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WELL COANTRATIONS <br /> Shell-branded Service Station <br /> 2575 Country Club <br /> Stockton, CA <br /> Wlc #204-7524-3505 <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> u 1L u IL u IL u IL u IL u IL u IL MSL ft MSL ft <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 82608, prior to July 27, 2001,analyzed by EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene,xylenes by EPA Method 82606, prior to July 27, 2001,analyzed by EPA Method 8020 <br /> MTBE=methyl-tertiary-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 /> D=Duplicate sample <br /> NA=Not applicable <br /> Notes <br /> a = Depth to ground water measurement and reference elevation datum as top of boot(adapted for vapor extraction)at well head <br /> Sannella Pier well elevation referenced from Survey Marker <br /> Port= Indicates ground water sample collected at the well head sampling port <br /> Down= Indicates ground water sample collected inside the well with a bailer <br /> b=Not sampled due to insufficient water capacity on the truck <br /> c= Result reported was generated out of hold time <br /> d=Top of casing elevation altered during wellhead maintenance <br /> i <br /> Page 21 <br />