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Date September 23, 1999 <br /> Quarter 2Q99 <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 41727 005 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> Assembly Bill 681 Status Property Owned by ARCO Products Company <br /> WORK PERFORMED THIS QUARTER (Second Quarter- 1999): <br /> 1 Prepared and submitted first quarter 1999 groundwater motutornng report <br /> 2 Performed second quarter groundwater monitoring event <br /> 3 Performed operation and maintenance on remediation system <br /> 4 Submitted letter for well sampling reduction to SJCDEH <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter— 1999): <br /> 1 Prepare and submit second quarter 1999 groundwater monitoring report <br /> 2 Perform third quarter 1999 groundwater monitoring event <br /> 3 Perform operation and maintenance on remediation system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation and Monitoring <br /> Frequency of Groundwater Sampling E-2 E-8 throw h E-12 PR-1 BDH-1 MW-4 MW-5 <br /> (quarterly).E-3 through E-7.PR-2 BDH-2, <br /> MW 1,MW-2.MW-3 ' and 3`dquarter) <br /> Frequency of Groundwater Momtonng QMarterly <br /> Is Free Product(FP)Present On-Site No <br /> Cumulative FP Recovered to Date 642 pounds <br /> Cumulative TPH-g removed by GWETS 3,980 pounds <br /> Total groundwater extracted 32,000,000 gallons <br /> Current Remediation Techniques SVE/AS(SVE down due to high GW) <br /> TPH-g removed by SVET this quarter 0 <br /> Cumulative TPH-g removed by SUES 4,915 vounds <br /> Approximate Depth to Groundwater 7 38 to 10 19 <br /> Groundwater Gradient Radial a.0 0009 ft/ft <br /> DISCUSSION: <br /> TPH-g was detected in two of the nine wells sampled this quarter at concentrations of 160 ppb(E-10)and 162 <br /> ppb(BHD-1) Benzene was reported to two wells at a maximum concentration of 7 07 ppb(E-10) MtBE was <br /> detected in two wells at concentrations of 89 3 ppb(E-10)and 728 ppb(BHD-1) Groundwater elevations across <br /> the site decreased by an average of 198 feet this quarter Groundwater flow was primarily to north-nortwest <br /> generally consistent with historical data Well MW-5 was inaccessible due to constructions activities associated <br />