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4 <br /> Date March 23,2005 <br /> Q> Quarter 1"Quarter,2005 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11191 <br /> Address 1469 East Hammer Lane, Stockton, CA <br /> ARCO Environmental Engineer _Kyle Christie <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466550 OA143 <br /> Primary Agency/Regulatory ID No Harlin Knoll <br /> San Joaquin County Environmental Health_Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (First 2005): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Second 2005): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> i <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (First 2005): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-7, Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 52 07 to 54 67 feet below ground surface (bgs) <br /> Direction of Groundwater Flow ^Southeast to Northeast <br /> Groundwater Gradient 0 002 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 lirrutations <br /> • The reported results for gasoline range organics (GRO) in samples MW-1, MW-2, MW-3, MW-4, and MW-5 <br /> are due to discrete peaks in the quantitation range (probably methyl tert-butyl ether (MtBE) in samples MW-1, <br /> MW-2,MW-4,and MW-5 and tert-butyl alcohol (TBA) in sample MW-3) <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> K Mproce 05 BP ARC6111191NQuanerly\2005%)QTR 051]k 191 GWMR IQ05 dm Page 1 <br />