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WELL CON41ENTRATIONS • `` <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue • <br /> Stockton, CA <br /> Wic #204-7525-0104 <br /> MTBE MTB Depth to Depth to G SPH D <br /> Well [D Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u IL u _ u IL u IL u IL u IL u IL MSL ft ft MSL ftm <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608, pnor to May 11,2001,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 May 11, 2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl-ternary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SAH=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 /> NA= Not Applicable <br /> Notes <br /> *=Chromatogram pattern indicates an unidentified hydrocarbon <br /> a=Analyzed outside of EPA recommended hold time <br /> b=The TPPH values for these samples are primarily caused by the presence of chIon nated compounds <br /> c=Survey date <br /> d=Based on historical data,the samples for MW-6 and MW-7 appear to have been switched <br /> e=The reported value is primarily doe to the presence of Tetrachloroethene <br /> Dissolved Oxygen readings given pnor to well purging <br /> Site surveyed November 30,2001,by Virgil Chavez Land Surveying of Vallejo,California <br /> Top-of-casing measurements pnor to December 7,2001, are measured by Site Datum <br /> Page 11 <br />