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WELL CANTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth fo GW SPH DO <br /> Well 1D Date TPPH B T E X 8020 8260 DIPS ETBE TAME TBA 4,2-DCA EDB Ethanol Methanol' TOC Water Elevation Thickness Reading <br /> u IL u IL u !L (ug/1-11 u 1L u !L u 1I u !L u 1L . u !L u 1L u !L u !L u Il u 1L MSL fi MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B,prior to November 21,2000,analyzed by EPA Method 8015 except where noted <br /> BTEX=Benzene,toluene ethylbenzene xylenes by EPA Method 8260B prior to November 21 2000,analyzed by EPA Method 8020 except where noted <br /> MTBE=Methyl tertiary butyl ether <br /> DIPS=Di isopropyl ether,analyzed by EPA Method 82608 <br /> ETBE=Ethyl tertiary butyl ether analyzed by EPA Method 8260B <br /> TAME =Tertiary amyl methyl ether analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol or tertiary butanol analyzed by EPA Method 82608 <br /> t 2-DCA=1 2-Dichloroethane analyzed by EPA Method 82608 <br /> EDB=Ethylene dibromsde analyzed by EPA Method 8260B <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> uglL=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> ft =Feet <br /> <n=Below detection limit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> nln=Pre-purgelPost-purge <br /> Notes <br /> I <br /> a=Analysis was run past recommended hold time <br /> b=Resutt was generated out of hold time <br /> c=TPPH analyzed by modified EPA Method 8015 and BTEX analyzed by EPA Method 8020 <br /> d=Insufficient water to record measurement <br /> e=Top of casing elevation altered during wellhead maintenance <br /> f=Site wells surveyed to mean sea level on February 20,2002 by Virgil Chavez Land Surveying of Vallejo,CA Previous elevations referenced to site datum <br /> g=Hydrocarbon reported does not match the pattern of the laboratory's standard <br /> h=The concentration reported reflects individual or discrete unidentified peaks not matching a typical fuel pattern <br /> =Field data sheets for this event misplaced, no field measurements avadable for this event <br /> •'=MTBE confirmed,Benzene did not confirm by GC/MS <br /> Ethanol and Methanol analyzed by EPA Method 8260E <br /> When separate-phase hydrocarbons are present ground water elevation is adjusted using the relation Corrected ground water elevation=Tap-of-casing elevation depth to water+(0 8 x hydrocarbon thickness) <br /> I <br /> Page 18 <br />