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ti <br /> ATTACHMENT A <br /> REMEDIAL ACTION PERFORMANCE SUMMARY FOURTH QUARTER 2003 <br /> Ozone Sparge System <br /> Site Name ConocoPhdlips Station#6981 Start-up Date November 2001 <br /> Site Address 4707 Pacific Ave,Stockton Estimated Shutdown DateNA <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 Injected (Ibs) 673 480 2 54 96 <br /> TPHg,Benzene and MtBE Summary October November December <br /> MW 16 Concentration TPHg(ug/L) 190 130 4,100 <br /> Concentration Benzene(pg/L) 22 17 96 <br /> Concentration MtBE(pgtL) 17 14 <10 <br /> VW7 Concentration TPHg(lag/L) 12,000 6,200 83 <br /> Concentration Benzene(pg/L) 13 84 94 <br /> Concentration MtBE(Ng/L) <5 <10 12 <br /> REMEDIAL ACTION PERFORMANCE EVALUATION <br /> ACTIONS/RECOMMENDATIONS <br /> o Continue operation of the ozone sparge system <br /> Ask <br /> WINOTES <br /> ppmv =Parts per million by volume <br /> cfm =Cubic feet per minute <br /> lbs =Pounds <br /> SVE =Sod 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 graehical presentation <br />