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i • • <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton,CA <br /> MTBE BE Depth to OW SPH DO <br /> Fw,, <br /> IIID Date TPPH B T E X 8020 8260 DIPS ETRE TAME TBA '1,2-DCA EDB ethanol Methanol TOC Wafer Elevation Thickness Reading <br /> Wall u u IL u !L u L u !L u u R. u 1L (uSIL) u u ll u u !L u L MSL ft MSL ft m <br /> Notes <br /> a=Analysls was run past recommended hold bme <br /> b=Result was generated out of hold bme <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 elevatmn 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 ft 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 hydrocarbon(s)in sample based on gasoline <br /> J=Analyle was detected at a concentration below the reporting limit and above the laboratory method detection limit. Reported value is estimated <br /> ' <br /> =Field data sheets for this event misplaced no field measurements available for this event <br /> "=MTBE confirmed Benzene did not confirm by GC/MS <br /> Ethanol and Methanol analyzed by EPA Method 82608 <br /> When saparat"hase hydrocarbons are present,ground water elevation is adjusted using the relation Corrected ground water elevation=Top-or-casing elevation-depth to water+(0 6 x hydrocarbon thickness) <br /> Page 20 <br />