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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 3725 South Tracy Boulevard <br /> Tracy, CA <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> u IL u /L u IL ug/L)( (ug/L u IL u IL u IL MSL ft. MSL ft. m <br /> BF-1 10/24/2001 <200 NA <2.0 <2.0 <2.0 <2.0 NA 690 NA 9.20 NA NA NA <br /> BF-1 01/23/2002 <50 NA <0.50 <0.50 <0.50 <0.50 NA 130 NA 8.75 NA NA NA <br /> BF-1 04/18/2002 <50 NA <0.50 <0.50 <0.50 <0.50 NA 54 14.60 9.05 5.55 NA NA <br /> BF-1 07115/2002 <50 NA <0.50 <0.50 <0.50 <0.50 NA I <5.0 1 14.60 1 9.54 5.06 NA NA <br /> SUMP 11/15/2000 <50.0 NA <0.500 <0.500 <0.500 1 <0.500 1 <2.50 NA NA 10.25 NA NAJ NA <br /> RW 06/05/2001 73 NA 1.0 2.1 0.79 1 5.6 NA <0.50 NA 5.34 NA NA NA <br /> y P <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B; prior to January 23, 2001,analyzed by EPA Method 8015. <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015. <br /> BTEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 82606; prior to-January 23, 2001,analyzed by EPA Method 8020. <br /> MTBE= Methyl-tertiary-butyl ether ` <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater - <br /> DO=Dissolved Oxygen <br /> RW=Rediscovered well <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft=Feet i <br /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br />