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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 2375 West Grant Line Road <br /> Tracy, CA ` <br /> M <br /> MTBE Depth to GW <br /> Well ID Date TPPH BT E X 8260 DIPE ETBE TAME TBA Ethanol TOC Water Elevation <br /> u IL u IL u u L u L u L u u L u L u L u L MSL ft MSL <br /> I <br /> MW-4 317!2003 <50 <0 50 <0 50 <0 50, <0 50 100 <20 <2 0 <2 0 <50 NA NA 997 NA <br /> MW-4 4/9/2003 <50 <0 50 <0 50 <0 50 <0 50 10 <20 <2 0 <2 0 <50 NA 2256 _ 1008 1248 <br /> MW-4 7/3012003 <50 <0 50 <0 50 <0 50' <1 0 74 t <20 <20 <2 0 <5 0 NA 2256 1031 1225 <br /> MW-4 10/27/2003 <50 <0 50 <0 50 <0 50 <1 0 52 <2 0 <20 <2 0 <5 0 NA 2256 1035 1221 <br /> MW-4 1/2612004 <50 <0 50 <0 50 <0 50 <1 0 26 <2 0 <2 0 <20 <5 0 NA 2256 999 1257 <br /> MW-4 4/26/2004 <50 <0 50 <0 50 <0 50 <1 0 120 <2 0 <2 0 <20 <50 NA 2256 1029 1227 <br /> MW-4 7/30/2004 <50 <0 50 <0 50 <0 50` 1 <1 0 45 <2 0 <2 0 <20 _ <50 <50 2256 992 12 84 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline try 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 82608 , <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B , <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8269E <br /> TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation 1 <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 /> Ethanol analyzed by EPA Method 82608 <br /> Site surveyed March 7,2003 by Mid Coast Engineers <br /> P 2 <br />