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Date September 23, 1999 <br /> Quarter 2Q99 <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 005 <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 (Second Quarter- 1999): <br /> 1 Performed second quarter groundwater momtonng event <br /> 2 Submitted first quarter 1999 groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Third Quarter— 1999): <br /> 1 Prepare and submit second quarter 1999 groundwater monitoring report <br /> 2 Perform third quarter 1999 groundwater monitoring event <br /> 3 Perform operation and maintenance on SVE/AS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Protect Remediation <br /> Frequency of Groundwater Sampling Wells ART-2 ATR4, 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-11 = 1"and P auarters <br /> Frequency of Groundwater Monitoring Ouarterly <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 S VES/AS <br /> TPH-g removed by SUES this quarter 125 4 lbs <br /> Cumulative TPH-g removed 3.347 4 lbs <br /> Approximate Depth to Groundwater 8 81 to 1306 <br /> Groundwater Gradient East-northeast _.0 009 _ <br /> DISCUSSION: <br /> TPH-g was detected in one of six wells sampled this quarter at a concentration of 155 ppb(ATR-8) Benzene was <br /> detected in two of six wells at a maximum concentration of 179 ppb(ATR-8) MtBE was reported in one well <br /> (ATR4)at a concentration of 8,720 ppb The MtBE concentration in well ATR4 tlus quarter represents the <br /> • tustoncal high in this well Groundwater elevations across the site decreased by an average of 0 14 feet thus <br /> quarter Consistent with lustoncal data, the groundwater flow was to the east-northeast Attachment A contains <br /> SVE/AS system operational data <br />