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WELL CONCRTRATIONS <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 DIPE ETBE TAME TBA Ethanol TOC Water Elevation <br /> u IL UQ/Q__ (ug/L (Ug/L (ug/L u l (ug/L (ug/L (ug/L .__(N/L) (ug/L MSL ft MSL <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82608 <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82606 <br /> i <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di-isopropyl ether, analyzed by EPA Method 8260B <br /> ETBE= Ethyl tertiary butyl ether, analyzed by EPA Method 8260B <br /> TAME=Tertiary amyl methyl ether, analyzed by EPA Method 82606 <br /> TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 8260B <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 /> b=The concentration reported reflects individual or discrete unidentified peaks not matching a typical fuel pattern <br /> Ethanol analyzed by EPA Method 82606 <br /> Site surveyed March 7,2003 by Mid Coast Engineers <br /> Page 3 <br />