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WELL CONCENTRATIONS <br /> Shell-branded 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 8020 8260 TOC Water Elevation Thickness <br /> (ug/L (ug/L (ug/L u IL1_Ju_gAQ u IL u IL MSL ft MSL ft <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to July 27, 2001,analyzed by EPA Method 8015 <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82606,pnor 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 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 /> 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 /> Sannella Pier well elevation referenced from Survey Marker <br /> Wells MW-2 through MW-14 and RWAA surveyed February 20,2002, by Virgil Chavez Land Surveying of Vallejo, California <br /> Page 23 <br />