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WELL CON&TRATIONS <br /> Shell-branded Service Station <br /> 141 North EI Dorado <br /> Stockton, CA <br /> Wic #204-7524-1509 <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness DO Reading <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug1L) (ug/L) (MSL) (ft.) (MSL) (ft.) (ppm) <br /> Abbreviations: Notes: <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 '=MTBE could not be determined due to coelution with t-1,2-DCE. <br /> j BTEX= benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 a= MTBE could not be determined due to coeluting compounds <br /> MTBE=methyl-tertiary-butyl ether <br /> j TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> ug/L=parts per billion <br /> msl= Mean sea level <br /> ft=Feet <br /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br /> Page 13 <br />