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[� 1 <br /> Date March 7,2002 i <br /> Quarter 4Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2093 Address 3425 Tracy Blvd,Tracy,CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR/Rusty Benkosky <br /> Consultant Project No 077 43210 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 subirutted quarterly groundwater monitoring report <br /> 3 Performed operation and maintenance on soil vapor extraction/air sparge(SVE/AS) systems <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 Perform operation and maintenance on S VEIAS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Morutonng/Remediation <br /> Frequency of Groundwater Sampling ATR-2,ATR-4,ATR-5,ATR-7,ATR-8,and ATR-12 sampled <br /> quarterly,ATR-1,ATR-3,ATR-6,ATR-9,ATR-10,and <br /> ATR-11 sampled I"and 3'a quarters only <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present Onsite No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <1 gallon <br /> Current Remediation Techniques SVE/AS <br /> TPHg removed by S VE this quarter None <br /> Cumulative TPHg removed 3,616 6 lbs <br /> Approximate Depth to Groundwater 83/4-12V2 ft <br /> Groundwater Flow and Gradient Northeast @ 0 002 ft/ft <br /> • <br />