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Date January 19,2006 <br /> Quarter 4`h Quarter,2005 <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/Vernon Elarth <br /> Consultant Project No 38466552 OA143 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Pra ert awned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Fourth 2005): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2006): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2005): <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—Annually 3`d Quarter <br /> Frequency of Groundwater Monitoring All Wells 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 4 85 to 7 35 feet below ground surface (bgs) _ <br /> Direction of Groundwater Flow North-Northwest <br /> Groundwater Gradient 0 008 feet/foot (fVft) _ <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records,blanks,dilutions, holding times, <br /> LCSILCSD results,MS/MSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following limitations <br /> • The reported result for ethanol in sample MW-6 may be biased because the associated continuing calibration <br /> standard was outside of acceptance criteria <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> K NWpwcess1J5 BP ARCO\11194%Q.� Ay\200514 QTR 4511 4144 CViMR 4Q05 d., Page 1 <br />