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l <br /> Date: August 19,2004 <br /> L Quarter- 3'd Quarter,2004 <br />• ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11191 <br /> Address 1469 East Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer Kyle 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 Prop" owned by Conoco Phillips <br /> I <br /> WORK PERFORMED THIS QUARTER (Third 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Third 2004): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7, Quarterly <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 53 96 to 55 71 feet below ground surface (bgs) _ <br /> Direction of Groundwater Flow Northwest to Southwest <br /> Groundwater Gradient 0 001 to 0 004 feet/foot (ft/ft) <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (cham-of-custody records, blanks, dilutions, holding times, <br /> LCSII.CSD results,MS/MSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> I <br /> with the following limitations <br /> I <br /> • The reported results for gasoline range organics (ORO) in samples MW-1, MW-2, MW-3, MW-4, and MW-5 <br /> are due to a discrete peak at C5 (probably MtBE) <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> K XWprocees\J5 IIP ARCU�11191\(wv erly"QTR Ua111191 GWMR 3QO4 doc Page 1 <br />