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DATE September 26,2003
<br />! QUARTERLY GROUNDWATER MONITORING REPORT-THIRD QUARTER 2003
<br /> Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road, Stockton,California
<br /> Responsible Party/Contact Person RPMS-CA/Jeff Burke
<br /> Consulting Co /Contact Person ATC Associates Inc 1 Jeanne Homse ,Senior Project Manager 209 579-2221
<br />' ATC Project No 54 25827 2612
<br /> Regulatory A enc /CRWQCB Case No County of San Joa um Department of Environmental Health/390499
<br /> WORK PERFORMED THIS QUARTER [July 1,2003-September 30, 2003]
<br /> 1 Performed third quarter groundwater monitoring and sampling
<br /> 2 Prepared third quarter groundwater monitoring report
<br /> WORK PROPOSED FOR NEXT QUARTER [October 1,2003- December 31,20031
<br /> 1 Perform fourth quarter groundwater monitoring and sampling
<br /> 2 Submit fourth quarter groundwater monitoring report
<br /> 3 Evaluate the need for additional assessment
<br /> 4 Obtain CAP approval from SJCEHD
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br />'
<br /> Frequency of Sampling uarterl uarterl , etc
<br /> Frequency of Morntonng Quarterly (Monthly, etc
<br /> Liquid Phase Hydrocarbons Present On Site No Yes/No
<br /> Cumulative PSH Recovered to Date Unknown Gallons
<br /> PSH Recovered This uarter None Gallons
<br /> Pure Water Removed This Quarter None Gallons
<br /> Permits for Discharge None (NDPES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recovery)
<br /> Approximate Depth to Groundwater 56 58 to 57 63 Measured Feet
<br /> Groundwater Gradient 0 001 ft/ft Ma itude
<br /> Groundwater Flow Direction Variable Direction
<br /> Discussion On July 16,2003,ATC Associates Inc (ATC) personnel gauged and sampled 17 groundwater monitoring wells at the site
<br /> (Figures 1 and 2) Depth to groundwater ranged from 56 58 (MW-13)to 57 63 (MW-7)feet below ground surface(bgs) The direction
<br /> of groundwater flow was generally northerly(Figure 3)with a calculated hydraulic gradient of approximately 0 001 ft/ft No measurable
<br /> phase-separated hydrocarbons(PSH)were recorded during this monitoring event Groundwater elevations and contours are illustrated on
<br /> Figure 3 and groundwater-monitoring data are presented in Table 1
<br />' On July 16, 2003, ATC collected groundwater samples from 17 monitoring wells Monitoring wells MW-1 through MW-8 were not
<br /> purged prior to sample collection Monitoring wells MW-9 through MW-17 were purged prior to sample collection 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-11, MW-12,MW-13,MW-14,MW-15,MW-16,and MW-17 Field logs are also included
<br /> in Appendix A The groundwater samples were analyzed for total petroleum hydrocarbons characterized as gasoline (TPHg) by EPA
<br /> Method 8015B, benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 802113, fuel oxygenates methyl tent-butyl
<br /> ether (MTBE), di-isopropyl ether(DIPE), ethyl tert-butyl ether(ETBE), tert-amyl methyl ether (TAME), and tert-butyl alcohol (TBA),
<br /> 1,2-dichlorethane (1,2-DCA), and 1,2-dibromoethane (EDB) by EPA Method 8260B TPHg concentrations were reported above the
<br /> laboratory method Reporting Limit (RL) of 50 micrograms per liter (µg/L) in groundwater samples collected from 5 of the 17 wells
<br /> sampled this quarter The highest TPHg, benzene, and MTBE concentrations reported were 3,200, 110, and 180 gg/L, respectively, in
<br /> the groundwater sample collected from MW-12 TBA was detected above the laboratory RL of 20 pg/L in groundwater samples
<br /> collected from 5 of the 17 wells sampled,the highest concentration reported was 240µg/L in groundwater sample collected from MW-9
<br /> 1,2-DCA concentrations were reported above the laboratory RL ranging of 2 0 µg/L in groundwater samples collected from 10 of the 17
<br /> wells, the highest 1,2-DCA concentration reported was 180 µg/L in the groundwater sample collected from MW-I4 ED13, TAME,
<br /> DIPE, and ETBE concentrations were reported below the laboratory RL of 2 0 µg/L in the groundwater samples collected from all 17
<br />' wells sampled TPHg, benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are
<br /> presented in Tables I and 2 Hydrographs of groundwater elevations and analytical data are attached in Appendix B and complete
<br /> laboratory analytical results and chain-of-custody documentation are attached in Appendix C
<br /> 3'j Quarter 2003 Groundwater Report E-Z SERVE 9100966 ATC AmoLiates Inc.
<br /> S 1Environmenta1125827126 StocktonlReports1EZ966(2003 Q3 GW RPT)doe
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