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Date: July 29,2003 <br /> Quarter: 2"a Quarter,2003 <br /> • <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 548 <br /> Address: 1612 Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer: Paul Supple _ <br /> Consulting Co./Contact Person: URS/Vernon Elarth <br /> Consultant Project No.: 38466082.00336 <br /> Primary Agency/Regulatory ID No.: Lori Duncan, San Joaquin County Environmental Health <br /> Department <br /> WORK PERFORMED THIS QUARTER (Second 2003): <br /> 1. Performed quarterly groundwater monitoring and sampling. <br /> 2. Prepared and submitted quarterly groundwater monitoring report. <br /> 3. Performed operation and maintenance of the SVE and AS systems. <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2003): <br /> 1. Perform quarterly groundwater monitoring and sampling. <br /> 2. Prepare and submit quarterly groundwater monitoring report. <br /> 3. Perform operation and maintenance of the SVE and AS systems. <br /> QUARTERLY RESULTS SUMMARY (Second 2003): <br /> Current Phase of Project: Remediation <br /> Frequency of Groundwater Sampling: Wells MW-1 through MW-6 and VW-1 through VW-5 <br /> sampled Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Is Free Product (FP) Present Onsite: No <br /> FP Recovered this Quarter: None <br /> Cumulative FP Recovered to Date: 7 gallons <br /> Current Remediation Techniques: Soil vapor extraction and air sparging <br /> Approximate Depth to Groundwater: 10.88 to 29.04 ft <br /> Groundwater Flow and Gradient: Southeast @ 0.02 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Groundwater samples collected on 613/03: <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 limitations: <br /> • The reported results for toluene in sample VW-5D should be considered estimated since the primary <br /> • and confirmation results varied by greater than 40%relative percent difference. <br /> K:1WMKessVS BP ARCo%00546\Quartedy\2 QTR 03\548 GWMR 2Q03.d,,e Page 1 <br />