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WELL CONCITRATIONS - <br /> Shell-branded Service Station <br /> 341 East Main Street - <br /> Ripon, CA <br /> Wic #204-6522-0307 <br /> Depth ! <br /> MTBE MTBE i j to Depth GW ' SPH JDOWell ID Date TPPH TEPH B T E X 8020 8260 TOC I Water ' to SPH Elevation Thickness Reu IL ug/L u IL ug/L u !L (ug/L u IL) (ug/L (MSL) I (ft.) (ft.) I MSL) l (ft.) <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82606; 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,E!thylbenzene,xylenes by EPA Method 8260B; prior to July 10, 2001, analyzed by EPA Method 8020. <br /> MTBE=methyktertiary-but}'l ether <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 /> msi= Mean sea level <br /> ft= Feet <br /> <n= Below detection limit <br /> NA= Not applicable <br /> Notes: <br /> a= D.O.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 /> *MTBE by EPA Method 8260 omitted due to lab error. <br /> `*Sample was analyzed past EPA recommended holding time. <br /> ***MTBE by 8260 for well h1W-1 inadvertently not run for July 9, 1999 event. <br /> Survey of wells performed on March 25, 1999 by Virgil Chavez Land Surveying of Vallejo, CA. <br /> Wells MW-4A, MW-4B, MVI-5A, MW-513, MW-6A and MW-613 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 /> I <br /> Page 9 <br />