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• � i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 1071 North Main Street <br /> Manteca, CA <br /> Wic #204-4728-0502 <br /> MTBE MTBE Depth to GW D.O <br /> Well ID Date TPPH BT E X 8020 8260 TOC Water Elevation Reading <br /> (ug/L) (ug/L) (uglL) (ug/L) (ug/L) (ug/L) (ug/L) (MSL) (ft) (MSL) (ppm) <br /> i <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B, prior to July 11, 2001,analyzed by EPA Method 8015 <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B, prior to July 11,2001,analyzed by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> ug/L=parts per billion <br /> ppm=parks per million <br /> msl=Mean sea level <br /> ft= Feet <br /> <n=Below detection limit <br /> D=Duplicate sample <br /> Notes <br /> a=Sample re-analyzed past hold time, results should be considered estimates <br /> TPPH and BTEX analyzed by EPA Method 8260B on January 23,2001 <br /> For April 26,2001 event, Sequoia's courier mistakenly took samples which were intended for KEff Analytical <br /> i <br /> Page 3 <br />