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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 1267 Country Club <br /> Stockton, CA <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 (ug/L u L u L (ug/L u IL (u/L u 1L (MSL)___ ft. MSL ft. <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 826013; 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 82608; 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 /> m= 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 /> 11 <br /> a=This sample was analyzed outside of EPA recommended hold time. <br /> Site surveyed January 7, 2002, by Virgil Chavez Land Surveying ofValleJo California. <br /> i <br />