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r •1 <br /> . Date February 29,2000 <br /> Quarter 4Q99 <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 006 <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 (Fourth Quarter- 1999): <br /> 1 Conducted quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater report <br /> 3 Performed operation and maintenance on remediation system <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter—2000): <br /> 1 Conducted quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater report <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 through 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 (1'`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 Munds <br /> Cumulative TPH-g removed by GWETS 3,980 pounds <br /> Total groundwater extracted 32,000,000 allons <br /> Current Remediation Techniques SVE/AS SVE down due to high GW <br /> TPH-g removed by SUET this quarter 0 <br /> Cumulative TPH-g removed by S VES 4,815 pounds <br /> Approximate Depth to Groundwater 9 02 toll 82 <br /> Groundwater Gradient Variable <br /> DISCUSSION: <br /> TPH-g was detected in two of the rune wells sampled this quarter at concentrations of 186 ppb(MW-5) to 10,800 <br /> ppb(E-10) Benzene was reported in two wells at a maximum concentration of 2,290 ppb(E-10) MtBE was <br /> detected in three wells at concentrations ranging from 2 59 ppb(E-2)to 17,800 ppb(E-10) Groundwater <br /> elevations across the site decreased by an average of 0 2 feet this quarter No predominant groundwater flow <br /> direction existed at the site Well BHD-1 was inaccessible due to construction activities on the north side of <br /> Benjamin Holt Avenue Attachment A contains SVE/AS system operational data <br />