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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, CA <br /> i <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevati11 <br /> on Thickness <br /> u IL u IL u IL u /L u IL (ug/D. (ug/L MSL ft MSL ft <br /> Abbreviations 11 <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to May 14,2001, analyzed by EPA Method 8015, except where noted <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B, prior to May 14,2001,analyzed by EPA Method 8020,except where noted <br /> MTBE=Methyl-ternary-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 /> NA= Not applicable <br /> Notes <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 STEX analyzed by EPA Method 82608 <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 /> r P*4 • <br /> i <br />