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Date- February 2,2004 <br /> Quarter 41h Quarter,2003 <br /> QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy Blvd,Tracy, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466552 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 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and subrmtted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2003): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling AMW-1 through AMW-6, MW-1 through MW-8 Quarter! <br /> Frequency of Groundwater Monitoring 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 4 49 to 7 41 feet below ground surface <br /> Direction of Groundwater Flow Northwest <br /> Groundwater Gradient 0 007 feettfoot <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 benzene, ethylbenzene, and methyl tert-butyl ether (MtBE) In sample MW-4 may be <br /> biased high as demonstrated by a high surrogate recovery due to matrix interference <br /> • Elevated reporting luruts were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte(s) <br /> K 1Wproeess JS BP ARcul 11941Quam,ty�4 QTR 03\1 1194 QMR 4Q03 do Page 1 <br />