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DATE July 15, 2002
<br /> lie
<br /> QUARTERLY GROUNDWATER MONITORING REPORT-SECOND QUARTER 2002
<br /> FaciIi Former E-Z Serve No 100966 1 Site Address 2537 Waterloo Road,Stockton,California
<br /> Responsible P /Contact Person RPMS-CA/Felix Ohu,Project Manager
<br /> Consultor Co /Contact Person ATC Associates Inc /Michael T Davis Project Mana er858 569-0692
<br /> ATC Project No 43 35827 0026
<br /> Regulatory A enc /CRW CB Case No Coun of San Joaquin Department of Environmental Health/390499
<br /> WORK PERFORMED THIS QUARTER [April 1,2002—June 30,2002]
<br /> 1 Performed second quarter groundwater monitoring and sampling
<br /> 2 Prepared second quarter groundwater monitoring report
<br /> WORK PROPOSED FOR NEXT QUARTER [July 1,2002—September 30,2002]
<br /> I Perform third quarter groundwater monitoring and sampling
<br /> 2 Conduct on-and off-site soil and groundwater assessment
<br /> 3 Submit third quarter groundwater monitoring report
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl uarterl ,etc
<br /> Frequency of Monitoring uarterl Monthly,etc
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<br /> Liquid Phase Hydrocarbons Present On Site No es/No
<br /> Cumulative PSH Recovered to Date Unknown Gallons
<br />' PSH Recovered This Quarter None Gallons
<br /> Pure Water Removed This Quarter 457 Gallons
<br /> Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recove
<br /> Ile Approximate Depth to Groundwater 51 55 to 52 35 Measured Feer
<br /> Groundwater Gradient 0 001 ft/ft (Magnitude)
<br /> Groundwater Flow Direction Northerly Direction
<br />' Discussion On May 31, 2002, ATC Associates, Incorporated (ATC) personnel gauged 12 groundwater monitor wells and 3 vapor
<br /> extraction wells (Figure 1 and 2) Depth to groundwater ranged between 51 55 (MW-6) to 52 35 (MW-7) feet below ground surface
<br /> (bgs) The direction of groundwater flow was northerly with a calculated hydraulic gradient of approximately 0 001 ftJft, respectively
<br /> (Figure 2) No measurable phase-separated hydrocarbons (PSH) were recorded during this monitoring event Groundwater elevations
<br /> and contours are illustrated on Figure 2 and groundwater monitor data is presented in Table 1
<br /> On May 31, 2002, ATC collected groundwater samples from 12 monitoring wells and 3 vapor extraction wells ATC utilized the
<br /> attached sampling procedures described in Appendix A to collect groundwater samples from MW-1, MW-2, MW-3, MW-4, MW-5,
<br /> MW-6, MW-7, MW-8, MW-9, MW-10, MW-I1, MW-12, VW-1, VW-2, and VW-3 Field logs are also included in Appendix A
<br /> Groundwater samples collected were analyzed for total petroleum hydrocarbons characterized as gasoline (TPHg), benzene, toluene,
<br /> ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tert-butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tert-butyl
<br />' ether (ETBE), tert-amyl methyl ether (TAME), and tert-butyl alcohol (TBA), 1,2-dichlorethane (1,2-DCA), and 1,2-dibromoethane
<br /> (EDB),and methanol and ethanol by EPA Test Method 8260 TPHg concentrations were reported above the laboratory detection limit of
<br /> 500 nucrograms per liter(pg/L)in 5 of the fifteen wells sampled The highest TPHg,benzene,and MTBE concentrations reported were
<br />' 16,000,6,800,and 330 p g/L,respectively The highest TPHg concentrations were reported in samples collected from MW-10 and MW-
<br /> 12, the highest benzene concentration was reported in VW-1, and the highest MTBE concentration was reported in MW-12 TBA was
<br /> detected above the laboratory detection limit of 5 0 gg/L in 6 wells sampled,the highest concentration reported was 230 pg/L in samples
<br /> collected from MW-12 1,2-DCA concentrations were reported in 14 wells,the highest 1,2-DCA concentration reported was 370µg/L in
<br /> groundwater samples collected from MW-10 DIPS, ETBE, and TAME concentrations were reported below their respective detection
<br /> hmits No methanol or ethanol concentrations were reported above the laboratory detection limits of 250 gg/L in any of the 15 wells
<br /> TPHg,benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in Tables
<br /> I and 2 Hydrographs of groundwater elevations and analytical data are attached in Appendix B and complete laboratory analytical
<br />! results and chain-of-custody documentation are attached in Appendix C
<br /> aRecommendations Conduct on-and off-site assessment to complete lateral delineation of MTBE impact groundwater
<br /> 2"d Quarter 2002 Groundwater Report E-Z SERVE #100966 ATC Assowatf-s Inc
<br /> S 11E-Z Serve11009661Reports11EZ966(2002 Q2 GW Rpt)doe ATC Project No 43 25827 0026
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