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Date July 30,2004 <br /> Quarter- 2"d Quarter,2004 <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 38466457 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department SJCEHD <br /> Assembly Bill 681 Status Property owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Second 2004): <br /> 1 Performed quarterly groundwater monitoring and sampling <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Shut down AS systems <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2004): <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> 2 Prepare and submit quarterly groundwater monitoring report <br /> QUARTERLY RESULTS SUMMARY (Second 2004): <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling ATR-5 and ATR-8 sampled Quarterly <br /> ATR-1 through ATR-4, ATR-6, ATR-7, and ATR-9 through <br /> ATR-12 sampled Annually 151 quarter <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 Natural Attenuation <br /> TPHG removed by SVE this Quarter None <br /> Cumulative TPHG Removed 3,616 6 lbs <br /> Approximate Depth to Groundwater8 92 to13 05 feet below ground surface (ft bgs) <br /> Groundwater Flow and Gradient , North-Northeast at 0 006 feet/foot (ft/ft) <br /> ANALYTICAL DATA REVIEW: <br /> Please note that as of April 1, 2004,the laboratory has changed the carbon range for gasoline range organics (GRO) <br /> from C6 — C10 to C4 — C12 (to include the oxygenates) The resulting data may be impacted by the potential <br /> inclusion of additional total petroleum hydrocarbons as gasoline (TPHg) and non-TPHg analytes within the revised <br /> carbon range, which may result in a higher reported concentration Where the resulting GRO concentration is based <br /> on a single analyte(►e ,a non-TPHg analyte or a single TPHg analyte),the analyte will be identified if possible <br /> Based on the review of the electronic 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 /> K Mpl esA5 BP ARC01020931Quarterlyl2 QTR 0412093 G WMR 2Q04 do Page 1 <br />