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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC, Water Elevation Thickness <br /> u IL u IL u IL u /L u IL u IL u IL MSL1 ft MSL ft <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82608, prior to May 14,2001,analyzed by EPA Method 8015,except where noted <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 82608, prior to May 14, 2001,analyzed by EPA Methlod 8020, except where noted <br /> MTBE=Methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SAH=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 /> NA= Not applicable <br /> Notes <br /> I <br /> a= Pre-Development water level <br /> b=Post-Development water level <br /> c=This sample analyzed outside of EPA recommended holding time <br /> d=TPPH and BTEX analyzed by EPA Method 8260E <br /> Site surveyed January 8,2000,by Virgil Chavez Land Surveying of Vallejo, California <br /> Site surveyed January 14,2002, by Virgil Chavez Land Surveying of Vallejo,California <br /> I <br /> i <br /> P 4 <br />