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Well Inspection 249 Oakland Road
Groundwater & Environmental Services, Inc. 425E Hayden Station Road Windsor,CT 06095 Tel(860)688-9023 Fax(860)688-9278 December 31, 2008 Mr.Kevin Neary Connecticut Department of Environmental Protection Bureau of Water Protection and Land Reuse 79 Elm Street Hartford, CT 06106-5127 Re: Potable-Well-Sampling Discontinuation Request Mobil Retail Station#01-QQA 249 Oakland Road South Windsor,CT Dear Mr. Neary: On behalf of ExxonMobil Oil Corporation (EMOC), Groundwater & Environmental Services Inc. (GES) has prepared this document to request approval from the Connecticut Department of Environmental Protection (CTDEP)to discontinue residential potable well sampling associated with the June 2007 gasoline release at the former Mobil retail station located in South Windsor, CT. A brief background and summary of the activities conducted at the site and off-site neighboring properties is provided below to support our conclusion that potable well sampling is no longer necessary. SITE LOCATION AND DESCRIPTION Geographically, the site is located at 41049'19.1" North latitude and 72°32'38.3" West longitude. The site is situated west of the intersection formed by Oakland Road and Felt Road in South Windsor, Connecticut. The site is mostly paved, and onsite features consist of an onsite structure containing a convenience store and four dispenser islands sheltered beneath a canopy. Three gasoline underground storage tanks (USTs) and the associated dispenser pumps and piping were removed from the site in August 2007. The site is in an area that is mixed commercially and residentially zoned. A Site Location Map based on a portion of the U.S. Geologic Survey (USGS) Manchester, Connecticut topographic quadrangle map (USGS, revised 1992) is presented as Figure 1. A Site Map,which depicts pertinent current site features,is included as Figure 2. REGULATORY STATUS As the result of vapors inside the station building and a gasoline sheen on the surface of Farm Brook,the Town of South Windsor Fire Department verbally notified CTDEP;Oil and Chemical Spill Response Division of the release on June 5, 2007 at 23:06 and Case Number 2007-03565 was assigned by the CTDEP, and a CTDEP Emergency Response Coordinator was dispatched to the site. Beginning on June 5,2007 until October 8 2007, when the permanent total phase extraction (TPE) remediation system was activated, ExxonMobil actively removed contaminated soil and impacted groundwater from the site. REMEDIAL RESPONSE ACTIONS Remediation System Following the initial emergency response efforts, a permanent remediation system was installed at the site to address soil and groundwater contamination. The remedial system contains two 20-horse power rotary claw Environmental Solutions and Liability Management r;m_4 a ,®"A Mr. Kevin Neary December 31, 2008 Page 2 of 4 blowers, a low-profile air stripper for primary treatment of recovered liquids, two 500 pound liquid carbon units for secondary water treatment, and external connections for using two 2,000 pound vapor carbon unit for off gas treatment. Ancillary equipment includes an air/liquid separator, oil/ water separator, four bag filters, two transfer pumps, vapor and liquid flow meters, and all interconnecting piping. All the equipment, with the exception of the vapor GACs is contained within a 40 foot long by 8 foot wide steel cargo container. The container is insulated to protect the equipment from the environment. It was also sound proofed to reduce noise associated with the remedial equipment operation to reduce potential nuisance noise to nearby neighbors. A total of 15 recovery/extraction wells (RW-1 though RW-14 and OS-8) were installed in the summer and fall of 2007. The permanent Total Phase Extraction (TPE) system was fully operational in October 2007. In November 2008, three additional recovery wells were installed on adjacent property, 85 Felt Road, to . remediate the off-site groundwater impacts. Currently, the system is operating with nine recovery wells, MW-7,RW-4,RW-6,RW-7,RW-11,RW-12,RW-15,RW-16 and RW-17. Quarterly Groundwater Sampling The on-site and off-site monitoring wells and recovery wells are routinely gauged for depth to water and depth to product. Measurable product has not been present in any monitoring well since August 2007. Beginning in June 2007, available monitoring and recovery wells have been sampled generally on a quarterly basis for groundwater quality to evaluate the effectiveness of the remediation system. Groundwater samples were collected and submitted to Accutest Laboratories of Marlborough, MA for analysis of volatile organic compounds VOCs(including MTBE and ethanol)by Environmental Protection Agency(EPA)Method 8260B and extractable total petroleum hydrocarbons(ETPH)by CTDEP methodology. A summary of groundwater monitoring data are presented in Table 1. Laboratory reports for these sampling events have been submitted to the CTDEP under a separate cover but are available upon request. Sensitive Receptors Survey As part of the remediation response action, a sensitive receptor survey was conducted. A total of twelve potable wells and one irrigation well were located within approximately 300 meters of the site. A list of potable wells is included in Table 2. There is no potable well on-site. There are two potable wells that were identified during the assessment, located at 313 and 319 Oakland Road, that are up-gradient from the site. These wells (at 313 and 319 Oakland Road) have not been part of the potable well sampling program due to their upgradient location, which was agreed upon with the CTDEP. In addition,the three potable wells located at the Wapping Shopping Plaza(291 Oakland Road), which are located between the site and the potable supply wells at 313 and 319 Oakland Road,were sampled and did not identify any constituent concentrations above the minimum laboratory detection limits. A Local Area Map depicting the properties that were sampled is included as Figure 3. The nearest surface water body is Farm Brook, located along the western property boundary(downgradient) of the site. The brook is diverted around the structures at 225 Oakland Road and collects into Petersen Pond located on the 205 Oakland Road property. From the surface of the station property to the surface of Farm Brook, there is approximately a ten to twelve foot change in elevation. According to the Connecticut Water Quality Classification Map for Surface and Ground Waters, Farm Brook is designated as a class SA surface water body. Potable and Irrigation Well Sampling Between June 7, 2007 and November 19, 2008, water samples were collected from 11 nearby potable water wells following verbal approval for access by residents. A water sample was also collected from an irrigation well located at 150 Felt Road. The locations of surrounding properties are shown on Figure 3. The samples were submitted to Accutest for analysis of VOCs plus methyl tert-butyl ether (MTBE) and ethanol by EPA Mr. Kevin Neary December 31, 2008 Page 3 of 4 Method 524.2. Potable well analytical results are summarized in Table 3. Laboratory reports for these sampling events have been submitted to the CTDEP under a separate cover but are also available upon request. Analytical results indicate that gasoline related VOC concentrations have been below laboratory reporting limits in all wells for the past 12 months, except for chloromethane, which was detected in most wells during the August 2008 sampling event. However, chloromethane was not detected in the subsequent sampling event and is not considered a component of gasoline. At 56 Felt Road, trichloroethylene (TCE) has been consistently identified in the potable water sample during each sampling event. The house at 56 Felt Road is located upgradient of the site and maintains lawn mowing equipment at this address. Sampling results were provided to the property owners after each sampling event. PROPOSED SITE ACTION PLAN Based on the lack of gasoline related VOCs in the potable wells over the last year and the significant decrease in the VOC concentrations in groundwater and the remedial system influent groundwater samples, continued potable well sampling is no longer warranted at this site. Specifically, separate phase product has not been detected at the site since August 2007. In fact,the most impacted monitoring well(MW-7),which had product in August 2007, in November 2008 had a benzene concentration of 158 ppb. During the November 2008, all other monitoring wells contained benzene concentrations either below laboratory detection limits or less the 10 ppb. Additionally, the influent groundwater concentrations to the remedial system have been below 10 ppb total BTEX since May 2008. The ultimate goal of the project is to bring this site into regulatory compliance with the Remediation Standard Regulations. To that end, GES will continue to operate the existing total phase extraction (TPE) remediation system, both on-site (249 Oakland Road) and off-site, which was recently expanded to address groundwater impacts at the 85 Felt Road property. As part of the remedial system program, system sampling will continue on a monthly basis and be reported in the Discharge Monitoring Report. GES will also continue sampling surface water in the Farm Brook and groundwater from select on-site and off- site monitoring wells on a quarterly basis to ensure plume capture is maintained and evaluate remedial system effectiveness. Should groundwater concentrations in the off-site monitoring wells increase, ExxonMobil will re-evaluate the need to re-instate the potable well sampling program. We look forward to your quick response as we would like to provide the November analytical results to the residents and at which time we hope to inform them that their assistance in this matter is no longer needed. If you have any questions_ or comments regarding this site, please contact Herb Woike at (800) 220-6119 extensions 3534. Sincerely, GROUNDWATER&ENVIRONMENTAL SERVICES, INC. Matthew Duffy Herbert E.Woike,LEP Staff Environmental Scientist Senior Project Manager Enclosures cc: Mr. Scott Bushroe-ExxonMobil Environmental Services Company Mr. Aaron Green-Connecticut Department of Environmental Protection Vft Mr. Kevin Neary December 31, 2008 Page 4 of 4 Mr. Paul Clark-Connecticut Department of Environmental Protection Mr. Jeffrey Folger-Town of South Windsor Mr. Robert Devito-Town of South Windsor FIGURES Figure I Site Location Map Figure 2 Site Map Figure 3 Local Area Map Figure 4 Surface Water Sample Location Map TABLES Table 1 Groundwater Analytical Data Table 2 . Potable Wells Location Summary Table 3 Potable and Irrigation Well Analytical Data v --I-� � FIGURES ' .�&. •.-�+:� i � 1 R �� 4 It f$ j lji � -� �-. - FouthNIF ZI 1 3 s s 4s{ "Jf ` r' O! ram. ��. ; y y•Y '.i lk lei 11 F �. �.1 "-4-Xbi- t a��• 1 ��� r5� { i I ��� _����� I 14= �t F I � F F� �-' � M1 J f '. -may y ' S �I t 5}�/ F "+ f� -r f F #- SOURCE: USES 7.5 MINUTE SERIES TOPOGRAPHIC QUADRANGLE 1992 MANCHESTER CONNECTICUT CONTOUR INTERVAL — 10' DRAFTED BY: D'U.K. SITE LOCATION YAP ■ (N.J.) CHECKED BY: CONNECTICUT MOBIL SERVICE STATION JOi-QQA 249 OAKLAND ROAD REwewED sr: SOUTH WINDSOR, CONNECTICUT NORTH Groundwater&Exxviroaxn=W Services,hm. 425E HAYDEN STATION ROAD, WINDSOR, CT 06095 SCALE IN FEET DATE FIGURE QUADRMGLE LOCATION 0 2000 6-11-07 1 SOS-4 cecl \ LEGEND a ---GUIDE RAIL OS-3 ` IRF <<<` o +J--, 1 FORMER DISPENSER ISLAND /*SW-6 �,<<fi `� ----- PROPERTY BOUNDARY C IRF IRON ROD FOUND BUILDING /,;✓ DMH� < \ UTILITY MANHOLE « `<�°`< sS` ce ❑ CATCH BASIN CB csci® - CATCH BASIN CURB INLET .(s2-7 /' / ,�ry� ��, ` ``� �� DSH o DRAINAGE MANHOLE �r Q / vacuUM .,°it MW �<� LP,- � \ HYD 4 HYDRANT j OS-2 i` y�``� �``� IRF o IRON ROD FOUND vacuuM r/r E -yam 9T o<< \Ss ° p _1 IPf o IRON PIPE FOUND �; n LP e AREA LIGHT POLE MW-*SB `��<< \\� rse o TRAFFIC: SIGNAL BOX ON H Dp• TV a TRAFFIC SIGNAL POST RW-8 W-5/S&� `N 7 BLACKTOP �� ` \<� UPo Y wv wv C WATER VALVE /el R —4`S —6/!,�° �`y`<\ BUILDING �� \ <<`<o< �� � C.O.p CLEAN-OUT 0 OVERHANG , •� `o<< \o / - P — P -- PRODUCT PIPING LINE SW-2 � /RW-3/SQ-4 J/ ;�` ,��$' \� °.� Ss\ �\ Ss--SS-- UNDERGROUND SANITARY SEWER LINE WV-2 RW-6® , � ��� `� } MW-5/SB- `<�, `�O -uE--UE- — UNDERGROUND ELECTRIC LINE O DRY WEL LP \��< ` �`<``< ��o <<°�A 7 -01I OVERHEAD WIRES RW-7 MW-1 CONC :< ®MW-3 °q `�<� \\ of--OE--OVERHEAD ELECTRIC LINE Rw-11 \ < DISPENS R ' rG�e \` P B �\ / -w w —UNDERGROUND WATER LINE SOS-5 // R 1%SB-1 ,d6 \<c�'L PAD ( `�< -3 `' �RW-10® ��b1 '%` \ <`:� BLACKTOP `�`t�` \ r T —T —UNDERGROUND TELEPHONE LINE /Z-8 ST:�/wV T k�c ` < tiI } < `;,TSB '�"os�( -v —v —VENT LINE IP P. OF RW-12 FORMER \� SANITARY B << \ / GASOLINE 4 \ �/ �`:` CLEAN `�`<. °£`� oe-, W POTABLE WELL USTMW-7\\ ��`Fy '�\ AREA �` RW®`� '' \\OUT <� MONITORING WELL `• � CONCRETE IRF k< RAMP „' cct BEDROCK MONITORING WELL ASPHALT :�° / / / \ L RW-13F» < -CURB / / / \ A ���///���///�� <BUILDING \ !rr 3 �I RECOVERY WELL /CIS- . ��`�tj �-'�' < � SIGN / ur 3 / ?CSW SURFACE WATER SAMPLE + f S�7\�Cy,� RW-2/SB-2 \�� \<e`\\` MOBIL REMOVE M Z RW-14 < \.`\ ,/ / / D RECOVERY WELL �'Y�~ <i ? MW SBA / j Q `'ABANDONED '� CO CRETE j L N frrr os ,� Dls fNSER r <`ASEPTIC F-\ANK N PAR �( `0 ` / Map Notes RGY OS-11 DISSIE ATOR / \c \ iticJ \ � ¢ �F\ �� / n y P' �� n z J `� 1. Information shown hereon was compiled sled f C0 \ 9LACKTOhi '� / p'r / from actual field survey conducted on OSf June 12 :� �\ + x„ �C<(q \* \ / ri J� \ 2007.8, June 15, and December 11, sly kp, `` / North based atonn the dConnactcut States ore d jam PROPOSED \ c y .—WOOD FENCE / /� r /� / Plane Coordinate System, NAD 83 CORs / '��/ / 1`� 9� BUILDING M�)� '`�� T� DU PST9R 3 y Q / 3 y S }. Vertical datum shown hereon is NAVD 88 Nq PROPOSED G ` \c `SSE a LP T� CPAq / a- and was obtained through GPS / BUILDING observations. / xI ` PROPOSED \� c �R� } �ii / DRAFTED BY: / / BUILDING \\ Cy A LP C WELL D.M.K. SITE MAP / ( ) CHECKED BY: MOBIL SERVICE STATION #01-QQA y a `� \ / it = / 249 OAKLAND ROAD PROPOSED \� rr %� / REVIEWED BY SOUTH WINDSOR, CONNECTICUT BUILDING vp / / � �" �c / � / N / NORTH Groundwater&Environmental Services,Inc. C 3 / 425E HAYDEN STATION ROAD, WINDSOR, CT 06095 PROPOSED ss` SCALE IN FEET DATE FIGURE BUILDING �y l a/ y / y � � r / 0 --_. 5-16-08 2 „s 0 LJ LEGEND OAKLAND oAo O Q PROPERTY BOUNDARY (APPROXIMATE}' (, 4113 ® C SAMPLED PROPERTIES /\ 4 I � � OAKLAND RQAD K OA ROAD ROADAD too � o Q 4� 143 / O OAKLAND `VI ROAD Q (SHARED WELL) \ O Q C Q \ 4 VV V OAKLAND ROAD w} - � o 216 O195 \ OAKLAND OAKLAND ROAD V ROAD q NOTES: 249 THE BUSINESSES AT 291 OAKLAND ROAD ARE ;• • OAKLAND SERVICED BY THREE POTABLE WELLS, ALL ROAD 150 CONNECTING TO DIFFERENT BUILDINGS. 225 ROAD O\ / OAKLAND \ C� 130 205 ( ROAD -... �] FELT OAKLAND ROAD ROAD �\ �f Q MAP NOTES 1. INFORMATION SHOWN HEREON WAS COMPILED 2-1 6p 274 • FROM AN ACTUAL FIELD SURVEY CONDUCTED ON \ OAKLAND \\ JUNE 8 & 15, 2007. CAD \ r O 0 2. NORTH ORIENTATION AND BEARINGS ARE GRID 324 NORTH BASED ON THE CONNECTICUT STATE ®ROAD LT � + • OAKLAND PLANE COORDINATE SYSTEM, NAD 83 (CORS). ROAD 3. VERTICAL DATUM SHOWN HEREON IS NAVD 88 A AND WAS OBTAINED THROUGH GPS OBSERVATIONS. 291 OAKLAND� ROAD / O! (SHARED WELL) 40 82 FELT �V ROAD C DRAFTED BY: p -.: D.M.K. LOCAL AREA MAP 74 FELT ROAD CHECKED BY: MOBIL SERVICE STATION •#01-QQA / Q 249 OAKLAND ROAD / REVIEWED BY: SOUTH WINDSOR, CONNECTICUT S6 FELT 66 FELT ROADRoaD NORTH Cowid at=&EnV> Omena Sevices,Inc. 425B HAYDEN STATION ROAD, WINDSOR, CT 06095 a \ ! ! SCALE IN FEET DATE FIGURE ! ! 0 260 6-19-07 3 LEGEND / \ ——— — PROPERTY BOUNDARY (APPROXIMATE) o IRF IRON ROD FOUND / \ ® UTILITY MANHOLE ❑ CATCH BASIN / ceci® CATCH BASIN CURB INLET / DUH 0 DRAINAGE MANHOLE HYD 4 HYDRANT JRF o IRON ROD FOUND IPF o IRON PIPE FOUND / LP e LIGHT POLE TS 0 TRAFFIC SIGNAL BOX TV o TRAFFIC_ SIGNAL POST WV o WATER VALVE / WELLo WELL / \ \ —ss——ss— —UNDERGROUND SANITARY SEWER LINE `5 —uE——uE— —UNDERGROUND ELECTRIC LINE ..,, �.....,.,a IN-7 �. /� \ ` � —OE——of— —OVERHEAD ELECTRIC LINE �•. ,:�`'" °°e.,, \ \ oI+ OVERHEAD WIRES —w —w —UNDERGROUND WATER LINE MONITORING WELL BEDROCK MONITORING WELL RECOVERY WELL \ X SURFACE WATER SAMPLE SOIL BORING 5 ape. SW— Q ! ®` Map Notes \ SW_ 1.Information shown hereon was compiled / a, from an actual field survey conducted on June 8 & 15, 2007. pet ! a.eiros 00� 2. North orientation and bearings are Grid North based on t State Pane Coordinatet System,he NADu83 (COBS). 3. Vertical datum shown hereon is NAVD 88 and was obtained through GPS ,e observations. \ DRAFTED BY: \ D.M.K. SURFACE WATER SAMPLE LOCATION MAP (N.J.) / CHECKED BY: f MOBIL SERVICE STATION #01-QQA 249 OAKLAND ROAD REVIEWED BY: SOUTH WINDSOR, CONNECTICUT / NORTH GmIlmdwater&lEnvimn mental Spaces,]Inc. 425B HAYDEN STATION ROAD, WINDSOR, CT 06095 SCALE IN FEET DATE FIGURE r 6-21-07 4 (Di 0 100 Table 1 SUMMARY OF GROUNDWATER ANALYTICAL RESULTS(VOCS and ETPII) Mobil Service Station M)1-QQA 249 Oakland Road South Windsor,CT c a a d �qq � as �„ ro• ';; � q � w °i � a r_4 y� +'� +� °i *� m H 8 ` B R o a .00 o o w o U Q feet: feet feet-----feet feetA9V L GA Groundwater Protection Criteria 1 1000 700 930 1 70 NE 280 61 61 1 30 30 61 100 350 350 NE - 2.7 NA 100 15 Residential Volatilisation Criteria 130 7100 2,700 8,700 21000 NE NE 1,900 1500 2,800 NE NE 3100 360 280 12,000 390 NA NE NE Surface Water rotection Criteria 710 4 000 000 S80 000 NE NE NE: NE NE NE NE NE NE - NE NE NE NE NE NA 13 :t4W-1 07/06/07 132.45 11.75 11.94 0.19 120.51 7,350 38,700 3.570 13,000 11900 4,940,000 375 <5.0 14.0 206 8.3 <500 101 2,020 915 <2.0 <2.0 BRI 5,660 NS _11w 2 06/08/07 129.14 NM NM NA NA <0.50 <1.0 <1.0 <1.0 <1.0 <200 <5.0 <5.0 15.3 NS <5.0 5.1 NS <5.0 <5.0 NS NS BRL NS NS 06/12/07 129.14 NM NM NA NA <0.50 <7,0 <1,0 1.1 <1.0 200 <5.0 <5.0 12.0 NS <5A <5.0 NS <5.0 <5.0 NS NS BRL NS NS * 07/06/07 129.14 NA 6.77 NA 122.37 118 1,400 190 618 2,6 200 25.1 <5.0 8.3 13.3 <5.0 34.8 <5.0 144 36.9 <2.0- Q.0 BRL 1,090 NS 0$/09l07 129714 NA 050 <I. ,0 ' <1.0 <1.0 <1.0 Q00 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Q.0 <2.0 BRL S7 NS 11/16/07 129.14 NA 7.27 NA 121.87 <0.50 <1,0 <1.0 <1.0 <1.0 <200 <5,0 <5.0 :5.0 �5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Q.0 <2.0 BRL <89 NS 12/10/07 1.29.14 NA 7.23 NA 121.91 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* *NS NS + 02/08/.S 129.14 NA 5.71^ NA 123.43 <0.50 <I.0 <1.0 <1.0 <1.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 Q.0 BRL 110 NS « 05/02/08 129.14 NA 5.98 NA 123.16 <0.50 <I.0 3.9 <1.0 <1.0 Q00 <5.0 <5.0 12.5 12.7 <5.0 16.8 <5.0 <5.0 <5.0 1 <2.0 <2.0 BRL ' 476 NS 07/30/08 1.29,14 NA 6.33 NA 122.81 <0.50 <1,0 <1.0 <1.0 <1,0 <200 <5.0 <5.0 15.3 _NS� <5.0 <5.0 NS <5.0 <5.0 NS NS NS 148 <5.0 08/07/08 129.14 NA 6.51 NA 122.63 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* PIS* NS* NS* NS* NS* NS` NS* * 11/10/08 129.14 NA 6.13 NA 123.01 <0.50 <1.0 <I.0 4:0. <1.0. <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 Q.0 Q.0 BRL 107. NS 14W 3 06/08/07 131.66 NM NM NA NA 2.4 51.3 8.7 31.0 <1.0 <00 <5:0 <5.0 <5.0 NS 75.0 <5.0 NS 7.4 <5.0 NS NS BRL NSF NS 06/12/07 131.66 NM " N[vI NA NA <0.50 2.9 <1.0 5.0 <1.0 Q00 <S.0 <5.0 <5.0 NS <5.0 <5,0 NS <5.0 <5.0 NS N3 BRL NS_ NS + 07/06/07 131.66 NA 8.75 NA 122.89 <0.50 1 <1.0 <1.0 <1,0 I <1.0 - <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 1 <5.0 <5.0 <5.0 <2.0 Q.0 BRL <80 NS + 0008/07 131,66 NA 9.29 NA 122.37 <0,50 6.1 3.1 20.4 <1.0 <200 <5,0 <5.0 <5.0 <5,0 <5.0 <5.0 <5,0 11.4 <5.0 <2.0 Q.0 BRL 85.5 NS 11/16/07 131.62 NA $.64 NA 122.98 <0.50 <1:0 <1.0 <1.0 <1.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 G5.0 <5.0 <2.0 Q.0 BRL <So NS 12/10I07 1.31.62 NA 8.72 NA 122.90 NS NS NS NS 9S NS NS NS NS NS NS NS NS NS NS NS NS NS *NS NS + 02/08/08 131.62 NA 7,31 NA 124.31 <0.50 <1,0 <1.0 <1,0 <1.0 Q00 <5.0 <5.0 <5.0 <5.o <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 Q.0 BRL 192 NS + 05/02/08 1.31.62 NA 7.51 NA 124.11 <0.50 <1.0 <1.0 <1.0 <1.0 <200 <5.0 <5.0 <5.0 7.3 <5.0 11.1 c5,0 6.7 7.3 <2.0 <2.0 BRL 239 NS + 0?(30/08 131.62 NA 8.22 NA 123.40 <0.50 <I.0 <1.0 <1:0 Q:0 <200 <5.0 <5.0 12.2 NS 12.9 19.1 NS 16.6 13.7 NS NS NS 247 <5.0 08/07/08 131,62 NA 8.31 NA 123.31 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* + 11./10/08 131.62 NA 7.98 NA 123.64 <0.50 <1.0 <I.0 _ <1.0 <1.0 <200 <5.0 <5.0 <5.0 <$.0 <5.0 <5.0 <5.0 <5.0 <5.0 NS NS BRL 220 NS 1IW-4 06708/07 1.31.21 NM NM NA NA 0.68 7.6 76.2 112 <1.0 <200 64.1 111 41.5 NS 22.2 303 NS 735 272 NS NS BRL NS NS 06/12/07 131.21 11TM NM NA NA 1,920 27,300 4,950 21,200 129 116,000 740 84.9 24.6 NS 15.1 639 NS 4 80 1,130 NS NS BRL NS NS + 07/06/07 131.21 NA 9.09 NA 122.12 117 4,980 1,580 8,410 <20 <4,000 321 <100 <100 164 <100 382 <100 2,340 694 <40 <40 BRL 6,040 NS + 08/08/0.7 131.21 NA 9.42 NA 121.79 35.2 797 540 3,730 <5.0 <1,000 308 <25 29.8 145 QS 383 <25 2,120 Soo <10 <10 BRL 5,000 NS I f1l6 77 - 131.17 NM NM NM NM NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS If1l0/77 1:31.17 NA 9.42 NA 121.75 NS* NS* NS* NS* NS* NS* NS* NS* NS* _ NS* NS* NS* PIS* NS* NS* NS* NS* NS* *NS NS 02/08/08 131.17 NA 7,89 NA 123.28 NS NS NS NS N$ NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 14W-5 06/08/07 131.62 NM NM NA NA 0.52 4.4 <1.0 2.8 <1.0 <200 <5.0 30.7 16.7 NS 5.5 14.0 NS 32.5 11.9 NS NS BRL NS NS 06/12/07 131.62 NM NM NA NA 0.66 12.6 Q.0 15.6 <1.0 <200 <5.0 17.1 <5.0 NS <5.0 <5.0 PIS 10.2 9.7 NS NS BRL NS NS * 07/06/07 131.62 NA 9.27 NA 123.35 1.0 _ 12.0 <1.0 23.8 <1.0 Q00 <5.0 <5.0 <5.0 <6.0 <5.0 <5,0 <5.0 8.4 <5.0 <2.0 Q.0 BRL 161 NS * 08/09/07 1.31.62 NA - 8.94 NA 122.68 <0.50 v 11,7 4.1 29.3 <1.0 Q00 82 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 17.3 5.5 <2.0 <2.0 BRL 140 NS 11/145/07 131.42 NA 8,91 - NA 122.51 <0.50 <1,0 <1.0 <1;0 <1.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 52.0 <2.0 10.3 NS NS 12/10/07 131.42 NA 8.85 NA 122.57 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NV NS* NS* NS* NS* NS* NS* NS* *NS NS * 02/08/08 131.42 NA 6.82 NA 124.60 <0.50 <1.0 <I.0 <1.0 <1.0 <200 <5,0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 Q.0 BRL <S0 NS * 05/02/08 131.42 NA 6.98 NA 124.44 <0.50 <1.0 <I.0 <1.0 <1.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 C2.0 <2.0 BRL <84 NS * 11/10/08 131.42 NA 7.34 NA 124.08 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* _IM-6 06112/0? 133.35 NM NM NA NA <0.50 <1.0 <L0 - <1:0 <1.0 Q00 <5.0 <5.0 <5.0 NS <5.0 <5.0 N5 <5.0 <5.0 NS NS BRL NS NS + 07/06/07 133.35 NA 9.84 NA 123.51 27.3 539 89.0 316 <1.0 <200 11.5 <5.0 <5.0 6.5 <5A 18.4 <5.0 9L6 24.5 Q.0 Q.0 BRL 510 NS * 08/09/07 133.35 NA 10.37 NA 122.98 20.6 155 10.8 42.9 <1.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 -<5.0 6.1 <5.0 <2.0 <2.0 BRL 131 NS * 11/16/07 133.34 NA `_ 10.54 NA 122.80 <0.50 <1.0 <I.0 <1,0 <1.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 BRL <39 NS 12/10/0? 133.34 NA 10.46 NA 122.88 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* *NS _ NS + 02/08/08 133.34 NA 8.46 NA 124.88 <0.50 <I.0 <1.0 <.0 <1.0 Q00 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Q.0 Q.0 BRL 121 NS * 05/02/08 133.34 NA 8.52 NA 124.82 <0.50 <1.0 <I.0 <1.0 <I.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 Q•0 <2.0 BRL 97 NS + 11./10/08 133.34 NA 9.03 NA 124,31 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* I NS* NS* NS* NS* NS* NS* NS* _M4w 7 07/05/0.7 127.87 7.58 8.21 0.63 119.66 NS NS _ NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 08/08/07 127.87 7.88 8.83 0.95 119.04 NS NS NS NS N$ NS NS NS NS NS NS 14S_ NS NS NS NS NS NS NS NS 11/16/07 127.45 NA 7.61 NA 119.84 2,180 17,300 1,760 7,230 26.5 Q00 297 <5..0 11.3 108 6.2 145 54.2 1,230 360 Q.0 Q.0 _18.1 1,001 NS 12/10/07 127_45 NA 7.79 NA 119.66 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* *NS NS • 02/08/08 12245 NA 6.14 NA 121.31 2,500 22,700 1,320 6,800 118 <20,000 <500 <500 <500 <500 1 <500 <500 <500 1,240 <500 <200 <200 BRL 7,620 NS * 05/02/08 127.45 NA 6.43 NA 121.02 790 2LLg# 6,960 <50 <10,000 <250 <250 <250 <250 <230 <250 <250 W70 376 <100 <100 BRL 6,430 NS 08/16/O8 127.45 NA 7.47 NA 119.98 214 3,450 <10 Q,000 158 <50 <50 NS <50 99.9 NS 630 147 NS NS NS NS NS * 1]./10(0$ 127.45 NA 6.54 NA 120.91 158 5100 1.7 <5.0 174 18.2 6.9 NS <5.0 148 NS 8,57 244 NS NS NS 8940 NS GROUWDWATER&EA"RONME FFAL SERVICES,INC. Mobil SAS#01-QQA,South Windsor,CT Page 1 of 4 Potable Well Sampling Discontinuation Request �® December 2008 Table 1 SUMMARY OF GROUND19VATER ANALYTICAL RESULTS(VOCS and ETPH) Mobil Service Station 001-QQA 249 Oakland Road South Windsor,CT y� q�q L 3 e N9 o y D U I U feet feet feet feet feet /1. 2 GA Groundwater Protection Criteria i 1000 700 530 70 NE 280 61 61 0 30 61 100 350 350 2.7 NA 100 15 Residential olatiliration Criteria 130 7100 2,7 00 8,700 21000 NE NE 1,500 1500 2,800 NE NE 3,100 . 360 280 1 000 390 NA NE NE Surface Water Protection Criteria 710 4.000.000 580.000 NE NE NE NE- NE NE NE NE NE, NE NE NE NE NE NA NE 13 XW-8 08/07/08 133.09 NA 9.55 NA 123.54 <0.50 <1.0 3.1 15.4 <1.0 <200 32.8 11.8 9.0 NO 8.5 ?.1 NS 93.4 6.8 NS NS BRL 755 <5.0 e 11/10/0$ 133.26 NA 9.15 NA - 124.11 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NO NS* NS* NS* NS* 0&1 00/12/07 132.64 1QM NM NA NA <0,50 <1.0 71.0 <1.0 <1.0 <00 GSA <5.0 <5.0 NS_ <5.0 <5.0 NS <5.0 <5.0 NS NO BRL NS NO R 0?105/07 132.64 -- NA 9.53 NA 123.11 <0.50 - <1.0 _<1.0 <1.0- <1.0 <00 <5.0 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 <5.0 <2.0 <.0 BRL <80- NO - e 08/08/07 132.64 NA 10.09 NA 122.55 <0.50 <1.0 <1.0 <.0 <1.0 <00 <5.0 <5.0 <5A <5.0 <5.0 <5.0 G5.5 <5.0 <5.0 <2.0 <2.0 BkL <82 NO R 11/16/07 132.64 - NA - 10.12 NA 122.52 <0.50- <1.0 -_<L0 <1.0 <1.0 <200 <5,0 <5.0 G5.0 <5.6 <5,0 <5.0 <5.0 <5.0 <5.0 <.0 <2.0 13RL <79 NO - - 12/10/07 132.64 NA 10.06 NA 122.58 NS" NS* NS* N$* NS* NS* NS*� NO* NS* NS' NS" NS* NS* NS* N5* NS* NS* NS* Ns* NO R 02108A)8 132.64 - NA . 8.51 NA -124.1:3 <0.50 <1.0 <1.0 <1.4 _ - <1.0 - <00 <5.0 <5.0 <5.0 <510 <5.0 <5.0 <5.0 <5.0 <5.0 <.0 <2.0 BRL <86 NS- 05/02/08 132.64 NA 8,69 NA 123.95 <0.50 <1.0 <1.0 <1.0 <;0 <00 <5.0 <5.0 <5.0 _ <5,0 <5.0 <5.0 <5.0 <5.0 <5.0 <.0 <2.0 BR1, 273 NO 11/10/08 132.64 NA 8.91 NA 123.7:3 NS* NS* NS* NS* NS* NS* NS* NO* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* OS-2 06/12/07 132.46 NM ' NM NA NA <0.50 1.9 <1.0 2.6 <1.0 Q4U G5.0 <S.G <5.0 NS G5.0 <5.0 NS K5.0 <5.0 NO NO BRI NO NO R 0?/06/07 132.46 NA - 8.52 NA -123.94 <0.50 - 4.9 <1.0 6.6 <1.0 <00 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 <5.0 <5.0 - <2.0 <2.0 BRL <89 NO R 08/08/07 132.46 NA 9.07 NA 123.39 <0.50 1.3 2.7 5.4 <1.0 <00 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 13RL NS NS I1/16/07 132.30 NA 9.04 NA 123.26 <0.50 1.9 <1.0 2.6 <1.0 <00 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2A <.0 13RL NO NS 12/10/07 132.30 NA 8.78 NA 123.52 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NO* NS" NS* 6S* NS R 02/08A)8- 132.30 NA 8.59 NA --123.71 - <0.50 <I.0 <.0 <1.0 - <.0 <00 <5.0 <5.G <5.0 <$.0 <5,0 <5.0 <5.0 <.5.0 <5.0 <2.0 - <,0 - BRL <80 NO- - 051OV08 132.30 NA 7.65 NA YU.5 <0,50 <1.0 <1.0 <1.0 <1.0 <o0 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 <5.0 <5.0 Q.0 <,4 BRt 196 NO ° II10/08 132.30 NA 7.67 NA 124.63 NS* NS* NS* NS* NS* NS* NS* NO* NS* NS* NS* NS* NS* NS* NS* NO. NS* NS* NO. NS* 08.3 0611V07 126.06 NM` NM NA NA 19.9 36.4 <1.0 25.3 19.8 <00 <5.0 <5.0 G5.0 NO <5,0 <5.0 NS <5.0 <5.0 NS NO BRL _NS` NS R 07/05/07 126.06 NA 6.58 NA 119.48 0.58 <1.0 <1.0 <1.0 14.9 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <.0 BRL <80 NS R 08/08/07- 126.0E --- NA 6.84 NA 119.22 -<0.50^ <1.0 - <1.0 <1.0 - 10.3 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0� <5,0 _ <5.0 <.0 <2.0 BRL - <83 NO - R 11/16/07 - 126.06 - NA - 6.85 NA 119,21 - <0.50T <1.0 <1.0 - <1.0� - <1.0 <00 <5.0 _<5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 <2.0 BRL <79 NO 12/10/07 126.06 NA 6.89 NA 119.17 NS* NS* NS* NS* NS* NS* NS* NO* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NO R 02/08/08 126.06 NA - 5.40 NA - 120.66 <0.50 <1.0 <I.0 - <1.0 - <1.0 - -<00 G5.0 <5.0 <5.0 <5.0 <5.0 <.5.00 <5.0 <5.0 <5.0 <.0 - <.0 - BRL - 101 NO - R -09/02/08 126.06 - NA - 5.80 NA 120.26 -<0,50 <1.0 ' <1.0 <L0 _ <1.0 <00 <5.0 <5.0 <5.0 <5.0 <5.6 <5.0 <5.0 <5.0 <5.0 <2.0 - <2.0 BRL 161 - NS- - R 11/10/68 - 126.06 NA ' S.93 NA - 120,11. NS* NS* NS* NS* NS* NS* NS* NS*. NS* NS*- NS* NS* NS* NS* NS* NS* 'NS* NS* NS* NS* 0S•4 06/12/07 125.81 IITM NM NA NA - 7050 1.0 <1.0 1.5 <I.0 <00 <5.0 <5.0 <5.0 NO <5.0 75.0 NS <5.0 <5.0 NS NO BRL NO NS` R 0?/05/.)7 - 125.81 - NA 5.54 NA - 120.27 <0.50 7.9 - 1.3 <1.0 <1.0 <00 <5,0 - <5.0 <5.0 - <5.0 <5.0 <5.0 - <5.0 <5.0 - <5.0 <2.0 - -<.0 -- - BRL <80 NS- R 08/08/07 125.81 NA T 5.76 NA 120.05 <0,50 <1.0 <1.0 1.1 <L0 <00 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 <5.0 <5.0 <5.0 <.0 <.4 BRL - <82 NO R 11/16/07 125.8-1 NA 5.69 - NA 120.12 <0.50 - <1.0 <.0 <1.0 <1.0 - <00 <5.0 <5.0 <5.0 <5.0 <5.0 -.5.0 <5.0 <5.0 <510 - <.0 - <2.0 33RL <19 NS 12/10/07 125.81 NA 5.71 NA 120.10 NS* NS* NS* NS* NS* NO. NS* NS* NS* NS* NS* NS* NS* NS* NS* NO NS* NS* NS* NO R 02/08/08 125.81 NA 4.66 NA 121.15 <0.50 <1.0 <1.0 <1.0 <1.0 <200 G5.0 <5.0 <5.0 <5.0 <5A <5.0 <5.0 <.5.0 <5.0 <2.0 <2.0 BRL <80 NS * 05/02/08 125.81 NA 4.88 NA 120.9:3 <0.50 <1.0 <I.0 <1.0 <I.0 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5,0 <5.0 <5.0 <5.0 <2.0 <.0 BRL 134 NO ° 11/10/0$ 125.81 NA 4.98 NA 120,83 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* N5*- NO. NS* NS* NS* NS* NS* NO NS* 03-5 06/12/07 125.97 NM.- NM NA NA 6.2 12.0 <1.0 17.3 68.3 <00 <5.0 <5.0 <5.0 NS <5.0 <.O NS <5.0 <5.0 NS NO BRL NS NO 07/05/07 125.97 NA 6.55 NA 119:42 23.1 11.2 1.0 28.2 42.1 <00 <5.0 <5.0 <5.0 <5.0 <S 0 <5.0 <5.0 <5.0 <5.0 <2.0 <.0 BRL <80 NS -R 08/08/07 125.97 NA - - 6.82 - NA 119.15 -3.1 - <.0 <1.0 <1.0 _ 2.7 - <200 G5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 - <2.0 - <.0 BRL <86 NO R 11/16/07 125.9, - NA _ 6.83 NA 119.14 <0.50 - <.0 <1.0 <L0 <1.0 - <00 <5.0 <5.0 <5.0 <5A - <5A <5.0 <5.0 <5.0 <5.0 <2.0 <.0 - BRL - <84 NO- - 12/10/07 125.97 NA 6.91 NA 119.06 NS* NS* NS* NS* NS* NS* NS* NO* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NO 02/08/08 125.97 NA 5.65 NA 120.32 7.7 7.5 1.1 9.2 4.2 <00 <5.0 <5.4 <5.0 <5.0 <5!) <5.0 <5.0 <5.0 <5.Q <2.0 <2.0 BRL <94 NS R 05/02/08 - 125.97 - NA 6.00 NA -119.97 - 33.0 2.8 <1.0 6.6 2.0 - <200 9.4 <5.0 <5.() - <5.0 <5.0 <5.0 <5.0 <5.0 21.2 - <2.0 12.0 BR1, 165 NS- - OS/19/G8 125.97 NA 6.47 NA 119.50 57.8 3.6 <f.0 7.4 <1.0 <00 58.2 <5.0 <5.0 NS� <5.6 <5.0 NS <5.0 <5.0 NS NS NS 273 NS * 11/14/08 125.97 NA 6.23 NA 119.7.4 2.3 <1.0 <1.0 <1.0 <1.0 <00 <5.0 <5.0 <5.0 NS <5A <5.0 NS <5.0 <5.0 NO NS NO. <90 NS 08.7 R 0?/06/07 127.59 NA 7.91 NA 119.68 51 199 7.4 254 44.6 <00 <5.0 <5.0 <5.0 <5.0 <5.0 <.5.0 <5.0 16.9 59.2 <2.0 <.0 BRL 374 NO * 08/09/07 127.59 NA 8.18 NA 119.41 694 512 231 1,050 51.2 <00 39.9 <5.0 <5.0 9.2 <5.0 18.4 <5.0 138 556 <2.0 <.0 BRL 544 NO R 11/16/07 127.41 -- NA - 8.35 NA 119.0fi 2,850 728 - 252 2,710 111 -<2000 178 <50 <50 60.9 <SO <50 <50 342 115 - <2.0 <:0 BRL 1,020 NS 12/10/07 127.41 NA 8.27 NA 119.14 NS* NS* NS* NS* NS* NS* NS* NO* NS" NS* NS* NS* NS* NS* NS* NO _ NS* NS* NS* NS * 02/08/08 127.41 NA 6.53 NA 120.88 221 93.8 31.6 324 16.5 <00 36.1 <5.0 <5.0 12.4 <5.0 8.0 <5.0 106 36.4 <2.0 <.0 17.0 602 NS R 04/18/09 127.41. NA 7.03 NA 120.38 62.5 <1.0 - <1.0 - 1.9 11.8 <00 -- 10.4 <5.0 <5.0 7.7^ <5,0 <5.0 <5.0 33.6 35.1 <.0 - <2.0 - BRL. 122 NS- 05/02/08 127.41 NA 6.47 NA 120.94 NO NS NO NS NO NO NO NO NS NS ' NS NO NS- NS NS NS NO NS NO NS 08/19/08 127.41 NA 8.84 NA 118.57 80.9 <1.0 4.6 11.0 7.6 <00 41.6 <5.0 <5.0 NS <5;0 <5.0 NO NS NS NS NS NS 159 NS 11/10/(18 127.54 NA 7.16 NA 120.38 17.1 <1.0 <1.0 <1.0 4.4 <200 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 NO NS NS <89 NS OS-8 0?/05/07 127.49 NM NM NA NA NO NO NS _ NS NO NS NS NS NS NS_ NS NS NS NS NS NS NS NS NS NS R 08/09/07 _ 1.27.49 NA 8.38 - NA �119.11 3,080 28,90( - 3,590 14,700 228 667 - 1,140 - <5.0 34.1 324 20.9 663 83.7 3 910 L 1,110 3.3 <.0 BRL NO NS 11/16/07 127.04 1VM NM NM NM NS NS NO NS NS NO NS NS NS NO NS NS NS NS NS NS NS NS NS NS 12/10/07 127.04 NA 7.74 NA 119.30 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS 02/08/08 127.04 NA 7.72 NA 119.32 NS NS NS NS NO NS NO NS NS NS NS NS NS NS NS NS NO NS NS NS R 010 8/08 127.04 NALL6 NA 120.9fi 128 6 1,96011 416 b 2,150 b <10 b <,000 b 78,9 b <50 b <50 b <50 b <50 b 51.3 b <50 b 550 b 159 b <20 b <10 b BRL 1,980 NS 05/02/08 127.04 NA NA NA NS NS NS NS NO NO NS NO _ NS NS NS NS NS NS_ NS NS NS NS N3 NS 0?/30/08 . 127.04 NA NA 120.57 ill 642 390 1,500 <10 <2000 69.1 <50 420 NO <50 <50 NS 523 242 NS NS NS 5,050 <5.0 08/07/08 127.04 NA NA 120.57 NS* NS* NS* NS* NS* NS* NS* NS* NS"' NS* NS* NS* NS* NS* NS* NS* NS' NS* NS* NS*R 11/10/08 -124.93 NA NA 122.01 NS* NS* - NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* - GROUADWAYER&ENVIRONMENTAL SERVICES,INC. Page 2 of 4 i= Mobil S/S#101•QQ&South Windsor,CT Potable Well Sampling Discontinuation Request December 2008 ��� Table 1 SUAVV ARY OF GROUNDWATER ANALYTICAL RESULTS(VOCS and E'IPH) Mobil Service Station 001-QQA 249 Oakland Road South Windsor,t � u feet feet feet feet feetfL 100 15 GA Groundwater Protection Criterin' 1 1060 700 530 70 NE 280 61 61 30 30 61 100 350 350 NE 39 NA NE NE Residential Volatilization Criteria 130 7100 2 700 8 700 21000 NE NE 1,500 1500 2 800 NE NE 3 100 360 280 12 0 3N9Ed NA NE 13 Surface Water Protection Criteria 710 4,000,000 .580 000 NE NE . NE NE NE NE NE NE NE NF � <1.0 BRL 52S NS 0$-9 * O N18/08 130.95 NA 10.06 NA 120.89 1.8 112 29.7 561 <1.0 <200 17.2 <5.0 <5.0 <5.0 5:0 S.b 5.0 225 60.4 <2.0NS NS O5/02/08 130.95 NA 9.97 NA 12�:98 NS NS NS NS NS NS NS 5 0 S 0 NS <5.0 5 0 N NS NS NS NS NS NS NS NS 435 NS < 08/19/08 130.95 NA 6.31 NA 124:64 6.3 +<1.0 <1.0 107 <1.0 <200 2C 9 <5.0 <5.0 NS N3 NS 202 NS * 11/10/08 125.12 NA 4.I2 NA 121.00 s 1.4 d.0 <I:0 29.9 Q.0 <20U 13.6 <5.0 <5.0. NS 5.0 72.0 5. <1 0 g 591 NS OS.14 R 04/18/08 131.15 NA 9.92 NA 121.23 13,4 308 232 802 <1.0 <200 47.7 17.0 5.7 29.8 5.0 72.0 5.0 331 157 <2:0 05/02/08 131.15 NA 9.66 NA 121,49 NS 36 NS NS NS NS NS NS NS NS NS NS NS N5 5. NS NS NS NS NS 08l14/OS 131.15 NA 8.06 NA 123.09 _:0.50 <l.0 <1.0 <1.0 Zo QOo 5.0 5.0 5.0 NS 5.0 <5.0 NS 5.0 <5.0 NS NS R NS S * I1/10/08 127.01 NA 5.65 NA 121.36 <0.50 <1.0 <1:0 Q:0 <1.0 <ZOU 5.0 5.0 5.0 NS 5.0 5.0 NS <5.05.0 NS N4 8900 NS OS.11 ° 0,1/18/08 130.92 NA 10.44 NA 120.48 137 _ 4,530 1,130 4,860 <1.0 Q00 230 40.4 13.1 <5.0 8.3 300 14.1 1,110 306 GL.O OS/02/08 130.92 NA 10.29 NA 120.63 ` NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS N3 _ NSF NS NS 08/19/08 130.92 NA 7.55 NA 123.37 9.5 33.4 59:2 303 <1.0 <200 44.9 <5.0 <S.0 NS 5.0 29.3 N3 103 49.6 NS NS ITS NN NS NS NS NS # 11/10/08 127.95 NA 7.31 NA 120.6A 2.8 12.8 23.4 98.4 <1.0 <29U 13.0 5.0 5.0- NS 5.0 _ 20.5 NS 103 31.3 NS N O 2 3 74 NS OS-12 R 04/18/UR 129.95 NA 12.10 NA 117.8'5 19.4 12 2.9 19 1,5 <200 5.0 <5.0 5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <2.0 O5/02/OR 129.95 NA 9.$4 NA 120.11 NS NS NS NS N$ NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 05/02108 129.95 NA 8.21 NA 12199 16.1 5.2 <1.0 6,0 <L0 <200 5.0 5.0 <5.0 <5.0 SA 5.0 NS 5.0 <5.0 NS NS NS 188 NS e 11/10/08 128.08 NA 7,91 NA 120:17 1.4 <L0 <1.0 2.5 <1.0 <20G 5.0 <5 <5.0 <5.0 5,0 <5.0 NS 1 0 5.0 NS NS NS <90 NS OS-13 08/19l0$ 128.08 - NA - 10.33 NA 117.08 NS NS NS NS NS NS NS NS NS NS - NS NS NS NS NS NS NS NS NS ITS 10/09J08 127.41 NA 10.09 NA 117.32 <0,50 <L0 <1.0 <1.0 <1.0 <200 5:0 S.0 <5.0 NS 5.0 <5.0 NS 5.0 <5.0 NS NS NS NS NS 11/10/08 131.22 NA 10.13 NA 121.09 <0.50 <1.0 <t:0 <l:U <1.0 QOU <S,0 <50 _ 5,0 NS 5.0 5.0 NS 5.0 <5.0 NS NS NS NS NS F14 08/19l08127.4E NA 10.31 NA 117.17 NS NS NS NS N NS N3 NS NS NS NS NS NS NS 5 NS NS NS N 1 NS 10/09/08 127.48 NA 10.04 NA 117,44 <0.50 <1.0 <1:0 Q:0 <1,0 <20U <5.0 <SA <5.0 NS 5.0 5'0 NS 50 5.0 NS NS NS <8911/10/08 131.05 NA 10.11 NA 120,94 _ <0.50 <I.0 <1:0 <10 <10 Q00 5.0 5.0 <5.0 NS 50 <5.0 NS NS 11/10/08 128.05 NA $.57 NA 119>8i <0.50 <1.0 <1.0. <1:0 GL0 CL00 <5.0 <S.0 5.0 NS S.0 <5.0 NS 5.0 5.0 NS NS NS NS.11/10l08 12R.61 NA $.29 NA 120.32 <0.50 <I,0 <lA <1.0 <1.0 QOG <5.0 5.0 5.0 NS 5.0 <5.0 NS - 5.0 <5.0 NS NS NS E10.0 NS 08/19/08 128.56 NA 8.71 NA 119:SS <0.50 Q,0 <Lp <1.0 <1.0 QOU <5.0 <S.0 5.0 NS 5.0 <5.0 NS 50 5.0 NS NS NS 4?4 NS x 11/10/OR 128.74 NA 8.58 NA 120:16 <0:50 <I.0 <1,0 <1.0 <1.0 QOG 5.0 S.0 5.0 NS 5.0 5.0 NS <5.0 5,0 N5 NS NS <94 ITS OS.17 08/19/08 132.50 NA DRY NA NA NS NS NS NS N$ NS NS NS` NS NS NS NS NS N5 NS NS NS NS NS NS 11/10/UR 131.67 NA DRY NA NA N$ NS NS NS N5 NS NS NS NS NS NS NS NS NS NS NS N3 NS NS NS RW-1 06/12/07 131.80 NM NM NA _ NA 14,900 93,600 12,206 37,500 2 310 GL,000 712 <50 <50 NS <SO 529 NS 2,6DU 684 NS NS BItL N5 NS a 06/12/07 131.80 NA 11.48 NA 120:32 7,060 44300 3,060 8,400 1286 344,000 <1,000 <I,D00 <I;D00 <1,000 <Z,DDD <I,D00 <1,090 1,010 <1,000 <400 <900 BRL 3,370,000 N3 RN_2 06/12/07 32.22 NM NM NA"NA"3 33,90U 842 4, 57,970 114 <50 50 NS <5D 85.0 NS 736 194 NS NS07(05/07 132.22 NA 10.8 NA NS NS NS NS NS NS NS NS NS NS NS NS NS N3 NS NS NS NS NS RW� 0?/05/07 132.09 NA 11.63 NA 120.46 NS NS NS9AMIRMpi NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS N3 NS RW-4 06/12(07 132.19 NM NM NA NA 11,200 75,600 8,740 33,900 720 1,000,000 487 <50 50 NS <SD 4.68 NS 2,540 681 NS NS BRL NS NS 0?/OS/U7 132.19 NA 11.75 NA 120.44 N$ NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS 08109l07 132.I9 NA 11.80 NA 120.39 NS NS NS NS N,S NS NS NS NS NS NS NS NS ITS NS NS NS _ NS N3 NS 11/16A77 131.81 NM NM Nb1 NM NS NS _ NS ITS NS NS NS NS NS NS NS NS NS NS- NS NS NS 'NS NS NS 12/10/07 13L81 NA 13.81 NA 11R.00 NS* NS* _NS* NS* NS* NS' NS* NS* NS* NS" NS* NS* NS* NS* NSF NS" NS" NS NS* NS 02/08/08 131.81 NA 10.11 NA u 121,70 NS ITS NS NS N NS NS NS NS NS NS NS NS 17 7,N. NS NS NS NS NS RW-5 06/08/07 132.12 NM NM NA NA 363 2 210 159 492 3,7 1,916 23.5 20.5 8.4 NS 5.0 42.8 NS 173 47.8 NS ITS BFtI NS NS 06/12/07 32.12 NM NM NA NA 291 2,720 563 2,210 13.5 7,360 153 50 <50 NS <50 158 NS 873 256 NS_ NS BRL NS NS 08/09/07 132.12 NA 11.45 NA 120:67 NS N3 _ ITS _ NS N$ NS NS NS NS NS NS NS NS NS NS NS NS NS NS. NS I1/16/U7 131.64 NIv1 NM Ntvf NM NS NS NS NS N$ r NS NS NS NS NS NS NS NS NS NO NS ITS NS NS NS 12/10/07 131.6A NA 11.03 NA 120:61 - NS* NS* NS* NS* NS* NS* NS* NS* NS* NS" NS* NS* NS* NS* NS* NS* NS*= NS* NS* NS 02/08/08 131.64 NA 9.97 NA 121.67 NS NS NS NS N$ NS NS NS NS NS NS N5 NS NS_ NS NS NS NS NS_ 5- * 0?/30/08 131.fi4 NA 10.57 NA 121.07 <0.50 <L0 <1.0 <1.0 <1.0 <20U <5.0 5.0 :5.0 NS <5 0 <5.0 NS 5.0 <5.0 NS NS NS 208 5.0 0$/07/UR 131.b4 NA 10.42 NA 121.22 NS* NS* NS* NS* NS* NS*_ NS* NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* RW-6 0?/OS/07 128.17 NA 7.$6 NA 120.31 NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS_ NS NS NS NS 08/09/07 128.17 8.16 8.18 0.02 119:99 NS NS NS NS NS NS NS 5 0 3 F 98 0.5 178 24 99 1,910 553 Q 0 Q 0 39 0 1 190 NS * 11/16/07 127.97 NA 7.56 NA 120:41 279 4,980 _1,210 6,620 2,6 Q00 284 12/10/tl7 127.97 NA $.91 NA 119,06 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS" NS* NS* NS* NS* NS* N10 N10 BRL 2,970 NS a 02/08/08 127.97 NA 6.66 NA 121.31 32.3 215 - 726 2,220 <5.0 <1000 279 41.9 <25 749 <25 174 <25 14 2 15743T <10 <10 BRL 2,670 ITS s 05/02/OR 127.97 NA 8.93 NA 119.04 22.8 48,8 183 249 5.0 <1000 75:4 25.4 <LS 34.9 QS 25.1 <25 86. 157 11/10/08 127.97 NA 6.77 NA 121.20 0.86 3.9 14:9 18.3 <1.0 <200 208 7.2 <5.0 NS 5.0 253 NS 86.9 21.1 NS NS NS NS ITS RW_7 11/10/07 128.38 NA 7.78 NA 120.60 NS NS NS NS N$ NS NS NS NS NS NS NS N5 NS NS NS NS NS NS ITS * 08/09(t)7 128.3$ NA 8.79 NA 119.59 483 3,430 359 1,400 161 110,000 388 5.0 5.0 26.G 5.0 74.3 10.9 457 124 <2.0 19.5 BRI. NS NS ]1/16/D7 127.86 NM NM Nlof NM NS NS NS NS NS NS NS NS yNS NS NS NS NS NS NS NS NS NS NS NS 12/10/07 127.86 NA 8.61 NA 119.25 NS* NS* NS* NS* NS* NS* NS* N5* NS* NS" NS* NS* NS* NS NS NS_ NS NS N3 NS 02/08/�8 127.86 NA S.S9 NA 119,27 NS NS NS NS NS NS NS NS NS NS NS_ NS NS_ _ 11/08/08 127.86 NA 6.93 NA 120.93 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* Page 3 of 4 GROUAZ?WATER&ENVIRONMENTAL SERVICES,INC. Mobil S!S#01-QQA,South Windsor,CT � ® Potable Well Sampling Discontinuation Request December 2008 Table 1 SUMMARY OF GROUNU'YVATER ANALYTICAL RESULTS(VOCS and ETPII) Mobil Service Station 901-QQA 249 Oakland Road South Windsor,CT n e� a W yy 7 a a F F+ a u feet feet - -feat. feet - - Peetaff - uff/L - - t _pJL4 P350 GA Groundwater Proteption Criteria 1 1 000 700 530 70 NE 280. 61 61 i 30 30 61 astf.100 350 2.7 NA 100 15 Residential Volatilization Criteria 130 7100 2 700 8 700 1000 NE NE 1$Q0 1500 ! 2 800 NE NE 3100 36012 000 390 NA NE NE urface Water Pro#action Criteria 710 4 000 000 580 000 NE NE NE. NE NE NE. NE NE NE NE NE NE NE NA NE 13 RW-8 0?!06/07 128.76 NA $.16 NA 120.60 11,300 58,600 2,750 9,250 2,060 11,600 273 <5,0 9.1 I 136 3.3 324 103 1,270 <2.0 e2.0 BRL 8,680 NS 08/09/07 128.76 NA $.31 NA 120,45 7,97045,700 2,470 9,200 1,430 <4Q000 <Z,00 <1000 <1,D00 j <I,DDO <1,000 - <1ODD <1,000 1380 s400 <400 BRL 6,p70 NS 11/16/07 12853 NM NM NM NM N$ NS NS NS NS NS NS NS NS i NS~ NS NS NS NS NS NS NS NS �NS NS 12/10/07 128.53 NA DRY NA NA NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* _ NS* �NS* �NS* NS" NS* N3 02/08/08 128.53 NA DRY NA NA NS NS NS NS NS NS NS NS NS 1 NS� NS NS NS ITS NS-1-NS NS NS N$ NS RW-9 12/08/08 132.64 NA pRY NA NA NS* NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS 02/OS/OR 132.64 NA 10.g8 NA 122.16 NS NS NS NS NS NS NS NS NS ; NS NS NS NS NS NS NS NS NS NS NS RW-10 12/10/07 132.69 NA I .22 NA 119.47 NS* NS* NS* NS* NS* N$* NS* _ NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS 02/08/08 132.69 NA 10.96 NA 121:73 NS NS NS NS NS _ NS NS NS NS NS NS.NS NS NS NS NS NS NS NS NS NS RW41 12/10/07 132.13 NA 11.74 NA 120.39 NSA' NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS 02lOS/0$ 132.13 NA 11.61 NA 12052 NS NS NS NS NS NS NS NS NS I NS NS NS NS NS NS NS NS NS NS NS " 0?/30/08 132.13 NA 11.27 NA 120,86 3.7 <1.0 3.4 <1,0 <1.0 QO0 <5.0 <5.0 <5.0 o- NS- <5.0 <5.0 NS <5.0 <5.0 NS NS NS 447 <5.0 08/07/OR 132:13 NA 11.71 NA 12Q 42 NS" NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* I NS* NS* NS* NS* NS* NS" NS* NS* RW-12 11./16/07 131.42 :[QA 11.09 NA 12Q84 220 1260 217 1,570 12.1 <00 104 G5.0 <5.6 149 <5.0 26.6 <5.0 4.59 122 <2.0 <2.0 BRL NS NS 12/10/07 131.42 - NA - 69 -NA �129.85 NS* NS* NS* NS" NS* NS* NS* NS* NS" NS* NS* NS* NS* NS* NSA NS* NS* N5* NS* NS " 02/08/88 - 131.42 NA 9.69 NA 121.73 24.2 3:7 222 248 I5.0 QOG 50.4 ]3.3 �5.0 20,8 <5,0 53.2 <5.0 278 85.9 �2.0_ <.O BRL 1370 NS 08/19/08 131.42 NA 11.83 1VA 119.59 NS NS NS N$ NS NS NS NS NS NS _ NS NS _ NS NS NS NS NS NS NS NS " 11/10/08 131.42 NA 9.9$ NA 12L,44 0.72 <1.0 8.1 4.0 <I:0 QOU <5.0 <5.0 _ ND NS <5,0 6.4 NS 15.1. <5.0 NS N8 NS 141 NS RW-13 11/16/07 - 131.95 NA 11,43 NA 121.08 469 5,220 708 4,100 20.5 <200 164 <5.0 <5.0 46.9 <5.0 90.7 5.5 727 22S <2S NS NS 61 10 NS 12/10l07 131.95 NA 12.34 NA 120.17 s N5" NS* NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS 02/N/U8 131.95 NA 9.99 NA 121. 22?.7 215 245 906 <5.0 <I000 76.2 <25 <25 c25 <25 <25 <25 3S0 107 <10 <10 131 1,780 NS " OSl02/OS 131 95 RNA 10,23 NA 121.TL <0.50 8.4 5.3 19,7 <I.0 Q00 <5,0 c5.0 G5.0 <3.0 G5.5 <5.0 <5.0 9,2 <S.0 <2.0 <2,0 BRL 122 NS " 08/19/08 131.95 ` 10.48 NA 120 97 <0.50 8.1 11.9 33;8 <1.0 <200 <5.0 <5A <5.0 NS <5.0 <5.0 NS 28.4 8.2 NS NS NS 108 NS " 12/10/OR 131.95 10.31 NA 121.64 <0.50 Q:0 <1.0 1.1 Q.0 Q00 <5.0 <5.0 <5.0 NS <5;0 <5.0 NS <5.0 <5.0 NS NS NS <$9 <5.0 RW14 12/10/07 132.26 10.65 NA 121,61 NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* N5* NS 02l08/08 132.26 9.65 NA 122,61 N8 NS NS NS. NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS NS " 07/30/0$ 132.26 9.57 NA 12269 <0.50 14.8 4.1 40.6 <1.0 .200 <5.0 <5.0 <3.0 NS <5.0 <5.0 NS 13.3 E5.0 NS N8 NS <100 <5.0 08/19/OR 119.97 NA 10.65 NA 121:fi:1 NS* NS* NS* NS" NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* NS* RW15 " 08/19/OR 126.97 NA 6.51 NA 120 46 _ 6�$ _<1:O <1:0 <1:0 <1.0 <200 <5.0 <5.0 <5.0 NS <5.0 <5.0 NS <5.0 G5.0 NS NS NS 102 NS " 01/19/08 127.30 NA 6.34 NA 1209fi 33.2 6.9 1.7 271 L2 «00 <5,0 <6:0 <5,0 NS� <5.0 <5.0 NS <5.0 <5.0 NS NS NS 91.4 NS RW-16 + 08/19/08 127.04 NA 6.21 NA 120;83 4.8 619 573 4,710 <1.0 Q00 210 <5.0 6:5 NS <5.0 145 NS 1,520 283 NS NS NS 6,630 NS " 11/10/08 1L7.47 NA 6.78 NA 120;69 0.63 7.8 80.5 519 - <1.0 <200 49.2 14.1 6.2 NS <5.0 99,6 NS 378 141 NS NS NS 146D NS 08/19/0R. 127.14 NA 7.03 NA 12R11 3.5 <1.0 1.2 36.7 <1.0 Q00 24.9 <5.0 <5.0 NS <5.0 <5.0 NS 7.8 <5:0 NS NS NS 375 NS " I1/101 127.g5 NA 6.92 NA 12053 <0.5U <1.0 <1.0 2.1 <1.0 <200 <5.0 <5.0 <5.0 NS <5.0 <5.0 NS <5.0 <5.0 NS NS NS <89 NS otes: "<'=less than laboratory reporting]unit VOCs'=volatile organic compounds NS=not sampled for analyte BTP11=extractable total petroleum hydrocarbons µg/L=micrograms per Liter NE=no established standard BRL below reporting limits *=sample collected via low-flow methodologies MTBE=methyl tart-butyl ether NA=not applicable NM=not measured NS*=not a regularly scheduled sampling event Bolded values represent concentrations that are above applicable groundwater standards b=analyte found in associated method blank Italicized values represent laboratory reporting limits that are above applicable groundwater standards On July 30,2008 RW-5 and RW-11 were gauged later in the day. ORO UATD4Y.4fTER&ENriRONMENT 4L SERVICES,INC. Mobil SIS#01-QQA South Windsor,CT Page 4 of q Potable Well Sampling Discontinuation Request December 2008 Table 2 POTABLE WELL LOCATION SUMMARY Mobil Service Station#01-QQA 249 Oakland Road South Windsor,CT Status Distance ft' Access A Bement 56 Felt Road Up-gradient 630 y 74/82 Felt Road Up-gradient 430 y 130 Felt Road Up-gradient 330 y 150 Felt Road* Up-gradient 600 y 118 Oakland Road Down-gradient 1,660 y 134 Oakland Road Down-gradient 1,530 y 143/151 Oakland Road Down-gradient 1,300 y 146 Oakland-Road Down-gradient 1,360 y 195 Oakland Road Down-gradient 660 y 274 Oakland Road Up-gradient 300 N 291A Oakland Road Up-gradient 160 y 291C Oakland Road Up-gradient 500 y 291D Oakland Road Up-gradient 660 y 313 Oakland Road Up-gradient 760 NA j9 Oakland Road Up-gradient. 930 NA Notes: *=irrigation well ft=feet NA=access not attempted due to upgradient status GROUNDWATER&ENVIRONMENTAL SERVICES, INC. Page 1 of 1 Mobil S/S#01-QQA,South Windsor,CT Potable Well Sampling Discontinuation Request Derember 2008 a-� Table 3 SUMMARY OF POTABLE AND IRRIGATION WELL ANALYTICAL RESULTS Mobil Service Station#01-QQA 249 Oakland Road South Windsor,CT VOCs were analyzed by EPA Method 524..2, ETPH was a alvzed by CTDEP Methodolo ies. PC a119 a. v y w W c oo W N C W fbg. fbg I ag/l, L l L L L L L L m L CTD.P Action Levels for Private Wells 1 - 1,000 NE NE 7i) NE **2.7 **5 Ag/NE NA NE EP. aximum Contaminant Level 5 1,000 700 10,000 NE NE NE NE 5 NA NE 118 Oakland Road 06/07/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <5p <50 <0.50 BRL NS 07/09/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <50 <50 <0,50 BRL NS 08/06/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0,50 1 BRL <0.080 11/16/07 <0,50 <0.50 <0.50 <0.50 <0.50 NS - <0.50 <0.50 <0,50 BRL NS 02/08/08 <0,50 <0,50 <0,50 <0.50 <0.50 NS <O.SO <0.50 <0,50�T BRL NS 05/23/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0,50 B12.L NS 08/11/08 <0.50 <0.50 <0.50 <0.50 <M0 NS <0.50 <0.50 <0,50 BRL NS 11/19/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <p,50 <0.50 <0,50 BRL NS 134 Oakland Road 150 38 06/a 1/07 <0.50 <0.54 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0,50 BRL NS 07/09/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0,50 <0,50 BRL NS _ 08/06/07 <0,50 <0.50 <0.50 <0.50 --<0.50 <50 <0,50 <0,50 <0,50 BRL <0.086 03/26/08 <0.50 <0.50 <0,50 <0.50 <0.50 NS <p,50 <0,50 <0,50 BRL NS 05/23✓O8 <0.50 <0.50_ <0,50 <0.50 <0.50 NS <0.50 <0.50 <0,50 BRL NS 08/11/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0,50 <0.50 BRL NS 11/19/08 <0.50 -<O.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 146 Oakland Road 06111/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0,50 <0.50 <0.50 BRL NS 07/09/07 <C.SO <0.50 <0.50 <0.50 <0,50 <SO <0.50 <0.50 <0.50 BRL NS 08/06/07 <0.50 _ <0.50 <0.50 <0.50 0.50 <50 <0.50 <0.50 <0,50 BRL <0.080 08/28/07 <0,50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0.50 BRL NS 12/13/07 <0,50 <0,50 <0.50 <0.50 <0.50 NS <0,50 <0.50 <0.50 BRL NS 02/08/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0,50 <0,50 BRL NS 05/23/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0,50 BRL NS 08/11/08 1 <0,50 -<0.50 <0.56 <0,50 <0,50 NS 884 <0,56 <0,50 BRL NS 151/143 Oakland Road 200 31 06/07/07 <0.50 <0.50 <0.56 <0.50 <0.50 <50 <0.50 <0.50 <0,50 BRL NS 07/09/0.7 <6.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0,50 <0,50 BRL NS 08/06/07 <0,50 <0.50 <0.50 <0.50 <0. 00 <.50 <0.50 <0:50 <0,50 BRL <0,080 11/16/07 <0.50 <0.50 <0,50 <0.50 <0.50 NS <0,50 <0,50 <0.50 B12L NS 02/08/08 <0,50 <0.50 <0.50 <0.50 <0.50 NS <00 <0.50 <0,50 BRL NS 05/23/08.8 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0,50 <0.50 BRL NS < ,50 050 NS08/11/0 , . . R 11/19/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0,50 I BRL NS 195 Oakland Road 06/11/07 <0,50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0.50 BRL NS 08/06/07 NS NS NS NS NS NS ' NS NS NS _ NS <0.80 09/04/07 <0.50 <0.50 <0,50 <0.50 2.1 <50 <0.50 <0.50 <0.50_ BRL NS 09/07/07 <0.50 <0.50 <0.50 <0.50 1.7^ <50 <0.50 <0.50 <0.50 BRL NS 02/08/0.8 <0.50 <0.50 <O.SO <0.50 <0.50 NS <0.50 <0.50 <0,50 BRL NS _ 05/23/08 <0.50 1 <0.50 <0.50 <0.50 <0.50 NS _ <0.50 <0.50_ <0.50 BRL NS 08/1.1/08 <0.50 <0,50 <0.50 <0.50 <0.50 _NS <0.50 <0,50 <0.50 B12L NS 11/19/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 1 <0.50 1 <0.50 BRL NS GROUNDWATER&EArHROM ENTAL SERVICES,INC. Mobil S/S 901-QQA,South Windsor,CT e i of 3 Potable Well Sampling Discontinuation Request Pagel December 2008 ��,® Table 3 SUMMARY OF POTABLE AND IRRIGATION WELL ANALYTICAL RESULTS Mobil Service Station#01-QQA 249 Oakland Road South Windsor,CT VOCs Were analyzed by EPA Method 524.2. ETPH was anal ,ed b CTDEP Methodolo ies. v b 46 fbg ib L L L: L L L L L L L m L CTDPH Action Levels for Private Wells' 1 1,000 NE NE- 70 NE **2.7 **5 NE NA NE EPA Maximum Contaminant Level 5 1,000 700 10,000 NE NE NE NE 5 Nits NE 274 Oakland Road 06/07/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0,50 <0.50 <0.50 BRL NS 291A Oakland Road 112 22 06/07/07 <0.50 <0.50 <0,50 <0.50 <0.50 <50 <0.50 <0.$0 <0.50 BRL NS 07/09/07 <0.50 <0,50 <0,50 <0.50 <0.50 <50 <0.50 <0,50 <0.50 BRL NS T 08/06/07 <0.50 <0,50 <0.50 1 <0.50 <0.50 <50 <0.50 <0.50 <0.50 BRL <0.080 11/16/07 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 02/08/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0,50 " <0,50 - <0.50 BRL NS 05/23/08 <0.50 <0.50 <0,50 <0.50 <0.50 NS <0.50 <0.50 <0.56 BRL NS 08/11/08 <0,50 <0,50 <0.50 <0.50 <0.50 NS 0.97 <0.50 <0.50 BRL NS - 11/19/08 <0.50 <0,50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 291C Oakland Road 06/13/07 <0.50 <0,50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0.50 BRL NS 07/09/07 <0:,50 _ <0,50 <0,50 <0.50 <0.50 <50 <0,50 <050 <0.50 BRL NS 08/06/07 <0..50 <0.50 <0.50 <0.50 <0.50 <.50 <0.50 <0,50 <0.50 BRL <0.080 11/16/0.7 <0.50 <0,50 <0,50 <0.50 <0.50 NS <0,50 <0,50 <0.50 BRL NS 02/08/08 <0.50 <0.50 <0,50 <0.50 <0.50 NS <0,50 <0.50 <0.50 BRL NS 05/23/0.8 <0.50 <0.50 <0,50 <0.50 <0.50 NS <0.50 <0,50 <0.50 BRL NS 08/11/08 <0.50_ <0.50 <0.50 <0.50 <0.50 NS 0.90 <0.50 <0.50 BRL NS 11/19/08 <0.,50 <0.50 <0,50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 291D Oakland Road 06/13/07 <0.50 <0,50 <0,50 <0,50 <0.50 <50 <0.50 <0.50 <0.50 BRL NS 07/09/07 <0..50 <0,50 <0,50 <0.50 <0.50 <50 <0,50 <0.50 <0.50 BRL NS 11/16/07 <0,50 <0:50 <0,50. <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 02/08/08 <6.50 <0,50 <0,50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 05/23/08 <0.50 <0.50 <0,50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 08/19/08 <0.50 <0,50 <0.50 <0.50 <0.50 _NS 0,79 3.7 <0.50 BRL NS 11/19/08 <0.50 <0.50 <0,50 <0.50 <0.50 NS <0,50 <0.50 <0.50 BRL NS 56 Felt Road 06/11/07 <0..50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0,50 1.4 BRL NS 07/09/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0,50 <0,50 1.1 BRL NS 08/06/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0,50 1.3 BRL <0.080 11/16/07 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0,50 <0.50 1.3 BRL NS 02/08/O8 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0,50 1.2 BRL NS 05/23/08 <.50 <0.50 <0.50. <0.50 <0.50 NS <0,50 _<0,50 1..3 BRL NS 08/11/08 <U0 <0.50 <0.50 <0.50 <0.50 NS 0.83 <0,50 1.4 BRL NS 11/19/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 1.3 BRL NS 82/74 Felt Road 300. 9 06/07/07 <0.50 <0.50 <0,50 <0.50 <0.50 <50 <0..50 <0,50 <0.50 BRL NS 07/09/07 <0.50 <0.50 <0,50 <0.50 <0.50 <.50 <0,50 <0.50 <0,50 BRL NS _ 08/06/07 <0..50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50_ <0.50 BRL <0.080 11/16/07 <0.50 0.76 <0.50 <0.50 0.55 NS <0.50 <0.50 <0.50 BRL NS 02/08/08 <0.50 <0.50 <0.50 <0.50 <0.50_ NS 1 <0.50 <0.50_ <0.50 BRL _NS 05/23/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 08/11/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS 0.66 <0.50 <0.50 BRL NS 11/19/08 <0,50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0,50 1 <0.50 BRL NS C GROUNDW4TER&EWIRONAZENTt4L SERVICES,INC. Mobil S/S#01-QQA,South Windsor,CT Page 2 of 3 Potable Well Sampling Discontinuation Request December 2008 t Table 3 SUMMARY OF POTABLE AND IRRIGATION WELL ANALYTICAL RESULTS Mobil Service Station#01-QQA 249 Oakland Road South Windsor,CT VOCs were analyzed by EPA Method 524.2. ETPH was a alyzed by CTDEP Methodologies. V d o ^orX lug a, fb ., fb L L /L L MIL L L L p. WL L m L CTDPH Action Levels for 1frivate Wells 1 1,000 NE NE 70 NE **2.7. **5 NE 1\A, NE EPA Maximum Contaminant Level .8 1,000 700 10 000 NE NE NE NE 5 NA NE 130 Felt Road 06/07/07 <0.50 <0,50 <0,50 <0.50 <0.50 <50 <50 <50 <0.50 BRL NS 07/11/07 <0,50 <0.50 <0.50 <0.50 <0.50 <50 <.50 <50^ <0.50 BRL NS 08/06/07 <0.50 <0,50 <0,50 <0.50 <0.50 <50 <50 <50 <0.50 BRL <0.080 03/26/018 <0.50 <0,50 <0,50 _ <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 05/23/0.8 <0.50 <0.50 <0.50 _ <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS T 08/11/0.8 <0,50 <0.50 <o.50 <0.50 <0.50 NS 0.75 <0.50 <0,50 BRL NS 11/19/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <0.50 <0.50 <0.50 BRL NS 150 Felt Road* 06/11/0.7 <0.50 <0.50 <0,50 <0.50 <0.50 <50 <0.50 <0.50 <0.50 BRL NS 07/11/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0,50 <0.50 <0.50 BRL NS 08/06/07 <0.50 <0.50 <0.50 <0.50 <0.50 <50 <0.50 <0.50 <0.50 BRL <0.080 11/16/07 <0.50 <0,50 <0.50 <0.50 <0.50 NS <0150 <0.50 <0.50 BRL NS 02/08/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS <050 <0.50 0.64 BRL NS 05/23/08 <0.50 <0,50 <0,50 <0.50 <0.50 NS <0.50 <0.50 0.64 BRL NS 08/11/08 <0.50 <0.50 <0.50 <0.50 <0.50 NS 1.0 <0.50 <0.50 BRL NS 11/19/08 <0.50 <0.50 <0,50 <M0 <0,50 NS <0.10 <0.50 <0.50 BRL NS Notes: "<"=less than laboratory reporting limit NE=no established standard µg/L=micrograms per liter NA=not applicable MTBE=methyl tort-butyl ether BRL=below laboratory reporting limit VOCs=volatile organic compounds *=irrigation well CTDPH=Connecticut Department of Public Health **=based on Connecticut Remediation Standard Regulation(Groundwater Protection Criteria) EPA=United States Environmental Protection Agency GROUNDWATER&ENVIROMAYENTAL SERVICES,INC, Mobil S/S#01-QQA,South Windsor,CT Page 3 of 3 Potable Well Sampling Discontinuation Request * December 2008 "rj`VA