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Date December 22,2004 <br /> Quarter 4`i'Quarter, 2004 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11191 <br /> Address 1469 East Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer ale Christie _ <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466550 OL058 <br /> Primary Agency/Regulatory ID No Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Fourth 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2005): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2004): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7, Quarter) <br /> Frequency of Groundwater Monitoring _ Quarterly <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 57 88 to 59 77 feet below ground surface b s <br /> Direction of Groundwater Flow Southwest <br /> Groundwater Gradient 0 001 to 0 007 feet/foot (ft/ft) <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records,blanks, dilutions, holding times, <br /> LCS/LCSD results,MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory <br /> with the following Iimitations <br /> • The reported results for gasoline range organics(GRO) in samples MW-1,MW-2,MW-4, and MW-5 are due to <br /> chromatographic peaks present in the gasoline quantitation range, however, the peaks present do not resemble <br /> the pattern for gasoline <br /> • The elevated reporting Iimits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> K�WPeucessU5 RP ARC0K1 1191%QU ater1y1200414 QTR 04111191 GWMR 4Q04 doc Page 1 <br />