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i <br /> WELL CONCENTRATIONS <br /> Shell�branded Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> Wlc #204-7524-0204 <br /> A <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> u IL (u /L) ((u/L (u/L (uglL) (u /L) (u/L (u/L MSL ft MSL ft <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 /> 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 /> ND= Not detected at or above the minimum quantitation limits <br /> Notes <br /> * MTBE by EPA method 8260 was run out of recommended hold time,value should be considered an estimate <br /> a=This sample was analyzed outside of EPA recommended hold time <br /> Page 4 <br />