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*0 <br /> Date July 24,2001 <br /> . Quarter 2Q2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2093 Address 3425 Tracy Blvd ,Tracy,CA <br /> ARCO Environmental Engineer _Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 077 43210 802 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> Assembly Bill 681 Status Pro owned by Atlantic Richfield Company(ARCO) <br /> WORK PERFORMED THIS QUARTER (Second Quarter—2001): <br /> 1 Performed quarterly groundwater monitoring <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter—2001): <br /> 1 Perform quarterly groundwater monitoring <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> • 3 Perform operation and maintenance on SVE/AS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Protect Monitoring/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 3d quarters only <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present On-Site 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 SVE this quarter 2 4 lbs <br /> Cumulative TPHg removed 3,616 6 lbs <br /> Approximate Depth to Groundwater 9 to 13 ft <br /> Groundwater Gradient Variable @ 0 002—0 006 <br /> • <br />