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WELL CONGr-NTRATIONS <br /> Former Texaco Service Station <br /> 440 W. Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> u IL u IL u IL (ug/L u IL u /L) u IL (ug/L MSL ft.) MSL ft.) <br /> VEW-4 0511612000 1 347 NA 8.66 2.90 <0.500 1.84 20.6 6.08 NA 19.27 NA NA <br /> VEW-4 08/30/2000 1 291 1,720 4.43a 3.21a <0.500a 0.910a <2.50a 14.2 NA 1 20A8 NA NA <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 82606; prior to May 17,2001 analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> STEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 82606;prior to May 17,2001,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 /> uglL=parts per billion <br /> msl= Mean sea level <br /> ft=Feet <br /> <n= Below detection limit <br /> NA=Not applicable <br /> ND= Not detected at or above the minimum quantitation limit. <br /> Notes: <br /> a=Result reported was generated out of hold time. <br /> Page 25 <br />