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ri <br /> r <br /> Date December 11, 1998 <br />• Quarter 3Q98 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2093 Address 3425 Tracy Boulevard, Tracy, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 7G600-026-01 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> WORK PERFORMED THIS QUARTER (Third Quarter- 1998)- <br /> 1 Performed third quarter groundwater monitoring event <br /> 2 Submitted second quarter 1998 groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter- 1998): <br /> 1 Prepare and submit third quarter 1998 groundwater monitoring report <br /> 2 Perform fourth quarter 1998 groundwater monitoring event <br /> 3 Perform operation and maintenance on S VE/AS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation-SVE/AS (Assnuit,Remed,etc) <br /> Frequency of Groundwater Sampling Wells ART-2 ATR-4 ATR-5 ATA-7 (Quarterly,etc) <br /> ATR-8 ATR-12 SMW-1 =guarterly <br /> Wells ATR-1,ATR-3, <br /> ATR-6 ATR-9 ATR-10 ATR- <br /> = I"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 <I (gallons) <br /> Current Remediation Techniques SVES/AS (SVES/AS/FP Removal) <br /> TPH-g removed by SUES this quarter 0 (pounds) <br /> Cumulative TPH-g removed 3J27 (pounds) <br /> Approximate Depth to Groundwater 9 40 to 13 20 (Measure Feet) <br /> Groundwater Gradient Northeast (Direction) <br /> 0 003 (Magnitude) <br /> DISCUSSION: <br /> TPH-g and benzene were detected in one (ATR-3)of eleven wells sampled this quarter at <br /> concentrations of 1,100 ppb and 6 1 ppb, respectively MtBE was reported in three of eleven wells <br /> sampled at a maximum concentration of 290 ppb (SMW-1) Groundwater elevations changes across <br /> the site varied from decreasing by 0 14 feet(ATR-9) to increasing by 0 52 feet(ATR-1 l) this quarter <br /> Consistent with historical data, the groundwater flow was to the northeast <br />