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WELL CONCENTRATIONS She!!-branded Service Station 2494 Fremont Street Stockton, CA MTBE MTBE „ Depth to GW SPH Well ID Date TPPH B T E X 8020 8260 D1PE ETBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Thickness u /L u /L (11"/l u IL u IL u IL u IL u /L u !L (u2/L) u IL u IL a IL11"'mL u IL MSL ft MSI ft � I Abbreviations i TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B,prior to May 14,2001,analyzed by EPA Method 8015,except where noted BTEX=Benzene toluene ethylbenzene,xylenes by EPA Method 8260B,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 82608 DIPE=DI-isopropyl ether,analyzed by EPA Method 8260B ETRE=Ethyl tertiary butyl ether,analyzed by EPA Method 82608 TAME=Tertiary amyl methyl ether,analyzed by EPA Method 82608 1 2-DCA=1 2-Dichloroethane,analyzed by EPA Method 8260E EDB=i 2-Dibromoethans,analyzed by EPA Method 8260E TOC=Top of Casing Elevation SPH=Separate-Phase Hydrocarbons GW=Groundwater uglL=Parts per billion MSL=Mean sea level It =Feet <n=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 82608 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 S4-85 g=The concentration reported reflects individual or discrete unidentified peaks not matching a typical fuel pattern Ethanol and Methanol analyzed by EPA Method 82606 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 S-4-83 surveyed December 23,2002 Wells S-2-85,S-5,and S-6 surveyed December 23,2002 I � - P 6 -