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'kyr <br /> i� Date: February 5,2004 <br /> Quarter: 4t°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.: 38466395.01-058 <br /> Primary Agency/Regulatory ID No.: Lori Duncan, San Joaquin County Environmental Health <br /> Department <br /> WORK PERFORMED THIS QUARTER (Fourth 2003): <br /> 1. Performed quarterly groundwater monitoring and sampling. Wells VW-5S and VW-513 were unable to be <br /> sampled or monitored due to insufficient water. <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 2004): <br /> I. 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 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 allons <br /> Current Remediation Techniques: Soil vapor extraction and airs ar ing <br /> Approximate Depth to Groundwater: 30.52 to 32.60 ft <br /> Groundwater Flow and Gradient: Northeast to Southwest @ 0.004 to 0.033 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Groundwater samples collected on 1218103: <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 total petroleum hydrocarbons as gasoline(TPHg)in sample MW-1 is due to a <br /> . discrete peak at CS (probably MtBE)and has been rejected. <br /> KAWpro nV5 BP ARCM0549mQuwer"QTR 031549 GWMR 4Q03.&c Page 1 <br />