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DATE October 1 2002
<br /> F. QUARTERLY GROUNDWATER MONITORING REPORT—THIRD QUARTER 2002
<br />' Facih Former E-Z Serve No 140966 Site Address 2537 Waterlooa
<br /> Road, Stockton,California
<br /> Responsible Party/Contact Person RPMS-CA/Jeff Burke
<br />' Consultin Co /Contact Person ATC Associates Inc /Michael T Davis,Project Manager 858 569-0692
<br /> ATC Pra ect No 43 25827 0026
<br /> Regulatory A enc /CRM CB Case No County of San Joa um Department of Environmental Health/390499
<br />' WORK PERFORMED THIS QUARTER [July 1,2002—September 30,2002]
<br /> 1 Performed third quarter groundwater monitoring and sampling
<br /> 2 Initiate pemutting to conduct on-and off-site soil and groundwater assessment and remediation well installation
<br /> 3 Prepared third quarter groundwater monitoring report
<br /> WORK PROPOSED FOR NEXT QUARTER [October 1,2002—December 31,2002]
<br /> 1 Conduct on-and off-site soil and groundwater assessment and remediation well installation
<br />' 2 Perform remediation feasibility testing
<br /> 3 Perform fourth quarter groundwater monitoring and sampling
<br /> 4 Submit fourth quarter groundwater monitoring report
<br />' Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl (Quarterly,etc
<br /> Frequency of Monitonng Quarterly (Monthly,etc
<br />'
<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 This Quarter 385 Gallons
<br />'• Permits for Discharge None PES,POTW,etc
<br /> Current Remediation Techniques None SVES,PSH Recovery)
<br /> Approximate Depth to Groundwater 57 50 to 58 33 Measured Feet
<br /> Groundwater Gradient 0 006 ft/ft (Magnitude)
<br />' Groundwater Flow Direction I Northwesterly. Direction
<br />' Discussion On August 20, 2002, ATC Associates, Incorporated(ATC)personnel gauged purged and sampled 12 groundwater monitor
<br /> wells and 3 vapor extraction wells at the site(Figures 1 and 2) Depth to groundwater ranged between 57 50 (MW-6)to 58 33 (MW-9)
<br /> feet below ground surface (bgs) The direction of groundwater flow was northwesterly with a calculated hydraulic gradient of
<br /> approximately 0 006 ff/ft, respectively (Figure 2) No measurable phase-separated hydrocarbons (PSH) were recorded during this
<br />' monitoring event Groundwater elevations and contours are illustrated on Figure 2 and groundwater-monitoring data is presented in Table
<br /> 1
<br /> On August 20, 2002, ATC collected groundwater samples from 12 monitor and 3 vapor extraction wells ATC utilized the attached
<br /> sampling procedures described in Appendix A to collect groundwater samples from MW-1,MW-2,MW-3,MW4,MW-5,MW-6,MW-
<br /> 7, MW-8, MW-9, MW-10, MW-11, MW-12, VW-1, VW-2, and VW-3 Field logs are also included in Appendix A Groundwater
<br /> samples collected were analyzed for total petroleum hydrocarbons characterized as gasoline(TPHg),benzene,toluene,ethylbenzene,and
<br /> total xylenes (BTEX), fuel oxygenates methyl tert-butyl ether (MTBE), di-isopropyl ether (RIPE), ethyl tert-butyl ether (ETBE), tert-
<br /> amyl methyl ether (TAME), and tert-butyl alcohol (TBA), 1,2-dichlorethane (1,2-DCA), and I,2-dibromoethane (EDB), by EPA Test
<br /> Method 8260, and methanol and ethanol by EPA Test Method 8015 TPHg concentrations were reported above the laboratory detection
<br /> limit of 50 micrograms per liter (gg/L) in 8 of the fifteen wells sampled The highest TPHg, benzene, and MTBE concentrations
<br /> reported were 7,200, 4,900, and 280 pg/L respectively in the groundwater samples collected from VW-I TBA was detected above the
<br /> laboratory detection linut of 5 0 pg/L in 10 wells sampled, the highest concentration reported was 160 gg/L in samples collected from
<br /> MW-9 ETBE concentrations were detected above the laboratory detection limit of 1 0 pg/L in 5 wells sampled, the highest
<br /> concentration reported was 11 pg/L in samples collected from MW-10 and MW-I2 1,2-DCA concentrations were reported in 13 wells,
<br /> the highest 1,2-DCA concentration reported was 200 pg/L in groundwater samples collected from MW-10 TAME and DIPE
<br /> concentrations were reported below their laboratory detection limit of 10 pg/L in all 15 wells sampled No methanol or ethanol
<br /> concentrations were reported above the laboratory detection limits of 1,000 pg/L in any of the 15 wells sampled this quarter TPHg,
<br /> benzene,and MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in Tables I and 2
<br /> Hydrographs of groundwater elevations and analytical data are attached in Appendix B and complete laboratory analytical results and
<br /> chain-of-custody documentation are attached in Appendix C
<br /> ire Quarter 2002 Groundwater Report E-Z SERYE #100966 ATC Associates lnc
<br /> S 11E-Z Serve11009661Reports11EZ966(2002 Q3 GW Rpt)doe ATC Project No 43 25827 0026
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