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` Date June 1, 2004 Quarter 2"d Quarter, 2004 s ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 760 Address 225 South Cherokee Lane, Lodi, CA ARCO Environmental Engineer _Paul Supple _ Consulting Co/Contact Person URS/Vernon Elarth Consultant Project No 38466403 OL058 Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department Assembly Bill 681 Status Property Owned by Gurpreet Dhatt and Kuldeep Dhatt WORK PERFORMED THIS QUARTER (Second 2004): t 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 subnut quarterly groundwater monitoring report 3 Prepare site assessment report QUARTERLY RESULTS SUMMARY (Second 2004) Current Phase of Project Monitoring/Assessment Frequency of Groundwater Sampling MW-1 through MW-3 sampled quarterly Frequency of Groundwater Monitoring Quarterly Is Free Product(FP) Present Onsite No FP Recovered this Quarter None Cumulative FP Recovered to Date None Current Remediation Techniques None Approximate Depth to Groundwater 58 71 —59 69 feet below ground surface Groundwater Flow and Gradient Southwest @ 0 004 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\Wpwce US HP ARCO\00760\Quancrl3\2 QTR 04\760 GWMR 2Q04 doc Page 1