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Date August 2,2004 <br /> Quarter 2°3 Quarter,2004 <br /> • ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 4493 <br /> Address 205 N Center St , Stockton, CA <br /> Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466465 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> SJCEHD <br /> Assembly Bill 681 Status Property owned by City of Stockton <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 Installed additional downgradient well nest <br /> WORK PROPOSED FOR NEXT QUARTER (Third 2004): <br /> 1 Conduct 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/Assessment <br /> Frequency of Groundwater Sampling MW-1 through MW-12D sampled quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present Onsite No <br /> Current Remediation Techniques Natural attenuation <br /> Approximate Depth to Groundwater 13 34 to 25 38 feet below ground surface (bgs) <br /> Groundwater Flow and Gradient Northeast C 0 01 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 — CIO 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(i 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%WP+0cessV5 SP ARCOkO4493%Q.a t—lyi2 QTR 0714443 GWMR 2Q04 do Page 1 <br />