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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton,CA <br /> MTBE MTBE Depth to GW SPH DO <br /> FWell Date TPPH B T E X 8020 8260 DIPE ETRE TAME TBA 1,2-DCA EDB Ethanol Methanol TOC Water Elevation Thickness Reading <br /> (ug/L.) u L u !L u L u !L u u u L u lL u !L u IL u !L u u IL u !L MSL R MSL ft m <br /> Moles <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 anatyzed by EPA Method 9020 <br /> d=Insufficient water to record measurement <br /> e=Top of casing elevation altered dunng wellhead maintenance <br /> r=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 concentrabon reported reflects individual or discrete unidentified peaks not matching a typical fuel pattern <br /> 1=Quantity of unknown hydrocarbon(s)an sample based on gasoline <br /> '=Field data sheets for this event misplaced no field measurements available for[his event <br /> =MTBE confirmed Benzene did not confirm by GUMS <br /> Ethanol and Methanol analyzed by EPA Method 62608 <br /> When separate-phase hydrocarbons are present ground water elevation is adjusted using the relation Corrected ground water elevation=Top-0r-casing elevation depth to water*(0 a x hydrocarbon thickness) <br /> I <br /> Page 19 <br />