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ATTACHMENT A <br /> REMEDIAL ACTION PERFORMANCE SUMMARY FIRST QUARTER 2004 <br /> Ozone Sparge System <br /> 7,SiteName Circle K Stare#011192 Start-Up bate Dec 2002 <br /> ess 1403 Country Club Drive, Stockton Estimated Shutdown Date NLkjl <br /> REMEDIAL OBJECTIVES <br /> OPERATIONAL DATA(First Quarter 2004) <br /> Ozone Sparge Treatment System Data January February March <br /> Operational Status Non-OperationalNon-Operational Operational IlCumulative <br /> Mass Ozone Injected(Ibs) -- -- 30 34 <br /> TPHg, Benzene and MtBE Summary January February March <br /> MW3 Concentration TPHg(Ng/L) <5000 <10000 <5000 <br /> Concentration Benzene(pg/L) <50 <100 <50 <br /> Concentration MtBE(Ng/L) <200 <400 <50 <br /> Concentration TBA(Ng/L) 99,000 110,000 58,000 <br /> MW4 Concentration TPHg (dig/L) <50 <50 <50 <br /> Concentration Benzene(pg/L) <0 50 <0 50 <0 50 <br /> Concentration MtBE(pg/L) 81 39 34 <br /> Concentration TBA(jag/L) <100 0 <100 <5 0 <br /> REMEDIAL ACTION PERFORMANCE EVALUATION <br /> ,&ACTION5IRECOMMENDATIONS <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 =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 /> TBA =Tert-butyl alcohol <br /> =Not available <br /> Note When appropriate,tabulated data is followed b ra hical presentation <br />