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Date October 21,2004 <br /> Quarter. 3'Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02093 <br /> Address 3425 Tracy Blvd ,Tracy, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466457 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department SJCEHD <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Third 2004): <br /> l 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 Perform 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 Monitoring <br /> Frequency of Groundwater Sampling ATR-5 and ATR-8 sampled Quarterly <br /> ATR-1 through ATR-4, ATR-6, ATR-7, and ATR-9 through <br /> ATR-12 sampled Annually 1s` uarter <br /> Frequency of Groundwater Monitoring Quarter) <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <1 gallon <br /> Current Remediation Techniques Natural Attenuation <br /> TPHG removed by SVE this Quarter None <br /> Cumulative TPHG Removed 3,616 6 lbs <br /> Approximate Depth to Groundwater 9 10 to13 11 feet below ground surface b s <br /> Groundwater Flow and Gradient Northwest-East at 0 002 - 0 005 feet/foot (ft/ft) <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the electronic 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 <br /> laboratory <br /> DISCUSSION: <br /> Methyl tent-butyl ether (MtBE) was the only analyte detected above laboratory reporting limits in groundwater <br /> samples collected from site wells this quarter MtBE concentrations continued to decrease in ATR-5 this quarter In <br /> ATR-8,MtBE was detected above Iaboratory reporting limits at a concentration consistent with historical data <br /> K 1WprocessV5 BP ARC0V020931Qua"er1yl3 QTR 04~2093 GWMR 3Q04 doc Page 1 <br />