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I 'I <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, CA <br /> Wic #204-6522-0307 <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u IL u /L u /L u /L u /L u IL u IL u /L MSL ft I ft MSL ft m <br /> I , <br /> EW-2 7128199 1D$ NA I 9 79 I s, 15'1 5 09 11 9 ,31 5 I 30 6 64 iD 3D 40 NA I w33 70 I NA 2,1 <br /> n <br /> i <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug1L=parts per billion <br /> msl=Mean sea level <br /> ft=Feet <br /> an=Below detection limit <br /> NA=Not applicable <br /> Notes <br /> ' MTBE by EPA Method 8260 omitted due to lab error <br /> **Analysis run out of recommended hold time due to lab error <br /> Survey of wells performed on March 25, 1999 by Virgil Chavez Land Surveying of Vallejo,CA <br /> *** MTBE by 8260 for well MW-1 inadvertently not run for July 9, 1999 event <br /> Page 4 <br /> 1 <br />