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Date October 6,2004 <br /> Quarter 3rd Quarter,2004 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd, Tracy, CA _ <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS/Jeff re Brooks <br /> Consultant Project No 38466552 0L058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <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 /> 3 Prepared and submitted cross-sections and a well construction data table in the quarterly groundwater <br /> monitoring report as requested by the San Joaquin County Environmental Health Department(SJCEHD) <br /> 4 Modified monitoring well sampling schedule with SJCEHD concurrence <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2004)- <br /> 1 Perform quarterly groundwater monitoring and sampling according to modified schedule <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-4, MW-6, MW-7, AMW-3, AMW-5, and AMW-6 <br /> Quarterly, MW-1, MW-2, MW-3, MW-5, MW-8, AMW-1, <br /> AMW-2, and AMW-4 Annual <br /> Frequency of Groundwater Monitoring All Wells Quarter <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 5 21 to 7 68 feet below ground surface (bgs) <br /> Direction of Groundwater Flow Northwest <br /> Groundwater Gradient 0 005 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 limitations <br /> • The reported results for methyl tert-butyl ether (MtBE) in sample MW-6 should be considered estimated due to <br /> a high relative percent difference reported between the associated MS and MSD <br /> K\Wp—es IJ5 PP ARCOV 119MQuarterly\200413 QTR 0411194 GWMR 3W doe Page 1 <br />