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IiWELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 2575 Country Club <br /> Stockton,CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 802Q 8260 DIPE ETBE TAME TBA Methanol Ethanol EDB 1,2-DCA TOC Water Elevation Thickness <br /> u (u/L (ug/L (u/L (u/L WN u AL u /L WLa IL (u/L (ug/L u /L u ll N hint! MSL1 14% MSL1 14 <br /> Notes <br /> a=Depth to ground water measurement and reference elevation datum is top of boot{adapted far 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 /> e=Hydrocarbon does net match pattern of laboratory's standard <br /> f=MW-23 is a Trip Blank <br /> g=Analyzed by STL <br /> h=Analyzed by ICiff <br /> i=Well MW-5 destroyed on August 27,2004 <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 8260E <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 MVV-15 provided by Cambria Environmental Technology Inc <br /> Page 24 <br />