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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) (ug/L) (ug/L) (ug/L} (ug/L) (u IL) u IL (MSL) (ft) (MSL) ft) ( pm) <br /> MTBE= methyl-terhary-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 /> msl=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> D= Duplicate sample <br /> NA= Not applicable <br /> ppm= parts per million <br /> Notes <br /> The original wells, MW-1 through MW-3,were decommissioned in July 1990 dunng station reconstruction <br /> They were replaced by MW-1A through MW-3A in August 1990 <br /> I <br /> I <br /> 1 <br /> Page 5 <br />