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WELL CONCENTRATIONS <br /> Former Shell Service Station <br /> 1160 West Yosemite Avenue <br /> Manteca, CA <br /> MTBE Depth to GW <br /> Well ID Date TPPH B T E X 8260 DIPE ETBE TAME TBA 1,2-DCA EDB TOC Water Elevation <br /> tt IL u IL u !L u IL Nall-) u IL u IL u /L u IL u IL u IL u IL MSL ft MSL <br /> MW-5 6/8/2004 NA NA NA NA NA NA NA NA NA NA NA NA 2871 2179 692 <br /> MW-5 6/2212DD4 <50 <0 50 <0 50 0050 <1 0 <0 50 <2 0 <2 0 <2 0 <50 085 <0 50 2871 2309 562 <br /> MW-5 9/28/2004 <50 <0 50 <0 50 <0 50 <1 0 <0 50 <2 0 <2 0 <2 0 <5 0 14 <0 50 213 71 2338 533 <br /> MW-5 12/28/2004 <50 <0 50 <0 50 <0 50 <1 0 <0 50 <2 0 <20 <2 0 <5 0 067 <0 50 2871 1961 910 <br /> MW-5 3/15/2005 <50 <0 50 <0 50 <0 50 <1-L- NA NA NA NA I <5 0 1 <0 50 NA 1 2871 1668 1 1203 <br /> MW-5 6!1412005 <50 <0 50 <0.50 <0 5D <1 0 NA NA NA NA 63 -CO 50 NA 28,71 1824 1047 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8260B <br /> BTEX=Benzene,toluene,ethyibenzene,xylenes by EPA Method 82606 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di-isopropyl ether,analyzed by EPA Method 82608 <br /> ETBE=Rhyl tertiary butyl ether,analyzed by EPA Method 8260E <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol,analyzed by EPA Method 8260B <br /> 1,2-RGA=1,2-Dichloroethane,analyzed by EPA Method 8260B <br /> EDB= Ethylene Dibromide, 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 lima <br /> NA=Not applicable - <br /> Notes <br /> a=Quantity of unknown hydrocarbon in sample based on gasoline <br /> Site surveyed June 4,2004 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Page 2 <br />