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r! <br /> Date January 6,2003 <br /> Quarter 3rd Quarter,2002 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2168 <br /> Address 411 Charter Way, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No 38465939 00436 <br /> Primary Regulatory Agency San Joaquin County Public Health Services <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield <br /> WORK PERFORMED THIS QUARTER (Third 2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Third 2002): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1, MW-1A, MW-4A, MW-5, MW-7, MW-8, MW-8A, <br /> MW-8D, MW-12 through MW-18, AND MW-21 through <br /> MW-25 Sampled Quarter) <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 20 78 to 25 18 ft below ground surface <br /> Groundwater Flow and Gradient Northeast to East @ 0 002 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 Iaboratory <br /> with the following limitations <br /> • Elevated reporting limits were due to dilutions performed by the laboratory in order to quantitate a <br /> target analyte <br /> • In the 8260 analysis of samples MW-1, MW-3, MW-5, and MW-6 the reporting limits were elevated <br /> due to high levels of non-target analytes All samples had high levels of hydrocarbons <br /> • In the total petroleum hydrocarbons as gasoline (TPHg) analysis of samples MW-1 through MW-4, <br /> MW-7 and MW-8 the hydrocarbon pattern present is within the gasoline quantitation range but does <br /> not resemble the pattern for gasoline <br /> K V5 RP ARC01W16B\3_QTR 0252168 GWMR3Q02 dcx Page 1 <br />