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Date. November 4,2002 <br /> Quarter 3rd Quarter,2002 <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 38465904 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Heath Services SJCPHS <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Third 2002)- <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Performed operation and maintenance on soil vapor extraction/air sparge(SVE/AS) systems <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 PerfOTM operation and maintenance on SVE/AS systems <br /> • QUARTERLY RESULTS SUMMARY (Third 2002). <br /> } <br /> Current Phase of Project Monitoring/Remediation <br /> Frequency of Groundwater Sampling ATR-2, ATR-4, ATR-5, ATR-7, ATR-8, and ATR-12 <br /> sampled quarterly, ATR-1, ATR-3,ATR-6, ATR-9, ATR-10, <br /> and ATR-11 sampled 15'and 3'd quarters only <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 SVE/AS SVE system current) off <br /> TPHG removed by SVE this Quarter None <br /> Cumulative TPHG Removed 3,616 6 lbs <br /> Approximate Depth to Groundwater 9 1 -- 12 8 ft <br /> Groundwater Flow and Gradient North to Northeast @ 0 01 ft/ft <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 exceptions <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a target <br /> analyte <br /> K 1i5 BP ARCOW0931QuarterW-QTR 0212093 G WMR3QO2 doc Page 1 <br />