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_y <br /> 1 <br /> ATTACHMENT A <br /> REMEDIAL ACTION PERFORMANCE SUMMARY FIRST QUARTER 2004 <br /> Ozone Sparge System <br /> Site Name 76 Service Station No 5886 Startup Date 1st Quarter 2002 <br /> Site Address 3701 W March Lane 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 j[�p—erati�ori�3—l-7F—OperationaI Operational Icumulative <br /> Mass Ozone Infected (lbs) 068 01 003 19 <br /> TPHg,Benzene and MtBE Summary January Februaa March <br /> MW1 Concentration TPHg (lag/L) 2,700 <200 <50 <br /> Concentration Senzene(pg/L) <25 <20 <0 50 <br /> Concentration MtBE(lag/L) 2,800 2'100 47 <br /> MW2 Concentration TPHg (tag/L) <50 110 <50 <br /> Concentration Benzene(pg/L) <0 50 <0 50 <0 50 <br /> Concentration MtBE (pg/L) <2 0 9 0 <0 50 <br /> MW3 Concentration TPHg (pg/L) 120 <50 <50 <br /> Concentration Benzene(pg/L) <1 0 <0 50 <0 50 <br /> Concentration MtBE(lag/L) 120 47 20 <br /> REMEDIAL ACTION PERFORMANCE EVALUATION <br /> ACTIONSIRECOMMENDATIONS <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 /> - = Not available <br /> Note When appropriate tabulated data is followed by graphical presentation <br />