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Date January 30,2002 <br /> • Quarter 4Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamm Holt Dr,Stockton,CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Project No 077 43235 804 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Health Services(SJCPHS) <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Fourth Quarter - 2001): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Operated and maintained air sparge(AS)system <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter- 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> . 3 Operate and maintain AS system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Remediation <br /> Frequency of Groundwater Sampling E-2,E-8 through E-12,PR-1,BHD-1,MW-4,and MW-5 <br /> sampled quarterly,E-3 through E-7,PR-2,BHD-2,MW-1, <br /> MW-2,and MW-3 sampled 151 and 3`4 quarters only <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite No <br /> Cumulative FP Recovered to Date 642 lbs <br /> Cumulative TPHg removed by GWE 3,980 lbs <br /> Total groundwater extracted 32,000,000 gal <br /> Current Remediation Techniques Soil-vapor extraction(SVE)/AS <br /> TPHg removed by SVE this quarter None — <br /> Cumulative TPHg removed by SVE 4,897 lbs <br /> MtBE Removed this Quarter None <br /> Cumulative MtBE Removed 4 5 lbs <br /> Approximate Depth to Groundwater 73/4-101h ft <br /> Groundwater Flow and Gradient Northeast-northwest @ 0 003 ft/ft <br />