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^� Date January 21,2004 <br /> Quartet' 4`h Quarter,2003 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2168 <br /> Address 411 CharterWay,y, 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 /> WORK PERFORMED THIS QUARTER (Fourth 2003): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (First 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Fourth 2003): <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-86, 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 21 to 25 96 feet below ground surface <br /> Groundwater Flow and Gradient Northeast to Southeast C 0 0017 to 0 0026 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 limitations <br /> • The elevated reporting limits reported in the Method 8260 analysis of samples MW-4, MW-6, and MW-7 were <br /> due to sample foaming <br /> • Based on historical data to addition to sample foaming, the reported results for samples MW-4 and MW-6 <br /> analyzed by Method 8260B have been rejected and shall be resampled and reevaluated next quarter In <br /> addition, the reported results for sample MW-7 analyzed by Method 8260B should be considered estimated due <br /> to sample foaming <br /> • The elevated reporting limits were the result of dilutions performed by the laboratory to order to quantitate a <br /> target analyte(s) <br /> K lwpri.essv5 6P ARCo50 MSV8 ,=r r"QTR 03\2168 GWMR 4Q03 do Page 1 <br />