Laserfiche WebLink
. Date May 27, 1999 <br /> Quarter 1Q99 <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 Inco rated/Rusty Benkosky <br /> Consultant Project No 7G600-026-02 <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 (First Quarter- 1999): <br /> I Performed first quarter groundwater monitoring event <br /> 2 Subnutted fourth quarter 1998 groundwater monitoring report <br /> 3 Performed operation and maintenance on S VE/AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Second Quarter— 1999): <br /> 1 Prepare and subtiut first quarter 1999 groundwater monitoring report <br /> 2 Perform second quarter 1999 groundwater momtonng 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 /> Quarterly Wells ATR-1 ATR-3 ATR-0 ATR-9 ATR-10 ATR-l1 <br /> = I"'and 3rd puarters _ <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 <br /> Current Remediation Techniques SVES/AS <br /> TPH-g removed by SVES this quarter 91 3 lbs <br /> Cumulative TPH-g removed 3,221 9 lbs „ <br /> Approximate Depth to Groundwater 8 55 to 12 79 <br /> Groundwater Gradient Northeast_�0 006 <br /> DISCUSSION: <br /> TPH-g was detected in three of twelve wells sampled this quarter at concentrations ranging from 75 6 ppb <br /> (ATR-5) to 652 ppb(ATR-3) Benzene was detected in three of twelve wells at concentrations ranging from <br /> 0 586 ppb(ATR-5)to 2 12 ppb(ATR-8) MtBE was reported in one well (ATR-3) at a concentration of 16 4 ppb <br /> Groundwater elevations across the site increased by an average of 0 146 feet this quarter Consistent with <br /> historical data, the groundwater flow was to the northeast Attachment A contains SVE/AS system operauorial <br /> data <br />