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Date: February 19,2003 <br /> Quarter:4th Quarter,2002 <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.: 38465879.00436 <br /> Primary Agency/Regulatory ID No.: Lori Duncan, San Joaquin County <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 of the SVE and AS systems. <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. Perform operation and maintenance of the SVE and AS systems. <br /> QUARTERLY RESULTS SUMMARY (Fourth 2002): <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: Quarterix <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: 8.67 to 31.00 ft <br /> Groundwater Flow and Gradient: Northeast @ 0.002 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Groundwater samples collected on 12/4/02.- <br /> Based <br /> 2/4/02: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 /> • Samples VW-2,VW-3, VW-4 and VW-5S exceeded the 20 samples per batch QC criteria. Since other <br /> QC requirements were met,the data is acceptable. <br /> • The reported results for the total petroleum hydrocarbons as gasoline(TPHg)in samples VW-1,VW-2, <br /> . VW-3,and VW-4 were due to a high relative percent differrnce(RPD)between the LCS and LCSD. <br /> KN5 se nxco\00549+4 QTR 02`549 cwMR4Qo2_do- Page 1 <br />