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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> Wic #204-7524-0808 <br /> MTBE MTBEDepth to GW SPH <br /> Well 10 Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> (ug/L) (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (MSL) (ft) (MSL) (ft ) <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> STEX= 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 /> ug/L=parts per billion <br /> msl= Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> D= Duplicate sample <br /> Notes <br /> a Change in elevation of MW-2 on 08/26/93 due to well head repairs <br /> *= Laboratory(NET, Inc)reported persistent toluene and xylene in laboratory supplied trip blanks and rinse water Equipment blank <br /> and laboratory method blank contained toluene (0 0007 and 0 00034, respectively)and xylenes (BDL and 0 00048, respectively) <br /> I <br /> d <br /> Page 6 <br /> � s ss <br />