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! WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 4445 North Pershing Avenue <br /> i Stockton, CA <br /> +I Wic #204-7524-2408 <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (MSL) ft (MSL) (ft } <br /> ! VEW-2 08/12/1998 <50 <0 50 <0 50 <0 50 <0 50 50 NA NA 1423 NA 000 <br /> VEW-2 10/28/1998 Insufficient water NA NA NA NA NA NA 1483 NA 000 l <br /> VEW-2 02/111/999 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA NA 1190 NA fl-00 � <br /> I <br /> C I <br /> U , <br /> I , <br /> Abbreviations ii 4 i <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene,xylenes byEPA Method 8020 i <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation r <br /> w SPH =Separate-Phase Hydrocarbons <br /> GW= Groundwater <br /> ug/L= parts per billion <br /> msl = Mean sea level ! s <br /> ft= Feet ! <br /> <n W Below detection limit i l <br /> D = Duplicate sample <br /> I <br /> i <br /> E t <br /> I i i <br /> t I <br /> ! <br /> i <br /> , <br /> E <br /> I l <br /> i i Page 8 <br />