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I <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 3725 South Tracy Boulevard <br /> Tracy, CA <br /> Wic #204-7884-0901 � <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 IL u IL u IL u IL u IL u IL u IL MSL ft. MSL ft. m <br /> SUMP 11115/2000 <50.0 NA <0.500 <0.500 <0.500 <0.500 <2.50 NA NA 10.25 NA NA NA <br /> RW 06/05/2001 73 NA 1.0 2.1 1 0.71 5.6 NA <0.50 NA 5.34 NA NA NA <br /> Abbreviations: <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82606; 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 8260B; 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 <br /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA= Not applicable <br /> Notes: <br /> Wells MWA through MW-3,were decommissioned in July 1990 during station reconstruction and replaced by MW-1A through MW-3A in August 1990. <br /> Site surveyed February 24, 2002, by Virgil Chavez Land Surveying of Vallejo, California. <br />