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WELL CON ENTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u IL u IL u IL u IL u ILu IL u IL MSL ft ft MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior 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 82606, prior to May 11,2001, analyzed by EPA Method 8020 <br /> MTBE= Methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH =Separate-Phase Hydrocarbon;, <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug1L= Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean Sea Level <br /> ft=Feet <br /> m= Below detection limit <br /> NA= Not Applicable <br /> !Votes <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 chlorinated 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 due to the presence of Tetrachloroethene <br /> Dissolved Oxygen readings given prior to well purging <br /> Site surveyed November 30,2001,and September 20, 2002, by Virgil Chavez Land Surveying of Vallejo,California <br /> Top-of-casing measurements prior to December 7,2001,are measured to arbitrary Site Datum <br /> Page 11 <br />