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WELL CONCENTRATIONS <br /> Shell-branded Service Station w <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 B T E X 8020 8260 TOC Water Elevation Reading <br /> (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L (ug/L MSL ft MSL ppm <br /> MW-3 01/1512002 <50 <0 50 <0 50 <0 50 <0 50 NA <5 0 3.534 2120 1414 3 0 <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, except where noted <br /> BTEX= Benzene, toluene,ethylbenzene,xylenes by EPA Method 8260B, 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 8260B on January 23,2001 <br /> For the April 26, 2001, event, Sequoia's courier mistakenly took samples which were intended for Kiff Analytical <br /> Page 3 <br /> i <br /> i <br />