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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7267 Country Club <br /> Stockton, CA <br /> Wic #204-7524-0204 <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 uIL u & (ug/L (ug/L u IL u 1L u 1L MSL ft. MSL ft. <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606;prior to January 29,2001,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 29,2001,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 /> 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 /> Site surveyed January 7, 2002, by Virgil Chavez Land Surveying of Vallejo,California. <br /> i <br /> r <br /> Pa e 6 <br />