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Date October 27,2004 <br /> Quarter 3`d 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 (Third 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-lA,VW-2A,VW-3A,and VW-4 <br /> 2 Prepared and subrrntted quarterly groundwater monitoring report <br /> 3 Started operation of the Soil Vapor Extraction(SVE) system August 30,2004 System currently off due to noise <br /> complaint from neighbor URS )Installing sound enclosure for system <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2004)- <br /> 1 Perform quarterly groundwater monitoring and sampling <br /> • 2 Prepare and submit quarterly groundwater monitoring report <br /> 3 Perform operation and maintenance of SVE system <br /> QUARTERLY RESULTS SUMMARY (Third 2004): <br /> Current Phase of Project Monitoring/ Remediation <br /> Frequency of Groundwater Sampling MW-1 through MW-8, and VW-1A through VW-4 sampled <br /> quarterly <br /> Frequency of Groundwater Monitoring Quarters <br /> Is Free Product (FP) Present on Site No <br /> FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> GRO Removed This Quarter 93 6 pounds <br /> Benzene Removed this Quarter 0 pounds <br /> MtBE Removed this Quarter 2 4 pounds <br /> Cumulative GRO Removed to Date 93 6 pounds <br /> Cumulative benzene Removed to Date 0 pounds_ <br /> Cumulative MtBE Removed to Date 2 4 pounds _ <br /> Current Remediation Techniques SVE Treatment System <br /> Approximate Depth to Groundwater 53 52 to 55 10 feet below ground surface b s <br /> Groundwater Gradient Southwest to Southeast @ 0 009 _0 04 feet/foot (ft/ft) <br /> r <br /> K%Wp—,essll5 BP ARCOb2186\QuarterW00413 QTR 04\2186 GWMR 3Q04 do Page 1 <br />