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' DATE.April 15, 2002
<br /> QUARTERLY GROUNDWATER MONITORING REPORT—FIRST QUARTER 2002
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<br /> Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road Stockton California
<br /> Responsible P /Contact Person RPMS-CA/Andrew Long,Project Manager
<br /> Consultor Co /Contact Person ATC Associates Inc /Michael T Davis Project Manager 858 569-0692
<br /> ATC Project No 43 35827 0026
<br /> Regulatory A enc /CRW CB Case No County of San Joaquin Department of Environmental Health/390499
<br /> WORK PERFORMED THIS QUARTER [January 1,2002—March 31,2002]
<br /> I Performed first quarter groundwater monitoring and sampling
<br /> 2 Prepared first quarter groundwater monitoring report
<br />' WORK PROPOSED FOR NEXT QUARTER [April 1,2002—June 30,20021
<br /> 1 Perform second quarter groundwater monitoring and sampling
<br /> 2 Conduct on-and off-site soil and groundwater assessment
<br />' 3 Submit second quarter groundwater monitoring report
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl (Quarterly,etc
<br />'
<br /> Frequency of Monitoring Quarterly (Monthly,etc
<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 None Gallons
<br /> Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SUES,PSH Recovery)
<br /> Approximate Depth to Groundwater 51 40 to 52 13 (Measured Feet
<br /> Groundwater Gradient 0 002 and 0 015 ft/fl (Magnitude)
<br /> Groundwater Flow Direction Westerly and Easterly (Direction)
<br />' Discussion On January 29, 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 40(MW-6)to 52 13(MW-7)feet below ground surface(bgs)
<br /> The direction of groundwater flow was to the west and east-southeast with a calculated hydraulic gradient of approximately 0 002 and
<br />' 0 015 ft/ft, respectively (Figure 2) No measurable phase-separated hydrocarbons (PSH) were recorded during this monitoring event
<br /> Groundwater elevations and contours are illustrated on Figure 2 and groundwater monitor data is presented in Table 1
<br /> On January 29, 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,MW_
<br /> 6,MW-7,MW-8,MW-9,MW-10,MW-11,MW-I2,VW-I,VW-2,and VW-3 Field logs are also included in Appendix A Groundwater
<br /> samples collected were analyzed for total petroleum hydrocarbons characterized as gasoline(TPHg),benzene, toluene, ethylbenzene, and
<br /> total xylenes(BTEX), fuel oxygenates methyl tert-butyl ether(MTBE),di-isopropyl ether(RIPE),ethyl tert-butyl ether(ETBE),tert-amyl
<br /> methyl ether (TAME), and tert-butyl alcohol (TBA), 1,2-dichlorethane (1,2-DCA), and 1,2-dibromoethane (EDB) by EPA Test Method
<br /> 8260,and methanol and ethanol by EPA Test Method 8015B The highest TPHg,benzene,MTBE,and TBA concentrations reported were
<br /> 19,000, 3,100,350,and 150 micrograms per liter(µg/L),respectively The highest TPHg,benzene,MTBE, and TBA concentrations were
<br /> reported in MW-I2 The highest 1,2-DCA concentration reported was 110 gg/L,in groundwater samples collected from MW-10 and MW-
<br /> 12 DIPE, ETBE,and TAME concentrations were reported below their respective detection limits No methanol or ethanol concentrations
<br /> were reported above the laboratory detection linnts of 100 µg2 in any of the 15 wells TPHg, benzene, and MTBE concentrations are
<br /> illustrated on Figure 2 and historic groundwater analytical results are presented in Tables I and 2 Hydrographs of groundwater elevations
<br /> and analytical data are attached in Appendix B and complete laboratory analytical results and chain-of-custody documentation are attached
<br />' in Appendix C
<br /> I"Quarter 1002 Grarandwarer Reporl(E6 SSR PE #100966 ATC Abso6uales Inc
<br /> IS 11E-Z Serve11009661Reports11EZ966(Q1 2002 GW Rpt)doc ATC Project No 43 25$27 0026
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