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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 2575 Country Club <br /> Stockton,CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPHLS T E X 8020 8260 DIPS ETBE TAME TBA Methanol Ethanol EDB 1,2-DCA TOC Water Elevation Thickness <br /> u IL u /L (U911 fug/ (1-11) u /L a IL u IL u IL u 1t. u /L u /L u /L u !L MSL ft MSL ft <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608,prior to July 27,2001 analyzed by EPA Method 8015 <br /> BTEX=Benzene,toluene,ethylbenzene xylenes by EPA Method 82608,prior to July 27 2001 analyzed by EPA Method 8020 <br /> MTBE=Mothyl tertiary butyl ether 11 <br /> DIPE=Di-isopropyl ether analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ether analyzed by EPA Method 82608 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 8260B <br /> EDB=1,2-Dibromoethane,analyzed by EpA Method 82608 <br /> 1 2-DCA=1 2-Dichloroethane analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> SPK=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> ug/L=Parts per billion <br /> MSL=Mean sea level <br /> it =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 /> 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 /> u <br /> e=Hydrocarbon does not match pattern of laboratory's standard <br /> f=MW-23 is a Trip Blank <br /> g=Analyzed by STL <br /> h=Analyzed by Kff <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 /> Ethanol and Methanol analyzed by EPA Method 82608 <br /> Sannella Pier well elevation referenced from Survey Marker <br /> Wells MW-2 through MW-14,and RW-1A surveyed February 20,2002 by Virgil Chavez land Surveying of Vallejo,CA. <br /> 3rd Quarter 2004 TOC elevation for MW 15 provided by Cambria Environmental Technology,Inc <br /> • P 22 • <br />