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i <br /> WELL CONINTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon,CA <br /> MTBE MTBE 1,2- Depth to Depth GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TBA DIPE ETBE TAME DCA EDB Ethanol Methanol TOC Water to SPH Elevation Thickness Reading <br /> u u IL u IL u 1L fuall-) u 1L u 1L u IL u u fL u u u IL u IL (U91L) u MSL ft. (ft.) MSL ft. m <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbans as gasoline by EPA Method 826013;prior to July 10,2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbans as diesel by modified EPA Method 8015 <br /> BTEX=Benzene,toluene,ethylbeuzene,xylenes by EPA Method 826013;prior to July 10,2001,analyzed by EPA Method 6020 <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=Di-isopropyl ether,analyzed by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether,a ialyzed by EPA Method 82608 <br /> TAME=Tertiary butyl methyl ether,analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol,analy::ed by EPA Method 82608 <br /> 1,2-DCA=1,2-Dichloroethene,analyzed by EPA Method 82608 <br /> EDB=Ethylene dibromide,analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocaft)ns <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> uglL=Parts per billion <br /> ppm=Parts per million <br /> M5L=Mean sea level <br /> ft.=Feet <br /> <n=Below detection limit <br /> PLA=Not applicable <br /> Notes: <br /> a=DO readings not taken for this ovent at wells MW-2,MW-3,and EW-2. <br /> b=MT13E by EPA 8020 not taken Or this event. <br /> c=No port,unable to sample. <br /> d=Top of Casing elevation ahered during wellhead maintenance. <br /> e a Hydrocarbon does not match p ahem of laboratory s standard. <br /> f=The concentration reported reflects individual or discrete unidentified peaks not matching a typical fuel pattern. <br /> `MTBE by EPA Method 8260 omit ed due to lab error. <br /> *'Sample was analyzed past EPA recommended holding time. <br /> `"MTBE by 8260 for well MW-1 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 /> Wells MW-4A,MW-4B,MW-5A,MIN-513,MW-6A,and MW-6B surveyed on January 8,2000 by Virgil Chavez Land Surveying of Vallejo,CA. <br /> Revised survey data for wells EW--I 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 />