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it <br /> t <br /> Date September 24, 1998 <br /> Quarter 2Q98 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2093 Address 3425 Tracy Boulevard, Tracy, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consultiag Co/Contact Person SECOR Intemational Incorporated/Rusty Benkoslcy <br /> Consultant Project No 7G600-026-01 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> WORK PERFORMED THIS QUARTER (Second Quai ter- 1998) <br /> 1 Performed second quarter groundwater monitoring event <br /> 2 Restarted SVE/AS remediation systems <br /> WORK PROPOSED FOR NEXT QUARTER (Thai d Quai ter- 1998): <br /> I Prepare and submit second quarter 1998 groundwater monitoring report <br /> 2 Perform third quarter 1998 groundwater monitoring event <br /> 3 Perform operation and maintenance on SVE/AS systems <br />• QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation (Assmnt,Reined,etc) <br /> Frequency of Groundwater Sampling Wells ART-2,ATR4, ATR-5 ATR-7 (Quarterly etc} <br /> ATR-8 ATR-12 SMW-1 =quarterl <br /> Wells ATR-1,ATR-3 <br /> ATR-6,ATR-9,ATR-10,ATR-11 <br /> = Isc and 3rd quarters <br /> Frequency of Groundwater Monitoring Quarterly (Monthly,etc) <br /> Is Free Product(FP)Present On-Site No (Yes/No) <br /> FP Recovered this Quarter None (gallons) <br /> Cumulative FP Recovered to Date <1 (gallons) <br /> Current Remediation Techniques SVES/AS (SUES/AS/FP Removal) <br /> TPH-g removed by SVES this quarter 2068 (pounds) <br /> Cumulative TPH-g removed 2 955 (pounds) <br /> Approximate Depth to Groundwater 9 35 to 13 56 (Measure Feet) <br /> Groundwater Gradient Northwest (Direction) <br /> 0 001 (Magnitude) <br /> DISCUSSION: <br /> Consistent with historical data, TPH-g was detected in three of the seven wells sampled this quarter <br /> ranging in concentrations from 65 8(Well ATR-4) to 876 ppb (Well ATR-8) Benzene was reported <br /> in one well at a concentration of 30 0 ppb (Well ATR-8) MtBE was reported in three of the seven <br /> wells sampled at a maximum concentration of 109 ppb (Well ATR-2) Groundwater elevations across <br /> the site decreased by an average of 0 64 feet this quarter and the gioundwater flow was to the <br /> northwest Historically, the groundwater flow has been to the northeast <br />