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WELL.CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton,CA <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 82fi0 DIPS ETRE TAME TBA 1,2-DCA EDB Ethanol Methanol TOC Water Elevation Thickness Reading <br /> u AL u L u 1. u IL u IL u u 1L u u u (L u L u L Juall. u u IL MSL ft MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82608,prior lo November 21,2000 analyzed by EPA Method 8015,except where noted <br /> BTEX=Benzene,toluene ethylbenzene,xylenes by EPA Method 82608,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 82608 <br /> ETBE=Ethyl tertlary butyl ether analyzed by EPA Method 82606 <br /> TAME =Tertiary amyl methyl ether,analyzed by EPA Method 82608 <br /> TBA=Tertiary butyl alcohol or tarbary butanol analyzed by EPA Method 82608 <br /> 1,2 DCA=1,2 Dichioroelhane,analyzed by EPA Method 82608 <br /> EDB=Ethylene dibromide,analyzed by FPA Method 8260E <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> 00=Dissolved Oxygen <br /> uglL=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level <br /> it =Feel: <br /> <n=Below detection limit <br /> (D)=Dupllcafe sample <br /> NA=Not applicable <br /> nln=Pre purgelPosl-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 casing elevation altered during wellhead malntenanos <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 laboraloryrs standard <br /> h=The concentration reported reflects individual or drsaele unidentified peaks not matching a typical fuel pattern <br /> I=Quantity of unknown hydrocarbon(s)In sample basad on gasoline <br /> =Fleld Bala sheets for this evenl misplaced, no Field measurements available for this event. <br /> •'=MTBE confirmed Benzene did not confirm by GC1MS <br /> Ethanol and Methanol analyzed by EPA Method 82609 <br /> When seperatelAase hydrorarbons are present ground water elevation is adjusted using the relation Corrected ground water elevation a Top-of-casing elevation-depth to water+(0 8 x hydrocarbon thickness) <br /> Page 18 <br />