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<br />' DATE July 8,2003
<br /> QUARTERLY GROUNDWATER MONITORING REPORT-SECOND QUARTER 2003
<br />' Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road,Stockton,California
<br /> Res onsible P /Contact Person RPMS-CA/Jeff Burke
<br />' Cansultin Co /Contact Person ATC Associates Inc /Jeanne Homsey,Senior Project Manager 209 579-2221
<br /> ATC Pro ect No 54 25827 2611
<br /> Regulatory A enc /CRW CB Case No County of San Joa um Department of Environmental Health/390499
<br /> WORK PERFORMED THIS QUARTER [April 1,2003-June 30,2003]
<br /> 1 Performed second quarter groundwater monitoring and sampling
<br /> 2 Prepared second quarter groundwater monitoring report
<br /> WORK PROPOSED FOR NEXT QUARTER [July 1,2003-September 30,2003]
<br /> 1 Conduct on-and off-site soil and groundwater assessment and remediation well installation
<br />' 2 Perform third quarter groundwater monitoring and sampling
<br /> 3 Submit third quarter groundwater monitoring report
<br /> 4 Evaluate the need for additional assessment
<br /> 5 Obtain CAP approval from SJCEHD
<br />' Current Phase of Project Assessment Assessment,Remediation, etc
<br /> Frequency of Sampling Quarterly (Quarterly,etc
<br /> Frequency of Monitoring _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 Quarter None Gallons
<br /> Pure Water Removed This Quarter 275 Gallons
<br /> Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recovery)
<br /> ATproximate Depth to Groundwater 52 69 to 53 56 Measured Feet
<br />' Groundwater Gradient 0 0003 ft/ft _(Magnitude)-
<br /> Groundwater
<br /> Ma itude
<br /> Groundwater Flow Direction Varies (Direction)
<br /> L Discussion On April 16,2003,ATC Associates Inc (ATC)personnel gauged purged and sampled 18 groundwater monitor wells and 3
<br /> vapor extraction wells(VW-1,VW-2,and VW-3)at the site(Figures 1 and 2) Depth to groundwater ranged between 52 69(MW-13)to
<br /> 53 56 (MW-14) feet below ground surface (bgs) The direction of groundwater flow was generally northeasterly with a calculated
<br /> hydraulic gradient of approximately 0 0003 ft/ft, respectively (Figure 3) No measurable phase-separated hydrocarbons (PSH) were
<br />' recorded during this monitonng event Groundwater elevations and contours are illustrated on Figure 3 and groundwater-monitoring data
<br /> is presented in Table 1
<br /> On April 16, 2003, ATC collected groundwater samples from 18 monitor and 3 vapor extraction wells ATC utilized the attached
<br />' sampling procedures described in Appendix A to collect groundwater samples from MW-1,MW-2,MW-3,MW-4,MW-5,MW-6,MW-
<br /> 7, MW-8, MW-9, MW-]0,MW-11, MW-12, MW-13, MW-14,MW-15,MW-16, MW-17, EX-1, VW-1,VW-2, and VW-3 Field logs
<br /> are also included in Appendix A Groundwater samples collected were analyzed for total petroleum hydrocarbons characterized as
<br /> gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tert-butyl ether (MTBE), di-
<br /> isopropyl ether (DIPE), ethyl ter -butyl ether(ETBE), tert-amyl methyl ether(TAME), and tert-butyl alcohol (TBA), 1,2-dichlorethane
<br /> (1,2-DCA), and 1,2-dibromoethane(EDB)by EPA Test Method 8260 TPHg concentrations were reported above the laboratory method
<br /> Reporting Limit(RL)of 50 micrograms per liter(gg/L) in groundwater samples collected from 9 of the twenty-one(21)wells sampled
<br /> this quarter The highest TPHg, benzene, and MTBE concentrations reported were 16,000, 3,400, and 290 gg/L, respectively, in the
<br />' groundwater samples collected from EX-1 TBA was detected above the laboratory RL ranging from 20 to 200 pg/L in 4 wells sampled,
<br /> the highest concentration reported was 120 gg/L in groundwater samples collected from VW-3 1,2-DCA concentrations were reported
<br /> above the laboratory RL ranging from 2 0 to 20 gg/L in 5 wells,the highest 1,2-DCA concentration reported was 39µg/L in groundwater
<br /> samples collected from MW-7 EDB,TAME,and DIPE concentrations were reported below their laboratory RL ranging from 2 0 to 20
<br />' lig/L in the 21 wells sampled TPHg,benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical
<br /> results are presented in Tables I and 2 Hydrographs of groundwater elevations and analytical data are attached in Appendix B and
<br /> complete laboratory analytical results and chain-of-custody documentation are attached in Appendix C
<br /> 4'6 Quarter 2002 Groundwater Report E-Z SER VE #100966 ATC Associates Inc
<br />' S 11E-Z Servell009661Reporis11EZ966GWR001 doc ATC Project No 43 25827 0026
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