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y <br /> 40 Date. January 6,2004 <br /> Quarter 4`'Quarter,2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 760 <br /> Address 225 South Cherokee Lane, Lodi, CA <br /> ARCO Environmental Engineer Paul Supple _ <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466244 OL058 <br /> Primary Agency/Regulatory ID No _San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property Owned by Gurpreet Dhatt and Kuldeep Dhatt <br /> WORK PERFORMED THIS QUARTER (Fourth 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Prepare a work plan to investigate the lateral and vertical extent of the 1,2-DCA contannnant plume as directed <br /> by the San Joaquin County Environmental Health Department Ietter dated November 17,2003 <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 /> . 3 Submit Additional Site Assessment Work Plan <br /> QUARTERLY RESULTS SUMMARY (Fourth 2003): <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling MW-1 through MW-3 sampled quarterly <br /> Frequency of Groundwater Monitoring _Quarterly _ ^ <br /> Is Free Product (FP) Present Onsite No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date None <br /> Current Remediation Techniques None <br /> Approximate Depth to Groundwater 61 14—62 49 feet below ground surface <br /> Groundwater Flow and Gradient Southeast @ 0 012 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding Mmes, <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 /> o The reported results for 1,2-dichloroethane (1,2-DCA) in sample MW-3 may be biased high as demonstrated by <br /> a high surrogate recovery due to matrix interference <br /> o The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte(s) <br /> K 1WM-esW5 RP ARCD(W601Q..m ly\4 QTR 031760 GWMR 4Q03 doe Page 1 <br />