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ATTACHMENT A <br /> =:>: REMEDIAL ACTION PERFORMANCE SUMMARY: FIRST QUARTER 2004 <br /> Ozone Sparge System <br /> Site Name: 76(Former BP)Station No. 11195 Start-Up Date: 12/20/02 <br /> Site Address: 16500 Interstate 5 South,Lathrop 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 Non-Operational Operational Operational Cumulative <br /> Mass Ozone Injected(lbs) -- 2.0 6.2 IE82l <br /> TPHg,Benzene and MtBE Summary January February March <br /> MW3 Concentration TPHg(NgIL) 630 <250 220 <br /> Concentration Benzene(pg/L) <5.0 <2.5 <1.0 <br /> Concentration MtBE(NgIL) 1100 300 270 <br /> MW3 Concentration TPHg(pg/L) <50 <50 <50 <br /> Concentration Benzene(pgIL) <0.50 <0.50 <0.50 <br /> Concentration MtBE(pg/L) <2.0 11 <0.50 <br /> REMEDIAL ACTION PERFORMANCE EVALUATION <br /> ACTION SIRECOMMEN DATIONS <br /> o Continue operation of the ozone sparge system <br /> ppmv =Parts per million by volume <br /> dm =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 /> i <br />