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DATE December 28 2001
<br />' QUARTERLY GROUNDWATER MONITORING REPORT--FOURTH QUARTER 2001
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<br /> Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road,Stockton,California
<br /> Responsible P /Contact Person RPM$-CA/Andrew Long,Pro ect 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 [October 1,2001 —December 31,2001]
<br />' 1 Performed fourth quarter groundwater monitonng and sampling
<br /> 2 Submit work plan for on-and off-site soil and groundwater assessment
<br /> 3 Prepared fourth quarter groundwater monitoring report
<br />' WORK PROPOSED FOR NEXT QUARTER [January 1,2002--March 30,20021
<br /> 1 Perform first quarter groundwater monitoring and sampling
<br /> 2 Conduct on-and off-site soil and groundwater assessment
<br /> 3 Submit first quarter groundwater monitoring report
<br />' Current Phase of Project Assessment Assessment,Remediation, etc
<br /> Frequency of Sampling Quart erl uarterl etc
<br />'
<br /> Frequency of Monitoring Quarterly (Monthly,etc
<br /> Li uid 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 None Gallons
<br /> Permits for Discharge None DPES,POTW,etc
<br /> Current Remediation Techniques None (S ES,PSH Recovery)
<br /> Approximate Depth to Groundwater 55 01 to 55 80 Measured Feet
<br /> Groundwater Gradient 0 007 ft/ft (Magnitudel
<br /> Groundwater Flow Direction North and Southerl Direction
<br />' Discussion On November 6 2001, ATC Associates, Incorporated(ATC)personnel gauged 15 groundwater monitor wells (Figure 1 and
<br /> 2) Depth to groundwater ranged between 55 01 (MW-6)to 55 80(MW-7)feet below ground surface(bgs) The direction of groundwater
<br /> flaw was to the north-northeast and southerly with a calculated hydraulic gradient of approximately 0 007 ft/ft(Figure 2) No measurable
<br /> phase-separated hydrocarbons(PSH)were recorded during this monitoring event Groundwater elevations and contours are illustrated on
<br />' Figure 2 and groundwater monitor data is presented in Table
<br /> On November 6, 2001, ATC collected groundwater samples from IS 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,MW-8,MW-9,MW-
<br /> 10, MW-11, MW-12, VW-1, VW-2, and VW-3 Field logs are also included in Appendix A Groundwater samples collected were
<br /> analyzed for total petroleum hydrocarbons as gasoline(TPHg), benzene,toluene, ethylbenzene, and total xylems(BTEX),fuel oxygenates
<br /> methyl tert-butyl ether(MTBE), di-isopropyl ether(DIPS), ethyl tert-butyl ether(ETBE), tert-amyl methyl ether(TAME), and tert-butyl
<br /> alcohol (TBA) by EPA Test Method 8260, and methanol and ethanol by EPA Test Method 8015B The highest TPHg, benzene, and
<br /> MTBE concentrations reported were 15,000, 4,100, and 340 micrograms per liter(µg/L), respectively The highest TPHg, benzene, and
<br /> MTBE concentrations were reported in MW-12 No methanol or ethanol concentrations were reported above the laboratory detection
<br /> limits of 1,000 pg/L in any of the 15 monitor wells TPHg, benzene, and MTBE concentrations are illustrated on Figure 2 and historic
<br /> groundwater analytical results are presented in Table 1 Analytical concentrations for fuel oxygenates and additives for this monitonng
<br /> event are presented in Table 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 /> I41h Quarter 1001 Groundwater Report EZ SERVE #100966 ATC A,Ssouates Inc.
<br /> S 1Documents1EZ966(Q4 2001 GW Rpt)doe ATC Project No 43 25827 0026
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