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a i ! WELL CONCENTRATIONS Former Shell Service Station 1071 North Main Street Manteca, CA MTBE MTBE Depth to GW DO [well ID Date TPPH B T E X 8020 8260 DIPE ETBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Reading u IL u 1L u IL u 1L u /L u 1L u IL u !L u IL u IL u 1L u IL u 1L u IL u /L MSL ft MSL (ppm) MW-3 07/08/2005 150 <0 50 <0 50 <0 50 1 <1 0 1 NA <0 50 NA NA I NA NA NA NA NA NA 1 35 34 1 2548 98613 93 MW-3 10110/2005 <50 <0 50 <0 50 <0 50 <1 0 NA <0 50 NA NA NA NA NA NA NA NA 35 34 23 32 12 D2 2 0 Abbreviations TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B prior to July 11 2001 analyzed by EPA Method 8015 except where noted BTEX=Benzene toluene ethylbenzene,xylenes by EPA Method 8260B prior to July 11 2001 analyzed by EPA Method 8020 except where noted MTBE=Methyl tertiary butyl ether DIPE=Di-isopropyl ether by EPA Method 8260B ETBE= Ethyl tertiary butyl ether by EPA Method 8200B TAME=Tertiary amyl methyl ether by EPA Method 82608 TBA=Tertiary butyl alcohol or Tertiary butanol by EPA Method 82606 1 2-DCA=1 2-drehloroethane by EPA Method 8010 or 82608 EDB=Ethylene drbromode ort 2-dibromoethane by EPA Method 8010 or 82606 TOC=Top of Casing Elevation DO=Dissolved Oxygen GW=Groundwater ug1L=Paris per billion ppm=Parts per million MSL=Mean sea level ft =Feet <n=Below detection limit (D)=Duplicate sample Notes a=Sample reanalyzed past hold time,results should be considered estimates b=Hydrocarbon does not match pattern of laboratory's standard Ethanol and Methanol analyzed by EPA Method 8260E TPPH and BTEX analyzed by EPA Method 8260B on January 23 2001 For the April 26 2001 event Sequoia's courser mistakenly took samples which were intended for Kiff Analytical Site surveyed May 7 2002 by Virgil Chavez Land Surveying of Vallejo CA Page 4