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Date September 25, 1998 <br /> . Quarter 2Q98 <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 7G600-019-01 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> WORK PERFORMED THIS QUARTER (Second Quarter- 1998)- <br /> 1 Performed second quarter groundwater monitoring event <br /> 2 Repaired and restarted air sparging blower Performed O&M on air sparge system <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter- 1998). <br /> 1 Prepare and submit second quarter 1998 groundwater monitoring report <br /> 2 Perforn-i third quarter 1998 groundwater monitoring event <br /> 3 Perform O&M on air sparge system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation (Assmnt, Remed ,etc) <br /> Frequency of Groundwater Sampling E-2, E-8 through E-12, PR-1,BDH-1,__ (Quarterly,etc) <br /> MW-4,MW-5 (quarterly), <br /> E-3 through E-7 PR-2 BDH-2 <br /> MW-1 MW-2 MW-3 I"and <br /> 3rd quarter) <br /> Frequency of Groundwater Monitoring Quarterly (Monthly, etc} <br /> Is Free Product(FP)Present On-Site No (Yes/No) <br /> Cumulative FP Recovered to Date 642 (gallons) <br /> Cumulative TPH-g removed by GWETS 3,980 (pounds) <br /> Total groundwater extracted 32,00-0000 (gallons) <br /> Current Remediation Techniques SVE/AS (SVE/AS/FP Removal) <br /> TPH-g removed by SVET this quarter 0 (pounds) <br /> Cumulative TPH-g removed by SVET 4,815 (pounds) <br /> Approximate Depth to Groundwater 5 91 to 8 66 (Measure Feet) <br /> Groundwater Gradient Radial (Direction) <br /> 0 008 to 0 011 (Magnitude) <br /> DISCUSSION <br /> TPH-g and benzene were detected in two of the eight wells sampled this quarter with maximum <br /> concentrations of 15,000 ppb (Well E-10) and 110 ppb (Well E-10), respectively MtBE was <br /> detected in three wells at a maximum concentration of 19,000 ppb in Well E-10 Groundwater <br /> elevations across the site decreased by an average of 1 96 feet this quarter, and the gioundwater <br />