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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> Wic #204-7524-4305 <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> (ug/L (u/L u /L u IL u l u IL (u/L MSL ft MSL ft m <br /> MW-10 05/19/1997 <50 <0 5 <0 5 <0 5 <0 5 <10 NA 8837 2179 6658 000 44 <br /> MW-10 08/21/1997 <50 <0 5 <0 5 <0 5 <0 5 <10 NA 8837 2270 6567 000 1 4 <br /> MW-10 11/17/1997 <50 <0 50 <0 50 <0 50 <0 50 NA 210 8837 2376 6461 000 3 4 <br /> MW-10 02/09/1998 51 13 60 087 28 <3 NA 8837 21 05 6732 000 30 <br /> MW-10 05/21/1998 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 8837 1730 7107 000 26 <br /> I <br /> MW-10 08/11/1998 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 88 37 1752 7085 000 1 8 <br /> MW-10 11/09/1998 <50 39 12 098 056 53 NA 8837 1865 6972 000 23 <br /> MW-10 02/17/1999 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 8837 NA 000 <br /> MW-10 0512611999 <50 0 <0 500 <0,500 <0 500 500 <S.00 NA 88.37 1802 70 35 0.00 1.9 <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 /> msl=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> D=Duplicate sample <br /> Notes <br /> ' <br /> =Field data sheets for this event misplaced, no field measurements available for this event <br /> I <br /> Page 16 <br />