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Date: February 17,2003 <br /> Quarter: 4h 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 Eiarth <br /> Consultant Project No: 38466080.0036 <br /> Primary Agency/Regulatory ID No: San Joaquin County (SJC)_ <br /> Assembly BIII 681 Status: Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Fourth 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 air sparge(AS) system. <br /> WORK PROPOSED FOR NEXT QUARTER (First 2003): <br /> 1. Perform quarterly groundwater monitoring and sampling. <br /> 2. Prepare and submit quarterly groundwater monitoring report. <br /> 3. Restart and perform operation and maintenance on AS systems. <br /> • QUARTERLY RESULTS SUMMARY (Fourth 2002): <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 1 st and Td 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 currently off) <br /> TPHG removed by SVE this Quarter: None <br /> Cumulative TPHG Removed: 3,616.6 lbs <br /> Approximate Depth to Groundwater: 8.33— 11.96 ft <br /> Groundwater Flow and Gradient: Northeast to Southeast @ 0.002 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 /> LCSILCSD results,MS/MSD results,and surrogate recoveries), the data are acceptable as reported by the laboratory <br /> with the following limitations: <br /> • The Method 8015/8021 results for samples ATR-2, ATR-7, ATR-8 and ATR-12 may be biased low <br /> because the analyses were performed 3 days beyond the EPA recommended holding time of 14 days from <br /> • collection. <br /> K:V5 SP ARCO}0209314Q02�2093 GWMR4Q02.doc Page 1 <br />