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Date May 11,2004 <br /> Quarter: J." Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 4493 <br /> Address 205 N Center St , Stockton, CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466267 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> Assembly Bill 681 Status Property owned by City of Stockton _ <br /> WORK PERFORMED THIS QUARTER (First 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2004): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Submit site assessment report <br /> QUARTERLY RESULTS SUMMARY (First 2004): <br /> Current Phase of Project Mon iton n g/Assessment <br /> Frequency of Groundwater Sampling MW-1 through MW-12D 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 13 37 to 24 95 ft <br /> Groundwater Flow and Gradient Northeast @ 0 016 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Please note that during 2003, the laboratory has changed Total Petroleum Hydrocarbons as Gasoline (TPHg) to <br /> Gasoline Range Organics (GRO) The resulting data may be impacted by the potential inclusion of non-TPHg <br /> analytes within the requested carbon range resulting in a higher concentration being reported Where the resulting <br /> GRO concentration is based on a single analyte (m e, a non-TPHg analyte or a single TPHg analyte), the analyte will <br /> be identified if possible <br /> Based on the review of the electronic 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 elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate <br /> • a target analyte(s) <br /> K\Wpmces\!5 BP ARC0\044931QLmuriy\1 QTR 44\4493 GWMR 1Q44 doe Page 1 <br />