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Date: October 04,2004 <br /> z Quarter 3d Quarter,2004 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2168 <br /> Address 411 W Charter Way, Stockton_ , CA <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38466532 OL058 <br /> Primary Regulatory Agency San Joaquin County Environmental Health Department <br /> Assembly Bill 681 Status Property owned by Mr Bill Halverson <br /> WORK PERFORMED THIS QUARTER (Third 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and subrmtted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Third 2004): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1, MW-1 B, MW-1 C, MW-2, MW-3, MW-4, MW-5, <br /> MW-6, MW-7, MW-8, MW-813, MW-8C Sampled <br /> Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 21 94 to 26 45 feet below ground surface b s <br /> Groundwater Flow and Gradient Northeast to Southeast @ 0 001 to 0 005 feettfoot 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 litmtations <br /> • The reported results for toluene in samples MW-1, MW-2, MW-6, and MW-7 should be considered estimated <br /> due to a high relative percent difference reported between the associated LCS and LCSD <br /> • The reported results for 1,2-dichloroethane (1,2-DCA) in samples MW-1C, MW-8, and MW-8B should be <br /> considered estimated due to a high relative percent difference reported between the associated LCS and LCSD <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory to order to quantitate a <br /> target analyte <br /> is <br /> R MproccscV5 BP ARC0502]681Quurter]y1200413 QTR 0412163 GwMR 3Q04 dou Page 1 <br />