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Date July 31,2002 <br /> Quarter- 2°d Quarter,2002 <br /> 'i <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 URS/Vernon Elarth <br /> Consultant Project No J5-00004493 01 <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 (Second 2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Prepared and submitted work plan for monitoring well installation and sidewalk repair <br /> WORK PROPOSED FOR NEXT QUARTER (Third 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 (Second 2002): <br /> Current Phase of Project Monitoring/Assessment <br /> Frequency of Groundwater Sampling MW-1 through MW-7 sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 12 2 to 17 3 ft <br /> Groundwater Flow and Gradient East-Northeast @ 0 019 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 /> LCS/LCSD results,MS/MSD results,and surrogate recoveries),the data are acceptable as reported by the laboratory <br /> with the following limitations <br /> In the TPHg analysis of samples MW-2 and MW-5,the hydrocarbon pattern present is within the gasoline <br /> quantitation range but does not resemble the pattern for gasoline <br /> In the TPHg1BTEX analysis of sample MW-2,the surrogate was outside recovery limits due to matrix <br /> interference The results for TPH-g/BTEX in these samples should be considered estimated <br /> K US IV ARC004493\Qu.M.1y%_QTR 02%WMR d. Page 1 <br />