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WELL CONCENTRATIONS <br /> ShellL branded Service Station <br /> 4315 Waterloo Road <br /> Stockton, California <br /> 1 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 1L u !L u SIL l u IL (u2/L) u IL MSL ft ft MSL ftm <br /> r, II 11 <br /> MW-4 11/14/2001 NA NA NA NA NA NA NA NA 3162 6537 NA -3375 NA NA <br /> MW-4 11/1612001 89 NA <0 50 <0 50 <0150 32 NA <0 50 3162 6180 NA -3018 NA NA <br /> MW-4 01/23/2002 <50 NA <0 50 <0 50 <0150 I <0 50 NA 056 31 62 6244 NA -3082 NA NA <br /> MW-4 04/18/2002 <50 NA <0 50 1 <0 50 <0150 <0 50 NA 083 3162 6139 NA -2977 NA NA <br /> MW-4 07/31/2002 <50 NA <0 50 <0 50 <0150 1 <0 54 NA <0 50 3162 6758 NA -3596 NA NA <br /> Abbreviations <br /> r I <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to July 23,2001, analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8045 <br /> BTEX= Benzene,toluene,ethylbenzene,xylenes by EPA Method 826 prior prior to July 23,2001,analyzed by EPA Method 8020 <br /> MTBE=Methyl-tertiary-butyl ether 1 <br /> TOC=Top of Casing Elevation ' <br /> SPH =Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen i I <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit � - <br /> NA=Not applicable <br /> Notes <br /> Site surveyed December 20,2001, by Virgil Chavez Land Surveying of Vallejo, California <br /> 1 u <br /> 'E s <br />