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Date July 6 2000 <br /> Quarter IQ2000 <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 Stattits Property Owned by ARCO Products Company <br /> WORK PERFORMED THIS QUARTER (Fn st Quai tel — 2000) <br /> 1 Performed quarterly groundwater monitoring event <br /> 2 Submitted quarterly groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quaff tei — 2000): <br /> 1 Prepare and subinit quarterly groundwater monitoring report <br /> 2 Perforin quarterly groundwater monitoring event <br /> 3 Perforin operation and ma litenalice on SVE/AS systems <br /> 4 Continue to pulse SVE/AS system <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Monrtonn emediation <br /> Frequency of Groundwater Sampling Wells ATR-2 6TR-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 = 1"and 3r4 guatiers <br /> Frequency of Groundwater Monitonng Quarterly <br /> Is Free Product (FP)Present On-Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <l gallon <br /> Current Remediation Techniques SUES/AS <br /> TPHg removed by SVES this quarter 14 09 lbs <br /> Cumulative TPHg removed 1,498 3 lbs <br /> Approximate Depth to Groundwater 8 18 to 12 45 <br /> Groundwater Gradient Northeast (@rt 0 003 ft/ft <br /> DISCUSSION. <br /> TPHg was detected in three of twelve wells sainpled this quarter ata nia\iinum concentration of 405 ppb (ATR- <br /> 3) Benzene was reported in two NNells Iles quarter at a maminuin concentration of 2 35 ppb(ATR-3) MtBE was <br /> reported in four wells at concentrations ranging from 3 06 ppb (ATR-5) to 2,160 ppb(ATR-3) Groundwater <br /> elevations across the site increased by an average of 0 53 feet this quarter Consistent Nvith historical data, the <br /> groundwater flow was to the northeast Attachment A contains SVE/AS system operational data <br />