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Date; January 5,2005 <br /> r Ouarter: 4's Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No.: 5450 <br /> Address: 1617 West Fremont Street, Stockton, CA <br /> ARCO Environmental Engineer: Paul Supple <br /> Consulting Co./Contact Person: URS/Jeff rey Brooks <br /> Consultant Project No.: 38466523.01-058 <br /> Primary Agency/Regulatory ID No.: San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status: Property owned by Atlantic Richtield Company <br /> WORK PERFORMED THIS QUARTER (Fourth 2004): <br /> 1. Performed quarterly groundwater monitoring and sampling. <br /> 2. Prepared and submitted quarterly groundwater monitoring report. <br /> 3. Prepared and submitted Sensititve Receptor Survey report. <br /> WORK PROPOSED FOR NEXT QUARTER (First 2005): <br /> 1. Perform quarterly groundwater monitoring and sampling. <br /> 2. Prepare and submit quarterly groundwater monitoring report. <br /> QUARTERLY RESULTS SUMMARY (Fourth 2004): <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: MW-2 through MW-4 sampled quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Is Free Product (FP) Present Onsite: No <br /> Current Remediation Techniques: Natural attenuation <br /> Approximate Depth to Groundwater: 11.18—11.52 feet below ground surface (bgs) <br /> Groundwater Flow and Gradient: ^Southeast @ 0.004 feet/foot(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 limitation: <br /> • The reported results for gasoline range organics (GAO) in samples MW-2, MW-3, and MW-4 may be <br /> biased low since the analyses for these analytes were performed 1 day beyond the U.S. EPA recommended <br /> holding time of 14 days. <br /> K%Wpro mVS BP ARC0\054501Quaner1y0004\4 QTR 04\5450 GWW 4Q04.doc Page 1 <br />