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Date May 19,2003 Quarter: F" 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 Count SJC Assembly Bill 681 Status Property owned by Atlantic Richfield Company WORK PERFORMED THIS QUARTER (First 2003): 1 Performed quarterly groundwater monitoring and sampling 2 Prepared and subnutted quarterly groundwater monitoring report 3 Restarted and performed operation and maintenance on AS systems WORK PROPOSED FOR NEXT QUARTER (Second 2003): 1 Perform quarterly groundwater monitoring and sampling 2 Prepare and submit quarterly groundwater monitoring report . QUARTERLY RESULTS SUMMARY (First 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 3`d 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 Current Remediation Techniques Air Sparging (SVE system currently off) TPHG removed by SVE this Quarter None Cumulative TPHG Removed 3,616 6 lbs Approximate Depth to Groundwater 8 75 to12 92 ft Groundwater Flow and Gradient Northeast @ 0 003 to 0 004 ft/ft 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 1WprocessVS 9P ARC(MD93�QuanerlyV QTR 03 2093 GWMR IQ03 do Page 1