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Date February 22 2001 <br /> Quarter 4Q00 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamin Holt Drive,Stockton,CA , <br /> ARCO Environmental Engineer Paul Supple r� <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky Nl. <br /> Consultant Project No 077 41930 804 <br /> Primary Agency/Regulatory 1D No San Joaquin County Environmental Health �} <br /> Assembly Bill 681 Status Property Owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Fourth Quarter— 2000): <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 maintaine AS system <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter—2001): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater report <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 3d quarter) <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 4 5 pounds <br /> Approximate Depth to Groundwater 8 i/4 to 1.0'/2 feet <br /> Groundwater Gradient Northeast at 0 002 ft/ft <br /> DISCUSSION: <br /> TPHg was detected in four of the ten wells sampled this quarter at concentrations ranging from 52 0 ppb (E-2) to <br /> 18,200 ppb(E-10) Benzene was reported in three of the ten wells sampled at concentrations ranging from 0 741 <br /> ppb(E-8) to 1,440 ppb(E-t0) MtBE was detected in four of the ten wells at concentrations ranging from 2 67 ppb <br /> (E-8)to 10,700 ppb(E-10) Groundwater elevations across the site increased by an average of 0 53 feet this <br />