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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> MTBE MTBEDepth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC) <br /> OC Water Elevation Thickness <br /> u /L u IL u IL u !L u 1L u IL u IL MSL ft MSL ft <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to May 11,2001, analyzed by EPA Method 8015 <br /> BTEX=Benzene,toluene, ethylbenzene,xylenes by EPA Method 82606, pnor to May 11,2001,analyzed 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 /> uglL= 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 /> 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 /> e=Site wells surveyed to mean sea level on January 14,2002, by Virgil Chavez Land Surveying of Vallejo, California Previous elevations referenced to site datum <br /> w=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 /> Site surveyed January 14,2002, by Virgil Chavez Land Surveying of Vallejo, California <br /> I <br /> R 8 • <br />