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I <br /> �F •Y <br /> Date July 6 2000 <br /> Quarter tQ00 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamin Holt Dave Stockton CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/ Rusty Benkosky <br /> Consultant Project No 077 41930 8th I <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 (First Quarter— 2000)- <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 (Second 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 Wl and 3`d guarter) <br /> Frequency of Groundwater Monitoring Ouarterly _ <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 pounds—System restarted March 15, 2000 <br /> Cumulative TPHg removed by SVES 4 815 pounds <br /> Approximate Depth to Groundwater 4 33 to 7 10 <br /> Groundwater Gradient Northeast at 0 002 R/ft <br /> DISCUSSION <br /> TPHg was detected in five of the twenty wells sampled this quarter at concentrations of 55 9 ppb(BI-iD-t) to <br /> 1,520 ppb(E-10) Benzene was reported in three weils ata maxmuun concentration of 161 ppb(E-10) MtBE <br /> was detected in two wells at concentrations of 3 310 ppb(E-10) and 15 8 ppb (E-8) Groundwater elevations <br /> across the site increased by an average of 4 44 fect this quarter The groundwater flow direction was primarily <br /> toward the northeast at a gradient of 0 002 ft/ft The SVE Svstem was restarted on March 15, 2000 after being <br /> shutdown due to high groundwater levels Attachment A contains SVE/AS system operational data <br />