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0 <br /> WELL CONCENTRATIONS <br /> Sheli-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 pate TPI TEPH 9J T E X 8020 82fi0 TBA DIPE ETSE TAME DCA EDB Ethanol Methanol TOC Water to SPH Elevation Thickness Reading <br /> u u 1L u lL u L u u u u 1L u u IL u u IL u u u MSL ft. R. M5L ft. m <br /> Notes: <br /> a=DO readings not taken for Cris 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 altured during wellhead maintenance. <br /> e=Hydrocarbon does not match pattern of laboratory's standard. <br /> f=The concentration reported eflects individual or discrete unidentified peaks not matching a typical fuel pattern. <br /> •MTBE by EPA Method 8260 emitted due to lab error. <br /> Sample was analyzed past E PA recommended holding time_ <br /> "•MTBE by 8260 for well MW 4 inadvertently not tun for July 8,1998 event. <br /> Ethanol and Methanol analyzed by EPA Method 82608. <br /> Surrey of wells performed on dlarch 25,1599 by Virgil Chavez Land Surveying of Vallejo,CA. <br /> Wells MWAA,MW46,MW-SE,,MW-59,MW-6A,and MW-66 surveyed on January 8,2000 by Virgil Chavez Land Surveying of Vallejo,CA. <br /> Revised survey data for welts t W-1 and EW-2 provided by Cambria Environmental Technology,Inc.in January.2001. <br /> Site surveyed May 7,2002 by'Jirgil Chavez Land Surveying of Vallejo,CA. <br /> i <br /> I <br /> Page 12 <br />