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[y Date May 6,2004 Quarter- 1"Quarter,2004 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 2186 Address 3212 North California Street, Stockton, CA ARCO Environmental Engineer Paul Supple Consulting Co/Contact Person URSNernon Elarth Consultant Project No 38466462 OL058 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 2004): 1 Performed quarterly groundwater monitoring and sampling 2 Prepared and submitted quarterly groundwater monitoring report WORK PROPOSED FOR NEXT QUARTER (Second 2004)- 1 Perform quarterly groundwater monitoring and sampling 2 Prepare and submit quarterly groundwater monitoring report QUARTERLY RESULTS SUMMARY (First 2004): Current Phase of Project Monitoring/ Remedial_ Design Frequency of Groundwater Sampling MW-1 through MW-7, and VW-1A through VW-38 sampled quarterly Frequency of Groundwater Monitoring Quarter) Is Free Product(FP) Present on Site No FP Recovered this Quarter NA Cumulative FP Recovered to Date NA Current Remediation Techniques Natural aftenuation/SVE with airsparge to be installed Approximate Depth to Groundwater 45 12 to 47 17 feet below ground surface Groundwater Gradient Northwest @ 0 06 ft/ft ANALYTICAL DATA REVIEW: Please note that during 2003, the laboratory has changed Total Petroleum Hydrocarbons as Gasoline (TPHg) to Gasoline Range Organics (GRO) The resulting data may be �mpacte—d-by the potential mcfusion of non-TPHg analytes within th`e requested carbon range resulting in a higher concentration being reported 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 1WPrOcess\15 BP ARC01021861Quarterl}41 QTR 0412186 GWMR 1Q04 doc Page 1