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WELL C0•TRATIONS • - <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue _ <br /> Stockton, CA <br /> apt to SPH <br /> Well ID Date TPPH 8 T E X 8020 8260 DIPE ETBE TAME TBA Ethanol Methanol 1,2-DCA EDS TOC Water Elevation Thickness <br /> u L u L u L u u u L u (ug/L u u u u L u u L u L MSL ft MSL ft <br /> Abbreviations <br /> TPPH-Total petroleum hydrocarbons as gasoline by EPA Method 82606,prior to May 11 2001,analyzed by EPA Method 8015 <br /> TEPH=Total petroleum hydrocarbons as diesel by moddied EPA Method 8015 <br /> BTEX=Benzene,toluene ethylbenzene,xylenes by EPA Method 82608,prior to May 11,2001,analyzed by EPA Method 8020 <br /> MTBE-Methyl-tertiary-butyl ether <br /> DIPE=Di-Isopropyl ether <br /> ETRE=Ethyl terbary butyl ether <br /> TAME=Tertiary amyl methyl ether <br /> 1,2-DCA=1 2-Dlchtoroethane <br /> EDB=Ethylene dibromlde <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 /> NA=Not Applicable <br /> Notes <br /> "=Chromatogram pattern indicates an unidentified hydrocarbon <br /> a=Analyzed outside of EPA recommended hold time <br /> b=The TPPH values for these samples are primarily caused by the presence of chlorinated compounds <br /> c=Survey date <br /> d=Based on historical data,the samples for MW-6 and MW-7 appear to have been switched <br /> e=The reported value Is primarily due to the presence of Tetrachloroethene <br /> f=Tap of casing elevation altered during wellhead maintenance <br /> g=Hydrocarbon does not match pattern of laboratory's standard <br /> Dissolved Oxygen readings given prior to well purging. <br /> Site surveyed November 30,2001,and September 20,2002,by Virgil Chavez land Surveying of Vallejo California <br /> Top-d-casing measurements prior to December 7,2001,are measured to arbitrary Site Datum <br /> Wells MW-12 and MW-13 surveyed March 5,2004,by Virgil Chavez Land Surveying of Vallejo Caldomia <br /> Page 11 <br />