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Date June 30, 1998 <br /> Quarter 1Q98 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamin Holt Dr, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 7G600-019-01 <br /> Pnmary Agency/Regulatory ID No RWQCB <br /> WORK PERFORMED THIS QUARTER (First Quarter- 1998) <br /> 1 Performed first quarter groundwater monitoring event <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter- 1998) <br /> 1 Prepare and submit first quarter 1998 groundiraier monitoring report <br /> 2 Perform second quarter 1998 groundwater monitoring event <br /> 3 Repair and restart air spargrng blower Perform O&M on air sparge system <br /> QUARTERLY RESULTS SUMMARY <br /> . Current Phase of Project Remedialion (Assmnt, Remed, etc) <br /> Frequency of Groundwater Sampling _F.-2, E-8 through E-1.2,PR-1, BDH-l. (Quarterly, etc) <br /> MW-4 MW-5 uarterl <br /> E-3 through E-7 PR-2 BDH-2 <br /> MW-1 MW-2 MW-3 1"and <br /> 3rd ctuarler) <br /> Frequency of Groundwater Monitoring QuarterIv (Monthly, etc) <br /> Is Free Product(FP)Present On-Site No (Yes/No) <br /> Cumulative FP Recovered to Date 624 (gallons) <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/AS/FP removal) <br /> TPH-g removed by SUET this quarter 0 (pounds) <br /> Cumulative TPH-g removed by SUET 4,815.__. (pounds) <br /> Approximate Depth to Groundwater 3 92 to 6 03 (Measure Feet) <br /> Groundwater Gradient Radial (Direction) <br /> 0 005 (Magnitude) <br /> DISCUSSION <br /> TPH-g was detected in five of the twenty wells sampled this quarter with a maximum concentration of 7,300 ppb <br /> . in well E-IO Benzene was detected in five wells at maximum concentration 2,000 ppb in â–ºyell E-10 MtBE was <br /> detected in six wells a maximum concentration of 32,000 ppb in well E-10 Groundwater elevations across the <br /> site increased by an average of 6 23 foot this quarter and (lie groundwater flow was radial Histoncally, the <br /> groundwater flow has been reported to be to the norlheast <br />