Laserfiche WebLink
Date November 6, 2000 <br /> Quarter 3Q00 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2133 Address 2908 Benjamin Holt Dave,Stockton,CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No 077 41930 803 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health <br /> Assembly Bill 681 Status Property Owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Third Quarter—2000): <br /> 1 Conducted quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater report <br /> 3 Performed operation and maintenance on SVE/AS remediation system <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter—2000): <br /> 1 Conduct quarterly groundwater monitoring and sampling <br /> . 2 Prepare and submit quarterly groundwater report <br /> 3 Turn off SVE system due to low influent concentrations,continue to operate and maintains AS system <br /> QUARTERLY RESULTS SUNE%IARY <br /> Current Phase of Project V Remediation and Monitoring <br /> Frequency of Groundwater Sampling E-2,E-8 through E-12,PR-1,BDH-1,MW-4,MW-5 <br /> (quarterly),E-3 through E-7,PR-2,BDH-2, <br /> MW-1,MW-2,MW-3 (1"and 3rd quarter) <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product(FP)Present On-Site No -••_._.—, <br /> Cumulative FP Recovered to Date 642 pounds <br /> Cumulative TPHg removed by GWETS 3,980 r2unds <br /> Total groundwater extracted 32,000,000 gallons <br /> Current Remediation Techniques SVFJAS <br /> TPHg removed by SVE this quarter 65 4 pounds <br /> Cumulative TPHg removed by SVES 4,9013 pounds _ _ - <br /> MtBE Removed this Quarter 21 pounds <br /> Cumulative MtBE Removed 4 5 pounds <br /> Approximate Depth to Groundwater 8 5 to 11 5 ft <br /> Groundwater Gradient Northeast at 0 002 ft/ft <br /> DISCUSSION: <br /> TPHg was detected in four of the twenty wells sampled this quarter at concentrations ranging from 90 7 ppb(E-9) <br /> to 1,130 ppb(E-10) Benzene was reported in three of the twenty wells sampled at at concentrations ranging from <br /> 4 16 ppb(E-3) to 155 ppb (E-10) MtBE was detected in five wells at concentrations ranging from 2 86 ppb(E-2) <br />