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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 MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> (ug/L uIL u IL u IL (ug/L u IL (ug/L SD ftSD ft <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82608, prior to May 11,2009 analyzed by EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene,xylenes by EPA Method 82606,prior to May 11,2001,analyzed by EPA Method 8020 <br /> MTBE =methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPM= Separate-Phase Hydrocarbons <br /> GW= Groundwater <br /> ug/L= parts per billion <br /> sd= site datum <br /> ft= Feet <br /> <n = Below detection limit <br /> D = Duplicate sample <br /> NA= Not applicable <br /> Notes <br /> a =Change in elevation of MW-2 on August 26, 1993 due to well head repairs <br /> b=Change in elevation of MW-1 on February 2,2000 due to well head repairs <br /> c= Concentration reported is an estimate value above the linear quantitation <br /> d=This sample analyzed outside of EPA recommended hold time <br /> = Laboratory(NET, Inc)reported persistent toluene and xylene in laboratory supplied trip blanks and nnse water Equipment blank <br /> and laboratory method blank contained toluene(0 0007 and 0 00034, respectively)and xylenes(BDL and 0 00048, respectively) <br /> Page 7 <br />