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Date July 23,2004 � Quarter 2nd Quarter,2004 QUARTERLY GROUNDWATER MONITORING REPORT Facility No 11191 Address 1469 West Hammer Lane, Stockton, CA ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person URS/Vernon Elarth Consultant Project No 38466550 OL058 Primary Agency/Regulatory ID No Harlin Knoll San Joaquin County Environmental Health Department Assembly Bill 681 Status Property owned by Conoco Phillips WORK PERFORMED THIS QUARTER (Second 2004): 1 Performed quarterly groundwater monitoring and sampling 2 Prepared and submitted quarterly groundwater monitoring report WORK PROPOSED FOR NEXT QUARTER (Third 2004): 1 Perform quarterly groundwater monitoring and sampling 2 Prepare and submit quarterly groundwater monitoring report I QUARTERLY RESULTS SUMMARY (Second 2004): Current Phase of Project Monitoring Frequency of Groundwater Sampling MW-1 through MW-7, Quarterly _ Frequency of Groundwater Monitoring Quarterly Is Free Product (1"P) Present on Site No FP Recovered This Quarter NA Cumulative FP Recovered to Date NA Approximate Depth to Groundwater 49 56 to 51 56 feet below ground surface (bgs) Direction of Groundwater Flow Northeast to South Groundwater Gradient 0 002 to 0 005 feet/toot (ft/ft) _ ANALYTICAL DATA REVIEW: Please note that as of April 1, 2004, the laboratory has changed the carbon range for gasoline range organics (GRO) from C6 — C10 to C4 — C12 (to include the oxygenates) The resulting data may be impacted by the potential inclusion of additional total petroleum hydrocarbons as gasoline (TPHg) and non-TPHg analytes within the revised carbon range, which may result in a higher reported concentration Where the resulting GRO concentration is based on a single analyte(i e ,a non-TPHg analyte or a single TPHg analyte),the analyte will be identified if possible K lWpr ss\J5 BP ARC011119]1Quarterlyl2 QTR 04111191 GWMR 2Q04 doe Page 1