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HISTORICAL SUMMAIM ANALYTICAL RESULTS <br /> UNSATURAIWONE SOIL GAS <br /> CORRAL HOLLOW LANDFILL <br /> GW-5D <br /> Sample Type:Air <br /> Sampling Date 6/20/06 11/14/06 4/13/07 <br /> Monitorina and Field Parameters <br /> Methane Concentration(percent) 0.0 0.0 0.0 <br /> Carbon Dioxide(percent) NT NT 1.2 <br /> V latile Organic Compounds PPB(v/v) <br /> Acetone NT NT NT <br /> Benzene ND ND NT <br /> 1,3-Butadiene ND ND NT <br /> 2-butanone ND ND NT <br /> Carbon Disulfide ND ND NT <br /> Carbon Tetrachloride ND ND NT <br /> Chlorobenzene ND NO NT -- <br /> Chloroethane ND ND NT — <br /> 2-chloroethyi vinyl ether ND ND NT <br /> Chloroform ND ND NT <br /> 1,4-Dichlorobenzene ND ND NT _ <br /> Dichlorodifluoromethane 1100 800 NT <br /> 1,1-Dichloroethane ND ND NT <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroethane ND 48 NT <br /> cis-1,2-Dichioroethene ND ND NT <br /> trans-1,2-dichloroethene ND ND NT <br /> Ethylbenzene ND ND NT <br /> Freon 113 ND ND NT <br /> Methylene Chloride ND ND NT <br /> 2-Propanol ND ND NT <br /> Styrene ND ND NT <br /> 1,1,2-Trichloro-1,2,2-Trtfluoroethane ND ND NT <br /> _Tetrachloroethene(PCE) 540 380 NT <br /> Tetrahydrofuran ND ND NT <br /> Toluene ND ND NT <br /> 1,1,1-Trichloroethane ND ND NT <br /> Trichloroethene ND ND NT <br /> Trichlorofluoromethane 1600 1400 NT <br /> 1,3,5-Trimethylbenzene ND ND NT <br /> 1,2,4-Trimethylbenzene ND ND NT <br /> Vinyl Chloride ND ND NT <br /> m/p Xylene ND ND NT <br /> o-Xylene ND ND NT <br /> NR=Not Required <br /> NT=Not Tested <br /> Only parameters detected in one or more samples are listed. <br /> `=Trace Concentration <br /> (1) Parameter also detected in one or more quality control blanks. <br /> GW-51);Printed:7/19/2007 14 of 21 <br />