to assist you.

Sincerely, Absolute Resource Associates

Sue Sylvester Date of Approval: 6/5/2015 Principal, General Manager Total number of pages: 5

Absolute Resource Associates Certifications

New Hampshire 1732 Massachusetts M-NH902 Maine NH903

124 Heritage Avenue | Portsmouth, NH 03801 | 603-436-2001 | absoluteresourceassociates.com

1 Project ID: Ascutney, VT Irving Former Exit 8 Mobil 5650 Job ID: 33082 Sample#: 33082-001 Sample ID: HA2 Matrix: Water Sampled: 5/21/15 9:40 Reporting Instr Dil'n Prep Analysis Parameter Result Limit Units Factor Analyst Date Batch Date Time Reference methyl t-butyl ether (MTBE) < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C benzene < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C toluene < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C ethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C m&p-xylenes < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C o-xylene < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C naphthalene < 5 5ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C 1,3,5-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C 1,2,4-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 17:38 SW5030C8260C Surrogate Recovery Limits dibromofluoromethane SUR 104 78-114 %LMM11501219 5/29/15 17:38 SW5030C8260C toluene-D8 SUR 103 88-110 %LMM11501219 5/29/15 17:38 SW5030C8260C 4-bromofluorobenzene SUR 104 86-115 %LMM11501219 5/29/15 17:38 SW5030C8260C

SPACE Sample#: 33082-002 Sample ID: MW 99-2 Matrix: Water Sampled: 5/21/15 10:50 Reporting Instr Dil'n Prep Analysis Parameter Result Limit Units Factor Analyst Date Batch Date Time Reference methyl t-butyl ether (MTBE) < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C benzene < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C toluene < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C ethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C m&p-xylenes < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C o-xylene < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C naphthalene < 5 5ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C 1,3,5-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C 1,2,4-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 15:39 SW5030C8260C Surrogate Recovery Limits dibromofluoromethane SUR 99 78-114 %LMM11501219 5/29/15 15:39 SW5030C8260C toluene-D8 SUR 103 88-110 %LMM11501219 5/29/15 15:39 SW5030C8260C 4-bromofluorobenzene SUR 100 86-115 %LMM11501219 5/29/15 15:39 SW5030C8260C

SPACE

2 Project ID: Ascutney, VT Irving Former Exit 8 Mobil 5650 Job ID: 33082 Sample#: 33082-003 Sample ID: MW 99-3 Matrix: Water Sampled: 5/21/15 11:15 Reporting Instr Dil'n Prep Analysis Parameter Result Limit Units Factor Analyst Date Batch Date Time Reference methyl t-butyl ether (MTBE) < 20 20 ug/L 10 LMM 1501219 5/29/15 21:43 SW5030C8260C benzene 47 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C toluene 15000 E 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C ethylbenzene 1700 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C m&p-xylenes 9000 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C o-xylene 3700 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C naphthalene 390 50ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C 1,3,5-trimethylbenzene 570 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C 1,2,4-trimethylbenzene 2300 20ug/L10 LMM 1501219 5/29/15 21:43 SW5030C8260C Surrogate Recovery Limits dibromofluoromethane SUR 100 78-114 %LMM101501219 5/29/15 21:43 SW5030C8260C toluene-D8 SUR 105 88-110 %LMM101501219 5/29/15 21:43 SW5030C8260C 4-bromofluorobenzene SUR 107 86-115 %LMM101501219 5/29/15 21:43 SW5030C8260C E = The analytical result was above the instrument calibration range. The reported concentration is an estimate. No additional sample remains for reanalysis. SPACE Sample#: 33082-004 Sample ID: MW 99-6 Matrix: Water Sampled: 5/21/15 10:55 Reporting Instr Dil'n Prep Analysis Parameter Result Limit Units Factor Analyst Date Batch Date Time Reference methyl t-butyl ether (MTBE) < 2 2ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C benzene 8 2ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C toluene 110 2ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C ethylbenzene 40 2ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C m&p-xylenes 890 10ug/L53:34 LMM 1501219 6/2/15 SW5030C8260C o-xylene 780 10ug/L53:34 LMM 1501219 6/2/15 SW5030C8260C naphthalene 170 5ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C 1,3,5-trimethylbenzene 83 2ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C 1,2,4-trimethylbenzene 330 2ug/L1 LMM 1501219 5/29/15 16:09 SW5030C8260C Surrogate Recovery Limits dibromofluoromethane SUR 96 78-114 %LMM11501219 5/29/15 16:09 SW5030C8260C toluene-D8 SUR 100 88-110 %LMM11501219 5/29/15 16:09 SW5030C8260C 4-bromofluorobenzene SUR 106 86-115 %LMM11501219 5/29/15 16:09 SW5030C8260C

SPACE

3 Project ID: Ascutney, VT Irving Former Exit 8 Mobil 5650 Job ID: 33082 Sample#: 33082-005 Sample ID: MW 99-7 Matrix: Water Sampled: 5/21/15 11:05 Reporting Instr Dil'n Prep Analysis Parameter Result Limit Units Factor Analyst Date Batch Date Time Reference methyl t-butyl ether (MTBE) < 2 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C benzene < 2 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C toluene 3 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C ethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C m&p-xylenes < 2 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C o-xylene 57 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C naphthalene 14 5ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C 1,3,5-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C 1,2,4-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 16:38 SW5030C8260C Surrogate Recovery Limits dibromofluoromethane SUR 106 78-114 %LMM11501219 5/29/15 16:38 SW5030C8260C toluene-D8 SUR 106 88-110 %LMM11501219 5/29/15 16:38 SW5030C8260C 4-bromofluorobenzene SUR 107 86-115 %LMM11501219 5/29/15 16:38 SW5030C8260C

SPACE Sample#: 33082-006 Sample ID: Trip Blank Matrix: Water Sampled: 5/21/15 0:00 Reporting Instr Dil'n Prep Analysis Parameter Result Limit Units Factor Analyst Date Batch Date Time Reference methyl t-butyl ether (MTBE) < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C benzene < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C toluene < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C ethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C m&p-xylenes < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C o-xylene < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C naphthalene < 5 5ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C 1,3,5-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C 1,2,4-trimethylbenzene < 2 2ug/L1 LMM 1501219 5/29/15 12:12 SW5030C8260C Surrogate Recovery Limits dibromofluoromethane SUR 104 78-114 %LMM11501219 5/29/15 12:12 SW5030C8260C toluene-D8 SUR 105 88-110 %LMM11501219 5/29/15 12:12 SW5030C8260C 4-bromofluorobenzene SUR 102 86-115 %LMM11501219 5/29/15 12:12 SW5030C8260C

SPACE

4 5

ATTACHMENT B

CHARTS

FORMER EXIT 8 MOBIL / IRVING OIL CORP. PROPERTY #72619 ROUTE 131 / I-91 ASCUTNEY, VERMONT SMS #98-2524

Benzene and MTBE at Well MW99-2

100,000 LNAPL

10,000

1,000

100 Concentration (ug/L) 10

Note: Non-detect data were plotted as a value that was Benzene MTBE one-half of the laboratory quantitation limit.

9/2/2015 GeoInsight Project 5650-000: 5650VOCsumm5-15.xlsChrt99-2 Page 1 of 4 FORMER EXIT 8 MOBIL / IRVING OIL CORP. PROPERTY #72619 ROUTE 131 / I-91 ASCUTNEY, VERMONT SMS #98-2524

Benzene and MTBE at Well MW99-3

100,000 LNAPL

10,000

1,000 y = 4E+24e-0.001x R² = 0.6628

100 Concentration (ug/L)

10 y = 3E+30e-0.002x R² = 0.6765 Note: Non-detect data were plotted as a value that was one-half of the laboratory quantitation limit.

Benzene MTBE Expon. (Benzene) Expon. (MTBE)

9/2/2015 GeoInsight Project 5650-000: 5650VOCsumm5-15.xlsChrt99-3 (NoNAPL) Page 2 of 4 FORMER EXIT 8 MOBIL / IRVING OIL CORP. PROPERTY #72619 ROUTE 131 / I-91 ASCUTNEY, VERMONT SMS #98-2524 Benzene and MTBE at Well MW99-6

100,000

10,000

1,000

-0.001x 100 y = 6E+18e R² = 0.2401 Concentration (ug/L) 10

1 y = 3E+26e-0.001x Note: Non-detect data were plotted as a value that was R² = 0.6276 one-half of the laboratory quantitation limit.

Benzene MTBE Expon. (Benzene) Expon. (MTBE)

9/2/2015 GeoInsight Project 5650-000: 5650VOCsumm5-15.xlsChrt99-6 Page 3 of 4 FORMER EXIT 8 MOBIL / IRVING OIL CORP. PROPERTY #72619 ROUTE 131 / I-91 ASCUTNEY, VERMONT SMS #98-2524

Benzene and MTBE at Well HA-2

10,000

1,000

100 y = 2E+20e-0.001x R² = 0.4739 Concentration (ug/L)

Note: Non-detect data were plotted as a value that was one-half of the laboratory quantitation limit. y = 2E+31e-0.002x R² = 0.8057 1

Benzene MTBE Expon. (Benzene) Expon. (MTBE)

9/2/2015 GeoInsight Project 5650-000: 5650VOCsumm5-15.xlsChrtHA-2 Page 4 of 4