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Date. August 3,2004 <br /> Quarter 2nd Quarter,2004 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2186 <br /> Address 3212 North California Street, Stockton, CA <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person URSNernon Elarth <br /> Consultant Project No 38466462 OL058 <br /> Primary Agency/Regulatory ID No San Joaquin County Environmental Health Department <br /> 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 The following well locations were unable to be <br /> sampled or monitored due to insufficient water VW-1A,VW-2A,VW-3A,and VW-4 i <br /> 2 Prepared and submitted quarterly groundwater monitoring report <br /> 3 Complete Installation of SVE system <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 /> 3 Start up SVE system <br /> 4 Prepare air sparge pilot test work plan <br /> QUARTERLY RESULTS SUMMARY (Second 2004): <br /> Current Phase of Project Monitoring I Remedial System Installation <br /> Frequency of Groundwater Sampling MW-1 through MW-8, and VW-1A through VW-4 sampled <br /> quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Current Remediation Techniques Natural attenuation/SVE with air sparge to be installed <br /> Approximate Depth to Groundwater 47 29 to 48 91 feet below ground surface (bgs) <br /> Groundwater Gradient Southeast 0 0 04 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 organicss(RO) <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(i e,a non-TPHg analyte or a single TPHg analyte),the analyte will be identified if possible <br /> Y\Wpro ess\35 6P ARC0Q21MQuever1y\2 QTR 64\2186 GWMR 2Q64 doe Page 1 <br />