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h <br /> ATTACHMENT A <br /> REMEDIAL ACTION PERFORMANCE SUMMARY FOURTH QUARTER 2003 <br /> Ozone Sparge System <br /> Site Name ConocoPhillips Station#5886 Start up date 1st Q 2002 <br /> Site Address 3701 W March Lane, Stockton Estimated Shutdown Date NA <br /> REMEDIAL OBJECTIVES <br /> OPERATIONAL DATA(Fourth Quarter 2003) <br /> Ozone Sparge Treatment System Data October November December <br /> Operational Status Operational Operational Operational Cumulative <br /> Mass Ozone Infected(lbs) 001 000 074 19 <br /> TPHg, Benzene and MtBE Summary October November December <br /> MW 1 Concentration TPHg(Ng/L) <50 95 <50 <br /> Concentration Benzene(pg/L) <0 5 <0 5 <0 5 <br /> Concentration MtBE(pg/L) 089 100 59 <br /> MW2 Concentration TPHg(ug/L) <50 <50 <50 <br /> Concentration Benzene(pg/L) <0 5 <0 5 <0 5 <br /> Concentration MtBE(pg/L) <0 5 <2 <2 <br /> MW3 Concentration TPHg(NgIL) <50 100 51 <br /> Concentration Benzene(pg/L) <0 5 <0 5 <0 5 <br /> Concentration MtBE(ug/L) 41 <2 20 <br /> REMEDIAL ACTION PERFORMANCE EVALUATION <br /> &CTIONS/RECOMMENDATIONS <br /> o Continue operation of the ozone sparge system <br /> NOTES <br /> ppmv =Parts per million by volume <br /> cfm =Cubic feet per minute <br /> lbs =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 />