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Date October 15,2002 <br /> Quarter: 3rd Quarter,2002 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 4493 <br /> Address 205 N Center St , Stockton, CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38465950 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department (SJCEHD) <br /> Assembly Bill 681 Status Property owned by City of Stockton <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 Conduct quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> . 3 Install down-gradient monitoring wells and replace damaged sidewalk sections <br /> QUARTERLY RESULTS SUMMARY (Third 2002): <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater MW-1 through MW-1 OD sampled quarterly <br /> Frequency of Groundwater Quarterly <br /> Is Free Product(FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 12 8 to 18 ft <br /> Groundwater Flow and Gradient Northeast 0 0 012 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the electronic and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, <br /> LCSILCSD results,MS/MSD results,and surrogate recoveries),the data are acceptable as reported by the laboratory <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 total petroleum hydrocarbons as gasoline (TPHG) analysis of sample MW4 the hydrocarbon <br /> pattern present is within the gasoline quantitation range but does not resemble the pattern for gasoline <br /> • In the TPHG analysis of samples MW-4 and MW-8M, the surrogate was outside the recovery limits <br /> due to matrix interference The results for TPHG in these samples should be considered estimated <br /> K U5 BP ARC0104493VQuwtnrW_QTR 02NGWMR do Page 1 <br />