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WELL CONONTRATIONS <br /> Shell-branded Service Station <br /> 2320 North Eldorado <br /> Stockton, CA <br /> MTBE Depth to GW <br /> Well ID Date TPPH B TE X 8260 TBA DIPE ETBE TAME TOC Water Elevation <br /> u IL u IL u IL u IL u IL u IL (ug/L (u/L (u/L (u/L MSL ft MSL <br /> MW-4 1 01116/2004 <50 I <0 50 1 <050 I <0 50 1 <1 0 1 <0 50 <5 0 1 <2 0 <2 0 <2 0 9 94 1 35 74 -25 80 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606 <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B <br /> MTBE =Methyl-ternary-butyl ether <br /> DIPE= Di-isopropyl ether <br /> ETBE= Ethyl tertiary butyl ether <br /> i <br /> TAME=Tertiary amyl methyl ether <br /> TBA=Tertiary butanol or tertiary butyl alcohol <br /> TOC=Top of Casing Elevation <br /> GW =Groundwater <br /> ug1L= Parts per billion <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n= Below detection limit <br /> NA= Not applicable <br /> Notes <br /> a= Hydrocarbons reported as TPH as gasoline do not exhibit a typical gasoline chromatographic pattern/Hydrocarbon does not match <br /> pattern of laboratory's standard <br /> b= Hydrocarbons reported as TPPH do not exhibit a typical Gasoline chromatographic pattem for sample MW-2 Two compounds <br /> not normally associated with gasoline,Tetrachloroethene and Tnchloroethene, are present in the TPPH spectrum for sample MW-2 <br /> Site surveyed March 7, 2003, by Mid Coast Engineers <br /> Page 2 <br />