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WELL CONo- ,_ATRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon,CA <br /> _. _. <br /> MTBE MTBE 1 2.w .:- Depth to Depth GW SPH- DD. <br /> Well ID Date TPPH TEPH B T E X 8026 8260 TBA RIPE ETRE TAME DCA EDB Ethanol Methanol TOC Water to SPH Elevation Thickness Reading <br /> u IL u !L u IL a IL u !L u !L u !L Wall-) u 1L u !L u !L u !L u /L u 1L u 1L u !L MSL ft. ft. MSL k. m <br /> Abbreviations: <br /> w,,TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608;prior to July 10,2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 826013;prior to July 10,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di-isopropyl ether,analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ether,analyzed by EPA Method 62608 <br /> TAME=Tertiary butyl methyl other,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol,analyzed by EPA Method 82608 <br /> 1,2-DCA=1,2-Dichloroethane,analyzed by EPA Method 8260B <br /> EDB=Ethylene dibromide,analyzed by EPA Method 8280B <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft.=Feet <br /> <n=Below detection timit <br /> NA=Not applicable <br /> Notes: <br /> a=DO readings not taken for this event at wells MW-2,MW-3,and EW-2.. <br /> b=MTBE by EPA 8020 not taken for this event. <br /> c=No port,unable to sample. <br /> d=Top of Casing elevation altered during wellhead maintenance. <br /> e=Hydrocarbon does not match pattern of laboratory's standard. <br /> f=The concentration reported reflects individual or discrete unidentified peaks not matching a typical fuel pattem. <br /> MTBE by EPA Method 8260 omitted due to tab error. <br /> "Sample was analyzed past EPA recommended holding time. <br /> MTBE by 6260 for well MWA inadvertently not run for July 9,1999 event. <br /> Ethanol and Methanol analyzed by EPA Method 82608. <br /> Survey of wells performed on March 25,1999 by Virgil Chavez Land Surveying of Vallejo,CA. <br /> Welts MW-4A,MW-413,MW-5A,MW-58,MW-6A,and MW-68 surveyed on January 8,2000 by Virgil Chavez land Surveying of Vallejo,CA. <br /> Revised survey data for wells EW-1 and EW-2 provided by Cambria Environmental Technology,Inc.in January,2001. <br /> Site surveyed May 7,2002 by Virgil Chavez Land Surveying of Vallejo,CA. <br /> Page 11 <br />