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• WELL CONOTRATIONS • Shell-branded Service Station 2494 Fremont Street Stockton, CA MTBE MTBE Depth to GW 2krnmess Well ID Date TPPH B T E X 8020 8260 DIPE ETBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Thi u /L uIL uIL u /L u !L uIL (ug/LLuIL uIL uIL uIL uIL u /L uIL uIL (MSL) ft MSL Abbreviations TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608 prior to May 14 2001 analyzed by EPA Method 8015,except where noted BTEX=Benzene toluene ethylbenzene,xylenes by EPA Method 82608 pnor to May 14 2001 analyzed by EPA Method 8020,except where noted MTBE=Methyl tertiary butyl ether TBA=Tertiary butyl alcohol or tertiary butanol analyzed by EPA Method 8260B DIPE=DI-isopropyl ether,analyzed by EPA Method 8260B ETRE=Ethyl tertiary butyl ether,analyzed by EPA Method 8260B TAME=Tertiary amyl methyl ether analyzed by EPA Method 8260E 1,2-DCA=1 2-Dichloroethane analyzed by EPA Method 82608 EDB=1 2-Dlbromoethane,analyzed by EPA Method 82606 TOC=Top of Casing Elevation SPH=Separate-Phase Hydrocarbons GW=Groundwater ug/L=Parts per billion MSL=Mean sea level ft =Feet cn=Below detection limit NA=Not applicable Notes a=Pre-Development water level b=Post-Development water level c=This sample analyzed outside of EPA recommended holding time d=TPPH and BTEX analyzed by EPA Method 82606 e=Hydrocarbon does not match pattern of laboratory's standard f=On December 30,2003 Chain of Custody well S-3-84 incorrectly listed as S-3-85 and well S-4-83 incorrectly listed as S-485 Ethanol and Methanol analyzed by EPA Method 8260B Site surveyed January 8 2000 by Virgil Chavez Land Surveying of Vallejo,CA Site surveyed January 14 2002 by Virgil Chavez Land Surveying of Vallejo CA Wells S-1-85 S-3-84,and 5-4-83 surveyed December 23 2002 Wells S-2-85,S-5,and S-6 surveyed December 23,2002 Page 6 i