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WELL CO&TRATIONS <br /> Shell-branded Service Station <br /> 2575 Country Club <br /> Stockton, CA <br /> Wic #204-7524-3505 <br /> MTBE 7 MTBE Depth to GW SPH <br /> Well ID I Date TPPH 1 B T E X 8020 I 8260 TOC Water Elevation Thickness <br /> (ug/L u IL u IL u /L u IL u IL I (ug/L MSL ft MSL ft <br /> Sannella Pier 1128/00 NA NA NA NA NA NA NA 1390 1118 272 NA <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to July 27, 2001,analyzed by EPA Method 8015 <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B,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/t.=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 is 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 20 <br />