Laserfiche WebLink
r , <br /> Date March 8, 1999 <br /> Quarter 4Q98 <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 Joa urn County Environmental Health <br /> WORK PERFORMED THIS QUARTER (Fourth Quarter- 1998): <br /> 1 Performed fourth quarter groundwater monitoring event <br /> 2 Submitted third quarter 1998 groundwater monitoring report <br /> 3 Performed operation and maintenance on SVE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (First Quarter— 1999): <br /> 1 Prepare and subnut fourth quarter 1998 groundwater monitoring report <br /> 2 Perform first quarter 1999 groundwater monntonng event <br /> 3 Perform operation and maintenance on SVE/AS systems <br /> QUARTERLY RESULTS SUMMARY <br /> Current Phase of Project Remediation and Monitoring <br /> Frequency of Groundwater Sampling Wells ART-2 ATR-4 ATR-5 ATR-7 ATR-8 ATR-12 <br /> Ouarterly Wells ATR-1 ATR-3 ATR-6 ATR-9 ATR-10 ATR-h I <br /> = 1s`and 3`d guarters <br /> Frequency of Groundwater Morutonng Ouarterly <br /> Is Free Product(FP)Present On-Site No <br /> FP Recovered this Quarter None <br /> Cumulative FP Recovered to Date <1 <br /> Current Remediation Techniques SVES/AS <br /> TPH-g removed by SUES this quarter 179 5 Ibs <br /> Cumulative TPH-g removed 3J34 7 lbs <br /> Approximate Depth to Groundwater 8 86 to 13 02 <br /> Groundwater Gradient Northeast A 0 003 <br /> DISCUSSION: <br /> TPH-g was detected in two of six wells(ATR-5 and ATR-8)sampled this quarter at concentrations of 134 ppb <br /> and 456 ppb, respectively Benzene was detected in one of six wells(ATR-8)at a concentration of 10 2 ppb <br /> MtBE was reported in one well at a concentration of 8 98 ppb(ATR-5) Groundwater elevations across the site <br /> increased by an average of 0 14 feet this quarter Consistent with historical data, the groundwater flow was to the <br /> northeast Attachment A contains SVE/AS system operational data <br />