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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> MTBE MTBE Depth to GW SPH <br /> Wel! ID Date TPPH B T E X 8020 8260 TQC Water Elevation Thickness <br /> u IL u IL u 1L u IL (Ug/L (ug/L u IL MSL ftMSL ft <br /> MW-3 08/08/2002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 1231 3846 -2615 NA <br /> MW-3 10/3012002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 1231 3965 -2734 NA <br /> MW-3 02/21/2003 <50 050 <0 50 <0 50 11 NA <5 0 1231 3561 -2330 NA <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 82608,prior to May 11,2001,analyzed by EPA Method 6020 <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 /> 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 MWA 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 /> "= 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 /> Site surveyed January 14,2002, by Virgil Chavez Land Surveying of Vallejo, California <br /> Page 7 <br />