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Date: May 19,2003 <br /> Quarter: I" Quarter,2003 <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 (First 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 (Second 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 (First 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: 11.04 to 29.34 ft - <br /> Groundwater Flow and Gradient: Southeast @ 0.03 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 limitations: <br /> • The reported results for 8260B in sample VW-513 may be biased low since the analyses for these <br /> analytes were performed 8 days beyond the U.S.EPA recommended holding time of 14 days. <br /> • Elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate <br /> a target analytes. <br /> K:1Wpio ssV5 BY ARCOMS49\1 QTR 03\448 GWMR IQ03,dn Page 1 <br />