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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 1071 North Main Street <br /> Manteca, CA <br /> Wlc #204-4728-0502 <br /> MTBE MTBE Depth to GW D O <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Reading <br /> u IL u IL u IL u IL u IL u IL u IL MSL ft MSL {ppm} <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82608, prior to July 11,2001, analyzed by EPA Method 8015,except where noted <br /> BTEX=benzene,toluene, ethylbenzene, xylenes by EPA Method 82606, prior to July 11, 2001, analyzed by EPA Method 8020, except where noted <br /> MTBE= methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> GW=Groundwater <br /> ug/L=parts per billion <br /> ppm= parts 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 82606 on January 23,2001 <br /> For April 26,2001 event, Sequoia's courier mistakenly took samples which were intended for Kiff Analytical <br /> 1 <br /> i <br /> Page 3 <br />