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Date: December 20,2002 <br /> Quarter: 3rd 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 Public Health Services <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 of the SVE and 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. Perform operation and maintenance of the SVE and AS systems. <br /> QUARTERLY RESULTS SUMMARY (Third 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 /> 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: 12.7 to 31.0 ft <br /> Groundwater Flow and Gradient: Northeast @ 0.005 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 /> • Elevated reporting limits were the result of dilutions performed by the laboratory. <br /> • The TPHg analysis for samples MW-1,VW-2,VW-4,and VW-5D the hydrocarbon patterns present <br /> are within the gasoline quantification range but do not resemble the pattern for gasoline. <br /> i . <br /> KA5 BP ARCO\W543\3_QTR 02\546 GWMR3Q02.dn Page 1 <br />