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<br /> ' DATE JulJul 15 2002
<br /> QUARTERLY GROUNDWATER MONITORING REPORT—SECOND QUARTER 2002
<br /> Facility Former E-Z Serve No 100878 Site Address 1012 West Yosemite Avenue,Manteca,California
<br /> Responsible P /Contact Person RPMS-CA/Felix Ohu,Project Manager
<br /> Consulting Co 1 Contact Person ATC Associates Inc 1 Michael T Davis Project Manager 858 569-0692
<br /> ATC Pro ect No 43 35827 0025
<br /> Regulatory Agency/file No County of San Joaquin,Environmental Health Division/ 1452
<br /> WORK PERFORMED THIS QUARTER [April 1,2002—June 30,2002]
<br /> 1 Performed second quarter groundwater monitoring and sampling
<br /> ' 2 Prepared second quarter groundwater monitoring report
<br /> WORK PROPOSED FOR NEXT QUARTER [July 1,2002—September 30,2002]
<br /> 1 Perform third quarter groundwater monitoring and sampling
<br /> 2 Submit third quarter groundwater monitoring re ort
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl (Quarterly,etc
<br /> '
<br /> Frequency of Monitoring Quarterly Month] 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 165 Gallons
<br /> Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES PSH Recovery)
<br /> Approximate Depth to Groundwater 13 60 to 15 00 (Measured Feet
<br /> '. I Groundwater Gradient 0 004 fUft (Magnitude)
<br /> Groundwater Flow Direction - Northwester] Direction
<br /> ' Discussion On May 2, 2002, ATC Associates, Incorporated (ATC) personnel gauged 8 groundwater monitor wells (Figure 1 and 2)
<br /> Depth to groundwater ranged between 13 60 (MW 7)to 15 00 (MW-3) feet below ground surface(bgs) The direction of groundwater
<br /> flows northwesterly with a calculated hydraulic gradient of approximately 0 004 fl/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 May 2,2002,ATC collected groundwater samples from 8 monitoring wells ATC utilized the attached sampling procedures desenbed
<br /> ' 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 logs are also
<br /> included in Appendix A Groundwater samples collected were analyzed for total petroleum hydrocarbons characterized as gasoline
<br /> (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), fuel oxygenates methyl tert-butyl ether(MTBE), di-isopropyl ether
<br /> (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and tert-butyl alcohol (TBA), fuel additives 1,2-dichloroethane
<br /> ' (1,2-DCA)and 1,2-dibromoethane(EDB)by EPA Test Method 8260,and methanol and ethanol by EPA Test Method 8015E The highest
<br /> TPHg, benzene, and MT13E concentrations reported were 12,000, 6 4, and 14 micrograms per liter (µg/l,), respectively The highest
<br /> TPHg concentration was reported in MW-5, the highest benzene concentration was reported in MW-1, and the highest MTBE
<br /> ' concentration was reported in MW-6 TBA was reported above the laboratory detection limits in one well(MW-3)at a concentration of
<br /> 6 9 µg/L No DIPE, ETBE,TAME, 1,2-DCA, EDB,methanol,or ethanol concentrations were reported above their respective laboratory
<br /> detection linuts in any of the 8 wells sampled dung this monitoring event TPHg,benzene, and MTBE concentrations are illustrated on
<br /> Figure 2 andI historic,groundwater analytical results are presented in Table 1 Groundwater analytical results for fuel oxygenate and
<br /> additives 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 /> Recommendations Continue quarterly groundwater momtonng,sampling,and reporting
<br /> Summary'of Unusual Activity None
<br /> '
<br /> Agency Directive Requirements None
<br /> ' 2"d Quarter 2002 Groundwater Report EZ SERVE 4100878 ATC Associates Fnc 1 E� �' !
<br /> S 11E-Z Serve11008781Reports1FZ878(2002 Q2 GW Rpt)doe ATC Project No 43 25827 0025,
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