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<br /> tDATE December 28 2001
<br /> ' QUARTERLY GROUNDWATER MONITORING REPORT—FOURTH QUARTER 2001
<br /> Facility Former E-Z Serve No 100878 Site Address 1012 West Yosemite Avenue,Manteca,California
<br /> Res onsible Party/Contact Person RPMS-CA/Andrew Long,Project Manager
<br /> Consulting Co /Contact Person ATC Associates Inc /Michael T Davis Project Manager 858 569-0692
<br /> ATC Project No 43 35827 0025
<br /> ' Regulatory Agency/File No County of San Joa uin,Environmental Health Division 1 1452
<br /> WORK PERFORMED THIS QUARTER [October 1,200] —December 31,2001]
<br /> 1 Performed fourth quarter groundwater monitoring and sampling
<br /> 2 Prepared fourth quarter groundwater monitoring report
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<br /> WORK PROPOSED FOR NEXT QUARTER [January 1,2002—March 30,2002]
<br /> ' 1 Perform first quarter groundwater monitoring and sampling
<br /> 2 Submit first carter Eoundwater monitoring report
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
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<br /> Frequency of Sampling Quarterly (Quarterly,etc
<br /> FrequencyFmquency of Monitoring Quarterly 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 None Gallons
<br /> Permits for Dischar a None DPES,POTW,etc
<br /> Current Remediation Techniques None SVES PSH Recove
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<br /> Approximate Depth to Groundwater 15 74 to 16 96 Measured Feet
<br /> Groundwater Gradient 0 001 tuft (Magnitude)
<br /> Groundwater Flow Direction North-northwest Direction
<br /> Discussion On November$, 2001, ATC Associates, Incorporated(ATC)personnel gauged 8 groundwater monitor wells (Figure 1 and
<br /> 2) Depth to groundwater ranged between 15 74(MW-7)to 16 96(MW-1)feet below ground surface(bgs) The direction of groundwater
<br /> flows north-northwest with a calculated hydraulic gradient of approximately 0 001 ft/t3 (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 November 8, 2001, 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 characterized as
<br /> gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylems (BTEX), fuel oxygenates methyl tert-butyl ether (MBE) di-isopropyl
<br /> ether (DIPS), ethyl tert-butyl ether (ETBE), tem-amyl methyl ether (TAME), and tert-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 /> 8015E The highest TPHg, benzene, and MTBE concentrations reported were 4,300, 5 3, and 2'1 'mwrogranms per liter (Ag/L),
<br /> respectively The highest'TPHg concentration was reported in MW-5, the highest benzene concentration was reported in MW-1, and the
<br /> highest MTBE concentration was reported in MW-6 No DIPE, ETBE,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 mointonng event TPHg,
<br /> benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented m'Table 1
<br /> Groundwater analytical results for fuel oxygenate and additives are presented to 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 /> 4th Quarter 2001 Groundwater Report EZ SERVE #100878 ATt'Assouatcs Ing I
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