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' DATE Janupa 23 2003
<br /> QUARTERLY GROUNDWATER MONITORING REPORT—FOURTH QUARTER 2002
<br /> Facility Former E-Z Serve No 100966 Site Address 2537 Waterloo Road,Stockton,California
<br /> L Res onsible P 1 Contact Person RPMS-CA/Jeff Burke
<br /> Consulting Co /Contact Person ATC Associates Inc /Michael T Davis Project Manager 858 569-0692
<br /> ATG Pro ect No 43 25827 0026
<br /> Re lato A enc /CRW C$ Case No Coun of San Joa uin De artmcnt of Environmental Health/390499
<br /> WORK PERFORMED THIS QUARTER (October 1,2002—December 31,2002]
<br /> 1 Performed fourth quarter groundwater monitoring and sampling
<br /> 2 Initiate permitting to conduct on-and off-site soil and groundwater assessment and remediation well installation
<br />' 3 Prepared fourth quarter groundwater monitoring report
<br /> 4 Perform remediation feasibility testing
<br /> WORK PROPOSED FOR NEXT QUARTER [January 1,2003—March 31,20031
<br /> 1 Prepare and submit Corrective Action Plan(CAP)
<br /> 2 Perform first quarter groundwater monitoring and sampling
<br /> 3 Submit first quarter groundwater monitoring report
<br /> 1 Current Phase of Project Assessment Assessment,Remediation,etc
<br /> Frequency of Sampling uarterl (Quarterly,etc
<br /> Frequency of Monitoring Quarterly (Monthly,etc
<br /> Liquid Phase Hydrocarbons Present Crn Site No es/No
<br /> Cumulative PSH Recovered to Date Unknown Gallons
<br /> PSH Recovered This Quarter None Gallons
<br />'.)
<br /> Purge Water Removed This Quarter 385 Gallons
<br /> Permits for Discharge None PES,POTW etc
<br /> Current Remediation Techniques None SVES,PSH Recove
<br /> Approximate Depth to Groundwater 57 97 to 58 75 (Measured Feet
<br /> Groundwater Gradient 1 0 006 Wft (Magnitude)
<br /> Groundwater Flow Direction Northwester] (Direction)
<br /> Discussion On November 20, 2002, ATC Associates, Incorporated (ATC) personnel gauged purged and sampled 12 groundwater
<br /> monitor wells and 3 vapor extraction wells (VW-1, VW-2, and VW-3) at the site (Figures 1 and 2) Depth to groundwater ranged
<br /> between 57 97(MW-6)to 58 75 (MW-7)feet below ground surface(bgs) The direction of groundwater flow was northwesterly with a
<br /> calculated hydraulic gradient of approximately 0 006 ft/ft, respectively(Figure 2) No measurable phase-separated hydrocarbons (PSH)
<br /> were recorded during this monitoring event Groundwater elevations and contours are illustrated on Figure 2 and groundwater-
<br /> monitoring data is presented in Table 1
<br /> On November 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,MW-4,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 (DIPE), ethyl tcrt-butyl ether (ETBE), tert-
<br /> amyl methyl ether (TAME), and tent-butyl alcohol (TBA), 1,2-dichlorethane (1,2-DCA), and 1,2-dibromoethane (EDB), ethanol, and
<br /> methanol by EPA Test Method 8260B and GC/MS Combination TPHg concentrations were reported above the laboratory Practical
<br /> Quantitation Limit (PQL) of 50 micrograms per liter(pg/L) in groundwater samples collected from 7 of the fifteen (15)wells sampled
<br /> this quarter The highest TPHg, benzene, and MTBE concentrations reported were 16,000, 8,300, and 430 gg/L, respectively, in the
<br /> groundwater samples collected from VW-1 TBA was detected above the laboratory PQL ranging from 5 0 to 1,000 µg/L in 4 wells
<br /> sampled, the highest concentration reported was 160 µg/L in groundwater samples collected from MW-9 and VW-2 1,2-DCA
<br /> concentrations were reported above the laboratory PQL ranging from 0 5 to 100 µg/L in 13 wells, the highest 1,2-DCA concentration
<br /> reported was 64 gg/L in groundwater samples collected from MW-10 EDB,TAME,and DIPE concentrations were reported below their
<br /> laboratory PQL ranging from 0 5 to 1,000 µg/l,in the 15 wells sampled Methanol and ethanol concentrations were reported below the
<br /> laboratory PQL ranging from 50 to 10,000 }ig/I,and 500 µg/L, respectively, in the 15 wells sampled this quarter TPHg, benzene, and
<br /> • MTBE concentrations are illustrated on Figure 2 and historic groundwater analytical results are presented in Tables 1 and 2
<br /> 4`h Quarter 2001 Groundwater Report E-Z SER YE #100966 ATC Associates Inc
<br /> S 11E-Z Serve11009661Reports11EZ966GWR001 doc ATC Project No 43 25927 0026
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