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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> MTBE MTBE Depth toTEl,)G=Ion <br /> SPH DO <br /> WeIIID Date TPPH 7BT E X 8020 8260 D1PE ET8E TAME TBA 1,2-DCA EDB Ethanol Methanol TOC Water Thickness Reading <br /> u L L u u !L u u u L u L u u 1l u IL u IL I—MIL) u R MSL ft MSL ft m <br /> AbWavlations <br /> TPPH=Total petroleum hydrocarbons as gasotina by EPA Method 82608,prior to November 21,2000 analyzed by EPA Method 8015,except where noted <br /> STEX=Benzene toluene,ethylbenzene,xytenes by EPA Method 82606 prior to November 21,2000,analyzed by EPA Method 8020 except where noted <br /> MTBE=Methyl tertiary butyl ether <br /> DIPE=DI Isopropyl ether,analyzed by EPA Method 8260B <br /> ETRE=Ethyl tertiary butyl ether,analyzed by EPA Method 82606 <br /> TAME =Tertiary amyl melhyl ether analyzed by EPA Method 8260B <br /> TBA=Tertiary butyl alcohol or tertiary butanol,analyzed by EPA Method 8260B <br /> 1,2-DCA=i 2-1)tchloroethane,analyzed by EPA Method 82608 <br /> EDS=Ethylene dibromide,analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO=Dissolved Oxygen <br /> uglL a Parts per billion <br /> ppm=Parts per mllfion <br /> M5L=Mean sea level <br /> ft =Feel <br /> <n=8olow detection Ilmit <br /> (D)=Duplicate sample <br /> NA=Not applicable <br /> nln=Pre-purge/Post purge <br /> Notes <br /> a Analysis was run past recommended hold time <br /> b=Result 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 easing 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 /> I=Quantity of unknown hydrocarbons)in sample based on gasoline <br /> '=Field data shears for this event misplaced, no field measurements available for this event <br /> ••=MTBE confirmed,Benzene did not confirm by GCIMS <br /> Ethanol and Methanol analyzed by EPA Method 8260B <br /> When separate-phase hydrocarbons are present ground water elevation is adjusted using the relation Corrected ground water elevation=Top-of Casing elevation-depth to water+(0 8 x hydrocarbon thickness) <br /> Page 19 <br /> t. <br /> ti <br />