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yl Date July 29,2003 Quarter. 2nd Quarter,2003 • ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 02093 Address 3425 Tracy Blvd , Tracy, California ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person URS/Vernon Elarth Consultant Project No 38466080 00336 Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department (SJCEHD) Assembly Bill 681 Status Property owned by Atlantic Richfield Company WORK PERFORMED THIS QUARTER (Second 2003): 1 Performed quarterly groundwater monitoring and sampling 2 Prepared and subnutted quarterly groundwater monitoring report 3 Performed operation and maintenance on AS system's 4 Subnutted work plan for vertical flow assessment WORK PROPOSED FOR NEXT QUARTER (Third 2003): 1 Perform quarterly groundwater monitoring and sampling . 2 Prepare and submit quarterly groundwater monitoring report 3 Implement work plan for vertical flow assessment QUARTERLY RESULTS SUMMARY (Second 2003): Current Phase of Project Monitoring/Remediation Frequency of Groundwater Sampling ATR-2, ATR-4, ATR-5, ATR-7,ATR-8, and ATR-12 sampled quarterly, ATR-1,ATR-3, ATR-6, ATR-9, ATR-10, and ATR-11 sampled 1 s`and Td quarters only Frequency of Groundwater Monitoring Quarterly Is Free Product (FP) Present on Site No FP Recovered this Quarter None Cumulative FP Recovered to Date _ <1 gallon Current Remediation Techniques _ Air Surging (SVE system currently off) TPHG removed by SVE this Quarter None Cumulative TPHG Removed 3,616 6 lbs Approximate Depth to Groundwater 8 81 toll 52 ft Groundwater Flow and Gradient Variable at 0 02 fVft ANALYTICAL DATA REVIEW- Based on the review of the analytical and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, LCS/LCSD results, MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory • K MPmcess\15 BP ARC0+020931Quxnerlyl2 QTR 0312093 GWMR 2Q03 do. Page 1