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0 <br />0) <br />Date: October 28, 2004 <br />Quarter, 3rd Quarter, 2004 <br />ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br />Facility No <br />Address <br />Environmental Engineer <br />Consulting Co /Contact Person <br />Consultant Project No <br />Primary Agency/Regulatory ID No <br />Assembly Bill 681 Status <br />4493 <br />205 N Center St , Stockton, CA <br />_Paul Supple _ <br />URSNernon Elarth <br />38466465 OL058 <br />San Joaquin County Environmental Health Department <br />SJCEHD <br />Propeowned by City of Stockton <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 Conduct 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 <br />Frequency of Groundwater Sampling <br />Frequency of Groundwater Monitoring <br />Is Free Product (FP) Present Onsite <br />Current Remediation Techniques <br />Approximate Depth to Groundwater <br />Groundwater Flow and Gradient <br />ANALYTICAL DATA REVIEW: <br />Monitoring/Assessment <br />MW -1 through MW -12D sampled quarterly <br />Quarterly <br />No <br />Natural attenuation <br />14 75 to 27 26 feet below ground surface (bgs) <br />Northeast @ 0 01 feet/foot (ft/ft) <br />Based on the review of the electronic and hardcopy data (chain -of -custody records, blanks, dilutions, holding times, <br />LCSILCSD results, MSIMSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory <br />with the following limitations <br />• The reported results for cis-1,2-dichloroethene and trichloroethene (TCE) in sample MW -10D may be <br />biased high as demonstrated by a high surrogate recovery due to matrix interference <br />• The elevated reporting limits were the result of dilutions performed by the laboratory in order to <br />quantitate a target analyte <br />K 1Wpmcem \J5 RP ARCON044931QuarterW QTR 0414493 CWMR 3Q04 doc <br />Page 1 <br />