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ATTACHMENT A <br /> REMEDIAL ACTION PERFORMANCE SUMMARY FIRST QUARTER 2004 <br /> Ozone Sparge System <br /> 7S,1Name ConocoPhillips Station#6981 Start-Up Date 12/19/01 <br /> Address 4707 Pacific Ave Stockton Estimated Shutdown Date NA <br /> REMEDIAL OBJECTIVES <br /> OPERATIONAL DATA(First Quarter 2004) <br /> Ozone Sparge Treatment System Data January February March <br /> Operational Status OperatioNon-Operational Operational Cumulative <br /> nal <br /> Mass Ozone Injected (Ibs) 2 20 - 1 338 96 <br /> TPHg,Benzene and MtBE Summary January February March <br /> MW16 Concentration TPHg (pg/L) 110 67 50 <br /> Concentration Benzene(pg/L) 13 5 3 22 <br /> Concentration MtBE(pg/L) 15 10 43 <br /> VW7 Concentration TPHg(pg/L) 7,900 10,000 7,700 <br /> Concentration Benzene(pg/L) 4 6 8 0 5 7 <br /> Concentration MtBE(pg/L) <10 X10 <5 0 <br /> REMEDIAL_ACTION PERFORMANCE EVALUATION <br /> ACTIONSIRECOMMENDATIONS <br /> o Continue operation of the ozone sparge system <br /> t <br /> OTES <br /> pmv = Parts per million by volume <br /> cfm =Cubic feet per minute <br /> Ibs =Pounds <br /> SVE =Soil Vapor extraction <br /> ND =Not detected above the detection limit <br /> TPHg =Total petroleum hydrocarbons as gasoline <br /> MtBE =Methyl tert-butyl ether <br /> =Not available <br /> Note When appropriate,tabulated data is followed by graphical presentation <br /> • <br />