Laserfiche WebLink
i <br /> Date July 24,2002 <br /> Quarter tad Quarter,2002 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 02093 <br /> Address 3425 Tracy Blvd_, Tracy, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URS/Vernon Elarth <br /> Consultant Project No J5-00002093 01 00436 <br /> Primary Agency/Regulatory ID No San Joaquin County Public Heath Services SJCPHS <br /> Assembly Bill 681 Status Prop"owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Second 2002): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Performed operation and maintenance on soil vapor extraction/air sparge(SVE/AS)systems <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2002): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Perform operation and maintenance on SVE/AS systems <br /> • QUARTERLY RESULTS SUMMARY (Second 2002): <br /> Current Phase of Project Mornrntorin /Remediation <br /> Frequency of Groundwater Sampling ATR-2, ATR-4, ATR-5, ATR-7, ATR-8, and ATR-12 <br /> sampled quarterly,ATR-1, ATR-3, ATR-6, ATR-9, ATR-10, <br /> and ATR-11 sampled 1 st and Tdquarters only <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 gallon <br /> Current Remediation Techniques SVE/AS SVE system current) off <br /> TPHG removed by SVE this Quarter None <br /> Cumulative TPHG Removed 3,616 6 ibs <br /> Approximate Depth to Groundwater 91 — 12 6 ft <br /> Groundwater Flow and Gradient Northeast cG@ 0 009 ft/ft <br /> ANALYTICAL DATA REVIEW: <br /> Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, <br /> LCS/LCSD results, MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the <br /> laboratory <br /> DISCUSSION: <br /> Total petroleum hydrocarbons as gasoline (TPHG) were detected in three of the six wells sampled this quarter at <br /> concentrations ranging from 67 ppb (ATR-6) to 260 ppb (ATR-8) Benzene was reported in one of the five wells <br /> %\SACDATA31WpmcessV5 SP ARCOW0431Quanerly52 QTR 021GWMR doc Page 1 <br />