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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2575 Country Club <br /> Stockton, CA <br /> MTBE MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8020 8260 TOS: Wager Elevation :TTh:ickness <br /> u IL u IL u IL u IL u IL u /L u IL MSI_ ft MSL <br /> I <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608, prior to July 27,2004,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=Methyl-tertiary--butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH =Separate-Phase Hydrocarbons <br /> GW =Groundwater <br /> ug1L=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 RW-1A surveyed February 20,2002, by Virgil Chavez land Surveying of Vallejo, California <br /> P 24 • <br />