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Date: March 23,2005 Quarter 1s1 Quarter,2005 • ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 02093 Address 3425 Tracy Blvd , Tracy, Cahfomia ARCO Environmental Engineer Paul Supple- Consulting u leConsulting Co/Contact Person URS/Vernon Elarth Consultant Project No 38466457 OA 143 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 (First 2005): 1 Performed quarterly groundwater monitoring and sampling 2 Prepared and submitted quarterly groundwater monitoring report WORK PROPOSED FOR NEXT QUARTER (Second 2005): 1 Perform quarterly groundwater monitoring and sampling 2 Prepare and subrmt quarterly groundwater monitoring report QUARTERLY RESULTS SUMMARY (First 2005): . Current Phase of Project Monitoring Frequency of Groundwater Sampling ATR-5 and ATR-8 sampled Quarterly ATR-1 through ATR-4, ATR-6, ATR-7, and ATR-9 through ATR-12 sampled Annually 1st Quarter Frequency of Groundwater Monitoring Quarter) Is Free Product (FP) Present on Site No FP Recovered this Quarter None Cumulative FP Recovered to Date <1 gallon Current Remediation Techniques Natural Attenuation TPHG removed by SVE this Quarter None Cumulative TPHG Removed 3,616 6 lbs Approximate Depth to Groundwater 8 47 to 12 73 feet below ground surface b s Groundwater Flow and Gradient East—Northeast at 0 003 -0 007 feet/foot ft/ft ANALYTICAL DATA REVIEW: Based on the review of the electronic 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 tiW PrcccOV5 BP ARCOW20935Qua"e 1y\2005\2093 CWMR 1Q05 dor Page 1