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�� �� � ttttttttt� ttttttttt>• � 1• � � � � I• � � � � � I• <br /> 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 DIPE ETBE TAME TBA Ethanol TOC Water Elevation <br /> (ug/L (ug/L u IL (ug/L (ug/L u 1L u IL u IL u IL u IL a IL MSL ft MSL <br /> MW-4 3/7/2003 <50 <0 50 <0 50 <0 50 <0 50 100 <2 0 <2 0 <2 0 <50 NA NA 997 NA <br /> MWA 4/9/2003 <50 <0 50 <0 50 <0 50 <0 50 10 <2 0 <2 0 <2 0 <50 NA 2256 1008 1248 <br /> MW-4 7/3012003 <50 <0 50 <0 50 <0 50 <1 0 74 <2 0 <2 0 <2 0 <50 NA 2256 1031 1225 <br /> MW-4 10/27/2003 <50 <0 50 <0 50 <0 50 <1 0 52 <2 0 <2 0 <2 0 <50 NA 2256 1035 1221 <br /> MW-4 1 1/26/2004 1 <50 1 <0 50 1 <0 50 <0 50 <1 0 1 26 1 <2 0 <2 0 1 <2 0 1 <60 NA 1 2256 999 1257 <br /> MW-4 4/26/2004 <50 <0 50 <0 50 <050 <1 0 120 <2 0 <2 0 <20 <50 NA 2256 1029 1227 <br /> MW-4 713012004 <50 <0 50 <0 50 <0 50 0 0 45 <2 0 <2 0 <2 0 <5 0 <50 2266 992 12 64 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 <br /> BTEX=Benzene toluene ethylbenzene xylenes by EPA Method 8260B <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 8260B <br /> TBA=Tertiary butyl alcohol or tertiary butanol analyzed by EPA Method 8260B <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=Hydrocarbon does not match pattern of laboratory's standard <br /> Ethanol analyzed by EPA Method 82608 <br /> Site surveyed March 7 2003 by Mid Coast Engineers <br /> Page 2 <br />