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WELL CONCENTRATIONS ' <br /> Shell-branded Service Station <br /> 2375 West Grant Line Road <br /> Tracy, CA <br /> MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8260 DIPS ETBE TAME TBA TOC Water Elevation <br /> (ug/L (ug/L (u/L (u/L (u/L (u/L (u/L u /L (u/L (ual) MSL ft MSL <br /> MW-4 01/26/2004 <50 <0 50 <0 50 <0 50 <1 0 26 <2 0 <20 <20 <5 0 22 56 999 12 57 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 <br /> BTEX= Benzene, toluene, ethylbenzene,xylenes by EPA Method 8260E <br /> MTBE= Methyl-tertiary-butyl ether <br /> DIPE= Di-isopropyl ether <br /> ETBE Ethyl tertiary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> TBA=Tertiary butyl alcohol or tertiary butanol <br /> TOC=Top of Casing Elevation <br /> GW = Groundwater <br /> ug/L= Parts per billion <br /> MSL= Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> NA= Not applicable <br /> Notes <br /> a= Hydrocarbon does not match pattern of laboratory's standard <br /> Site surveyed March 7,2003 by Mid Coast Engineers <br /> Page 2 <br />