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WELL CONCENi <br /> TRATIONS <br /> Shell-branded Service Station - <br /> 3725 South Tracy Boulevard <br /> Tracy, CA <br /> Wic #204-7884-0901 <br /> MTBE MTBEDepth 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 1L u IL u IL u /L MSL ft MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=benzene,toluene,ethylbenzene,xylenes 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 /> 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 /> The original wells, MW-1 through MW-3,were decommissioned in July 1990 during station reconstruction <br /> They were replaced by MW-1A through MW-3A in August 1990 <br /> Page 5 <br />