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r * <br /> Date January 12, 2000 <br /> Quarter 4Q99 <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 007 <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 (Fourth Quarter— 1999)• <br /> 1 Performed fourth quarter groundwater monitoring event <br /> 2 Submitted third quarter 1999 groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter—2000): <br /> 1 Prepare and submit fourth quarter 1999 groundwater monitoring report <br /> 2 Perform first quarter 2000 groundwater monitoring event <br /> 3 Perform operation and maintenance on SVE/AS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monitoring/Remediation <br /> Frequency of Groundwater Sampling Wells ATR-2,ATR-4,ATR-5,ATR-7,ATR-8,and ATR-12=.. <br /> Ouarterly Wells ATR-1 ATR-3 ATR-6 ATR-9 ATR-10, and <br /> ATR-1 1 = I"and 3`d quarters <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present On-Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <1 gallon <br /> Current Remediation Techniques SVES/AS <br /> TPH-g removed by SVES this quarter 54 lbs <br /> Cumulative TPH-g removed 3,484 lbs <br /> Approximate Depth to Groundwater 7 99 to 13 19 <br /> Groundwater Gradient Northeast @ 0 01 to 0 04 ft/ft <br /> DISCUSSION: <br /> TPHg and MtBE were detected in one of six wells sampled this quarter at concentrations of 648 ppb(ATR-8)and <br /> 857 ppb(ATR-4), respectively Groundwater elevations across the site increased by an average of 0 11 feet this <br /> quarter with the exception of well ATR-8 where the groundwater decreased by 1 18 feet Consistent with <br />• historical data,the groundwater flow was to the northeast Attachment A contains SVE/AS system operational <br /> data <br />