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Date April 30, 2001 <br /> Quarter 1Q01 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamin Holt Drive,Stockton,CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 077 43235 801 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> Assembly Bill 681 Status Property Owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (First Quarter—2001): <br /> 1 Conducted quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater report <br /> 3 Turned off SVE system due to low influent concentrations,continued to operate and maintain AS system <br /> 4 Prepared and submitted letter requesting SJCEHD's concurrence with SECOR's deterrmnation that the <br /> hydrocarbon plumes at the ARCO facility located at 2908 Benjamin Holt Drive and the Chevron facility <br /> located at 2905 Benjamin Holt Drive are commingled <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter-2001): <br /> 1 Conduct quarterly groundwater monttoring and sampling <br /> 2 Prepare and submit quarterly groundwater report <br /> I <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation and Monitoring <br /> Frequency of Groundwater Sampling E-2,E-8 through E-12,PR-1,BDH-1,MW4,MW-5 <br /> (quarterly),E-3 through E-7,PR-2,BDH-2, <br /> MW-1,MW-2,MW-3(I"and 3'a quarters) <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present On-Site No <br /> Cumulative FP Recovered to Date 642 pounds <br /> Cumulative TPHg removed by GWETS 3,980 pounds <br /> Total groundwater extracted 32,000,000 gallons <br /> Current Remediation Techniques SVE/AS <br /> TPHg removed by SVE this quarter 0 0 pounds <br /> Cumulative TPHg removed by SVES 4,897 pounds <br /> MtBE Removed this Quarter 0 0 pounds <br /> Cumulative MtBE Removed 45 pounds <br /> Approximate Depth to Groundwater 6 to 8 Sh feet <br /> Groundwater Gradient Northeast @ 0 002 ft/ft <br />