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Date December 10, 1999 <br /> Quarter 3Q99 <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 077 41728 006 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> Assembly Bill 681 Statuts Property Owned by ARCO Products Company <br /> WORK PERFORMED THIS QUARTER (Third Quarter— 1999): <br /> 1 Performed third quarter groundwater monitoring event <br /> 2 Submitted second quarter 1999 groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter— 1999): <br /> 1 Prepare and submit thud quarter 1999 groundwater monitoring report <br /> • 2 Perform fourth quarter 1999 groundwater monitoring event. <br /> 3 Perform operation and maintenance on SVE/AS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitonng/Remediatton _ <br /> Frequency of Groundwater Sampling Wells ART-2.ATR-4, ATR-5. ATR-7.ATR-8. and ATR-12 <br /> Quarterly�Wells ATR-1, ATR-3.ATR-6, ATR-9. ATR-10 and <br /> ATR-I 1 = IStand 3rd guarters <br /> Frequency of Groundwater Monitoring QMgerly <br /> Is Free Product(FP)Present On-Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <1 gaflon <br /> Current Remediation Techniques SVES/AS <br /> TPH-g removed by SUES this quarter 82 66 lbs <br /> Cumulative TPH-g removed 3,430 0 Ibs <br /> Approximate Depth to Groundwater 9 17 to 13 36 <br /> Groundwater Gradient East-northeast _0 004 - <br /> DISCUSSION: <br /> TPH-g was detected in two of twelve wells sampled this quarter at concentrations of 747 ppb(ATR-8)and 2,800 <br /> ppb(ATR-3) Benzene was detected in two of twelve wells at concentrations of 17 5 ppb(ATR-3)and 27 8 ppb <br /> (ATR-8) MtBE was reported in two wells at concentrations of 52 3 ppb(ATR-3) and 5 12 ppb(ATR-5) <br /> Groundwater elevations across the site decreased by an average of 0 18 feet this quarter with the exception of well <br /> ATR-8 where the groundwater increased by 0 36 feet Consistent with historical data, the groundwater flow was <br /> to the northeast Attachment A contains SVE/AS system operational data <br />