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Date lune 28,2005 <br /> Quarter 2"Quarter,2005 <br /> • <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 11194 <br /> Address 2375 Tracy_Blvd, Tracy, CA <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS/Jeffrey Brooks _ <br /> Consultant Project No 38466552 OA 143 <br /> Primary Agency/Regulatory ID No San Joaquin Coun Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Conoco Phillips <br /> WORK PERFORMED THIS QUARTER (Second 2005): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2005): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Prepare workplan for additional site assessment <br /> QUARTERLY RESULTS SUMMARY (Second 2005): <br /> Current Phase of Project Monitoring _ <br /> Frequency of Groundwater Sampling MW-4, MW-6, MW-7, AMW-3, AMW-5, and AMW-6— - <br /> Quarterly, MW-1, MW-2, MW-3, MW-5, MW-8, AMW-1, <br /> AMW-2, and AMW-4—Annually 3`d Quarter <br /> Frequency of Groundwater Monitoring All Wells 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 _ 4 39 to 7 20 feet below ground surface (bgs) <br /> Direction of Groundwater Flow Northwest �— <br /> Groundwater Gradient 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 elevated reporting limits were the result of dilutions performed by the Iaboratory in order to quantitate a <br /> target analyte <br /> K Mproc ssV5 BP AROMA I]941Quaner1y12005V2 QTR 05%11194 GWMR 2W doc Page 1 <br />