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WELL CONCENTRATIONS <br /> i <br /> ShellLbranded Service Station <br /> 620 West Charter Way <br /> I� Stockton, CA <br /> Wic #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DO <br /> 11 <br /> Well ID Date TPPH B T E X 8020 8280 TOC Water Elevation Thickness Reading <br /> I (ug/L) (ug/L} (ug/L) (ug/L) (ug/L) (ug/L) (ua/L) (MSL) (ft) (MSL) (ft) (ppm) <br /> MW-10 108118119991 <50 0 1 <0 500 1 <0 500 1 <0 500 1 1�<0 500 1 <5 00 NA 1 8837 1843 69194 NA 1 4 <br /> M*10" I 111051'I999 _-,<50 0)� <0"500 '<0 50040<0,600, '01W-600,11, 2 50 [ A 88,-37* V08,96 M1fA_� x;2114 <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene, xylenes by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> DO= Dissolved Oxygen <br /> ug/L=parts per billion <br /> ms] =Mean sea level <br /> ft=Feet <br /> <n =Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <br /> n/n=Pre-purge/Post-purge <br /> Notes <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 /> a=Analysis was run past recommended hold time <br /> When separate-phase hydrocarbons are present, ground water elevation is adjusted using the relation <br /> Corrected ground water elevation=Top-of-casing elevation-depth to water+(0 8 x hydrocarbon thickness) <br /> Page 18 <br />