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f <br /> Date May 27, 1999 <br /> Quarter I Q99 <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 Protect No 7G600-019-03 <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- 1999): <br /> 1 Prepared and submitted fourth quarter 1998 groundwater monitoring report <br /> 2 Performed first quarter groundwater monitoring event <br /> 3 Performed operation and maintenance on remediation system <br /> 4 Collected compliance samples during UST and product line replacement activities <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter- 1999)- <br /> 1 Prepare and submit first quarter 1999 groundwater monitoring report <br /> . 2 Perform second quarter 1999 groundwater monitoring event <br /> 3 Perform operation and maintenance on remediation system <br /> 4 Prepare and submitt UST and product line removal report <br /> 5 Submitt letter for well sampling reduction to SJCDEH <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Pr41ect 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, SDH-2, <br /> MW-1 MW-2 MW-3 In and 3'quarter) <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present On-Site No <br /> Cumulative FP Recovered to Date 642 <br /> Cumulative TPH-g removed by GWETS 3,980 <br /> Total groundwater extracted 32,000,000 <br /> Current Remediation Techniques SVE/AS SVE down due to high GW <br /> TAH-g removed by SVET this quarter 0 <br /> Cumulative TPH-g removed by SVES 4,815 - <br /> Approximate Depth to Groundwater 2 3 to 8 2 <br /> Groundwater Gradient Radial @ 0 0007 ft/ft <br /> DISCUSSION: <br /> TPH-g was detected in three of the twenty-one wells sampled this quarter at concentrations ranging from 432 ppb <br /> (BHD-1)to 1,620 ppb(E-10) Benzene was reported in four wells at concentrations ranging from 0 555 ppb <br /> (MW-3)to 235 ppb(E-10) MtBE was detected in two wells at concentrations of 263 ppb(BHD-1)and 3,980 ppb <br />