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Date December 11, 1998 <br /> Quarter 3Q98 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Ben amen 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 (Third Quarter- 1998): <br /> 1 Prepared and submitted second quarter 1998 groundwater monitoring report <br /> 2 Performed third quarter groundwater monitoring event <br /> 3 Performed operation and maintenance on remediation system <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter - 1998): <br /> 1 Perform fourth quarter 1998 groundwater monitoring event <br /> 2 Perform operation and maintenance on remediation system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation (Assmnt, Reined, etc) <br /> Frequency of Groundwater Sampling E-2 E-8 throe h E-12 PR-1.BDH-1 (Quarterly, etc) <br /> MW4MW-5 uarterl <br /> E-3 through E-7 PR-2 BDH-2 <br /> MW-I. MW-2 MW-3 1"and 3'duarter <br /> Frequency of Groundwater Monitoring Ouarterly (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 32,000,000 (gallons) <br /> Current Remediation Techniques SVE/AS SVE down due to high G (SVE/AS/FP) <br /> TPH-g removed by SUET this quarter 0 (pounds) <br /> Cumulative TPH-g removed by SUES 4,815 (pounds) <br /> Approximate Depth to Groundwater 7 57 to 10 30 (Measure Feet) <br /> Groundwater Gradient Radial (DirecUon) <br /> 0 006 to 0 022 (Magnitude) <br /> DISCUSSION: <br /> TPH-g and benzene were detected in six of the twenty wells sampled this quarter with maximum <br /> concentrations of 1,440 ppb (well E-3) and 14 6 ppb (well E-10), respectively MtBE was <br /> 1 detected in four wells with concentrations ranging from 6 51 ppb (well E-3) to 1,870 ppb in <br /> (well E-10) Groundwater elevations across the site decreased by an average of 1 76 feet this <br /> quarter Groundwater flow was radial, consistent with the first and second quarter 1998 <br />