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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> �fi20 West Charter Way <br /> Stockton, CA <br /> W l c #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DO <br /> Well 10 Date TPPH B T E X 8020 8260 TO Water Elevation Thickness Reading <br /> u /L u /L u /L u /L u /L u /L u /L MSL ft MSL ftm <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> BTEX a benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE= methyl-tertiary-butyl ether <br /> TOC o Top of Casing Elevation <br /> SPH= Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug/L=parts per billion <br /> msl=Mean sea level <br /> it-Feet <br /> cn - Below detection limit <br /> D= Duplicate sample <br /> Notes <br /> ' <br /> -Field data sheets for this event misplaced, no field measurements available for this event <br /> 11 <br /> When separate-phase hydrocarbons are present,ground water elevation is adjusted using the relation <br /> Corrected groundwater elevation e Top-of-casing elevation -depth to�water+(0 8 x hydrocarbon thickness) <br /> 0Page 16 <br />