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WELL CONCENTRATIONS <br /> Shelf-branded Service Station <br /> 2494 Fremont Street <br /> Stockton, CA <br /> MTBE MTBE �� Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 RIPE J_�TBE TAME TBA 1,2-DCA EDB Methanol Ethanol TOC Water Elevation Thickness <br /> u /L u 1L u IL u 1L u 1L u IL u IL u IL IL u IL u /L (uall u IL ti` ll u !L MSL fl MSL ft <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B prior to May 14 2001 analyzed by EPA Method 8015,except where noted <br /> STEX=Benzene,toluene,ethylberizene,xylenes by EPA Method 82606,prior to May 14 2001,analyzed by EPA Method 8020,except where noted <br /> MTBE=Methyl tertiary butyl ether <br /> TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 82608 <br /> DIPE=DI-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method B2606 <br /> TAME=Tertiary amyl methyl ether,analyzed by EPA Method 8260B <br /> 1,2-DCA=1,2-Dlchloroethane,analyzed by EPA Method 82606 <br /> EDB=1,2-Drbromoethane,analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> ug1L=Parts per billion <br /> MSL=Mean sea level <br /> ft =Feet <br /> <n=Below detection limit <br /> NA=Not applicable <br /> Notes <br /> a=Pre-Development water level <br /> b=Post-Development water level <br /> c=This sample analyzed outside of EPA recommended holding time <br /> d=TPPH and BTEX analyzed by EPA Method 8260B <br /> e=Hydrocarbon does not match pattern of laboratory's standard <br /> 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-4-85 <br /> Ethanol and Methanol analyzed by EPA Method 82608 <br /> Site surveyed January 8,2000 by Virgil ChavezlLand Surveying of Vallejo,CA <br /> Site surveyed January 14,2002 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Wells S-1-85 S-3-84,and S-4-83 surveyed December 23 2002 <br /> Wells S-2-85,S-5,and S-6 surveyed December 23,2002 <br /> i <br /> 6 <br /> P Pa e <br /> � � <br />