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DATE. A nl� 15�2002
<br /> QUARTERLY GROUNDWATER MONITORING REPORT-FIRST QUARTER 2002
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<br /> Facility Former E-Z Serve No 100878 Site Address 1012 West Yosemite Avenue,Manteca,California
<br /> Responsible Part /Contact Person RPMS-CA/Andrew Long,Project Manager
<br /> ' Consultm Co /Contact Person ATC Associates Inc 1 Michael T Davis Project Manager 858 569-0692
<br /> ATC Project No 43 35827 0025
<br /> Regulatory Agency/File No County of San Joaquin,Environmental Health Division/1452
<br /> ' WORK PERFORMED THIS QUARTER [January 1,2002—March 31,2002]
<br /> 1 Performed first quarter groundwater monitoring and sampling
<br /> 2 Prepared first quarter groundwater monitoring report
<br /> ' WORK PROPOSED FOR NEXT QUARTER [Apnl 1,2002—June 30,2002]
<br /> 1 Perform second quarter groundwater monitoring and sampling
<br /> 2 Submit second quarter groundwater momtonng report
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sam lmQuarterly (Quarterly,etc
<br /> Frequency of Monitonng Quarterly _(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 ThisQuarter 166 Gallons
<br /> Permits for Discharge None PES,POTW etc
<br /> Current Remediation Techniques None SVES,PSH Recove
<br /> A roximate Depth to Groundwater 13 25 to 14 72 Measured Feet
<br /> Groundwater Gradient 0 002 ft/ft (Magnitude)
<br /> Groundwater Flow Direction Northwesterly (Direction)
<br /> ' Discussion On January 31,2002,ATC Associates,Incorporated(ATC)personnel gauged 8 groundwater monitor wells(Figure 1 and 2)
<br /> Depth to groundwater ranged between 13 25 (MW-7) to 14 72 (MW-3) feet below ground surface (bgs) The direction of groundwater
<br /> flows northwesterly with a calculated hydraulic gradient of approximately 0 002 ft/ft (Figure 2) No measurable phase-separated
<br /> hydrocarbons (PSH) were recorded during this monitoring event Groundwater elevations and contours are illustrated on Figure 2 and
<br /> ' groundwater monitor data is presented in Table 1
<br /> On January 31, 2002, ATC collected groundwater samples from 8 monitoring wells ATC utilized the attached sampling procedures
<br /> described in Appendix A to collect groundwater samples from MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, and MW-8 Field
<br /> logs are also included in Appendix A Groundwater samples collected were analyzed for total petroleum hydrocarbons charactenzed as
<br /> gasoline(TPHg), benzene, toluene, ethylbenzene, and total xylems(BTEX), fuel oxygenates methyl tert-butyl ether(MTBE) di-isopropyl
<br /> ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and tent-butyl alcohol (TBA), fuel additives 1,2-
<br /> dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) by EPA Test Method 8260, and methanol and ethanol by EPA Test Method
<br /> ' 8015B The highest TPHg, benzene, and MTBE concentrations reported were 5,300, 5 3, and 2 4 micrograms per liter (µglL),
<br /> respectively The highest TPHg concentration was reported in MW-5, the highest benzene concentration was reported in MWA, and the
<br /> highest MTBE concentration was reported in MW-6 No DIPE,ETRE,TAME,TBA, 1,2-DCA,EDB,methanol,or ethanol concentrations
<br /> were reported above their respective laboratory detection limits in any of the 8 wells sampled during this monitoring event TPHg,
<br /> ' benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in Table 1
<br /> Groundwater analytical results for fuel oxygenate and additives are presented in Table 2 Hydrographs of groundwater elevations and
<br /> analytical data are attached in Appendix B and complete laboratory analytical results and chain-of-custody documentation are attached in
<br /> Appendix C
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<br /> f !",Quarter 2002 Groundwater Report EZ SERVE #100878 ATC Asscx ictus Inc'
<br /> ' S11EEz Serve11008781Reports1EZ878(Q1 2002 GW Rpt)doc ATC Project No 43 25827 0025 ,
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