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Date: January 20,2005 <br /> Quarter. 4'b 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 CoXontact Person URS/Vernon Elarth <br /> Consultant Project No 38466457 OA143 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department SJCEHD <br /> Assembly Bill 681 Status -Propeqy owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Fourth 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Preparing site closure report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2005): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Submit closure report to SJCEHD <br /> • QUARTERLY RESULTS SUMMARY (Fourth 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 15t quarter <br /> Frequency of Groundwater Monitoring Quarterly <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 8 96 to13 17 feet below groundsurface (bgs) <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,MSIMSD results, and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following lirrutation <br /> • The reported results for ethylbenzene and total xylenes in sample ATR-5 may be biased low due to a low <br /> average percent recovery reported in the associated MS/MSD analysis <br /> K 1Wpmcessl15 BP ARC010209RQuerte ly12004W QTR 9412093 GW'MR 4Q04&c Page 1 <br />