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' DATE January 22, 2003
<br />' . QUARTERLY GROUNDWATER MONITORING REPORT—FOURTH QUARTER 2002
<br /> Facility Former E-Z Serve No 100878 Site Address 1012 West Yosenute Avenue,Manteca,California
<br /> Responsible P /Contact Person RPMS-CA/Jeff Burke,Pro ect Manager
<br /> Consulting Co /Contact Person ATC Associates Inc /Michael T Davis Project Manager 85$ 569-0692
<br /> ATC Project No 43 25827 0025
<br /> RegulatoryA enc /File Noi County of San Joaquin,Environmental Health Division/1452
<br /> WORK PERFORMED THIS QUARTER [October 1,2002--December 31,20021
<br /> 1 Performed fourth quarter groundwater monitoring and sampling
<br /> 2 Prepared fourth quarter groundwater monitoring report
<br /> I WORK PROPOSER FOR NEXT QUARTER [January 1,2003—March 31,2003]
<br /> 1 Perforin first quarter groundwater monitoring and sampling
<br /> 2 Submit first quarter groundwater monitoring report
<br /> Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl uarter] ,etc
<br /> Frequency of Monitoring Quarterly (Monthly,etc
<br /> Liquid Phase H drocarbons 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 1085 Gallons
<br /> Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recovery)
<br /> Approximate Depth to Groundwater 16 51 to 18 11 (Measured Feet
<br /> Groundwater Gradient 0 002 ft/ft (Magnitude)
<br /> Groundwater Flow Direction Northwesterly (Direction)
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<br /> Discussion On November 22, 2002, ATC Associates,Incorporated(ATC)personnel gauged 8 groundwater monitor wells(Figures I and
<br /> 2) Depth to groundwater ranged between 16 51 (MW-7)to 18 11 (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 November 22, 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 characterized as
<br /> gasoline(TPHg),benzene,toluene, ethylbenzene,and total xylenes(BTEX), fuel oxygenates methyl tert-butyl ether(MTBE),di-isopropyl
<br /> ether(DIPS),ethyl tert-butyl ether(ETRE),tent-amyl methyl ether(TAME), and tert-butyl alcohol(TBA), ethanol,and methanol by EPA
<br /> Test Method 8260B and GC/MS Combination TPHg concentrations above the laboratory Practical Quantitation Limit (PQL) of 50
<br /> micrograms per liter (gg/L) was reported in 3 of the 8 wells sampled this quarter Benzene concentrations were reported below the
<br /> laboratory PQL ranging from 0 50 to 2 0µg/L in groundwater samples collected from all 8 wells sampled this quarter The highest TPHg
<br /> concentrations reported was reported in samples collected from MW-5 at a reported concentration of 5,400 µg/L MTBE, DIPE, ETRE,
<br /> TAME, and methanol concentrations were reported below their respective laboratory PQL in any of the 8 wells sampled during this
<br /> monitoring event TSA was reported in groundwater samples collected from MW-1, MW-2, MW-3,and MW-6 at concentrations of 11,
<br /> I 10, 24, and 19 lig/L, respectively Ethanol was reported in samples collected from one well (MW-6) at a reported concentration of 3 0
<br /> µg/L TPHg,benzene, and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in
<br /> Table I Groundwater analytical results for fuel oxygenate and additives are presented in Table 2 Hydrographs of groundwater elevations
<br /> and analytical data are attached in Appendix B and complete laboratory analytical results and chain-of-custody documentation are attached
<br /> in Appendix C
<br /> Recommendations Continue quarterly groundwater monitoring,sampling,and reporting Remove methanol from the quarterly
<br /> groundwater analytical scheme since results remain below the laboratory PQL
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<br /> 4'h Quarter 2002 Groundwater Report EZ SERVE 9100878 ATC ASSOcdates Int
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