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MM M MM M <br /> ® HISTORICAL SUMMAANALYTICAL RESULTS <br /> UNS RAISNE SOIL GAS <br /> CORRAL HOLLOW LANDFILL <br /> GW-3D <br /> Sample Type:Air <br /> Sampling Date 6/20/06 11/14/06 2/26/07 4/13/07 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 0.0 0.0 0.0 0.0 <br /> Carbon Dioxide(percent) NT NT 4.5 2.2 <br /> Volatile Organic Compounds PPB(v/v) <br /> Acetone NT NT ND ND <br /> Benzene ND NO ND ND <br /> 1,3-Butadiene ND ND ND ND <br /> 2-butanone ND ND NO ND <br /> Carbon Disulfide ND ND ND ND <br /> Carbon Tetrachloride ND ND ND ND <br /> Chlorobenzene NO ND ND NO <br /> Chloroethane ND ND ND NO <br /> 2-chloroethyl vinyl ether NO ND ND ND <br /> Chloroform 40 52 13 25 <br /> 1,4-Dichlorobenzene ND ND NO ND <br /> Dichlorodifluoromethane 7.4 10 980 100 <br /> 1,1-Dichloroethane 34 33 920 130 <br /> 1,2-Dichioro-1,1,2,2-Tetrafluoroethane NO ND 38 260 <br /> cis-1,2-Dichloroethene 62 82 8.6 53 <br /> trans-1,2-dichloroethene ND ND NO 4.7 <br /> Ethylbenzene ND ND NO ND <br /> Freon 113 ND ND ND ND <br /> Methylene Chloride 9.5 9.8 22 20 <br /> 2-Propanol NO ND 250 900 <br /> Styrene NO ND ND ND <br /> 1,1,2-Trichloro-1,2,2-Trifluoroethane ND ND 12 ND <br /> Tetrachloroethene(PCE) 430 550 300 420 <br /> Tetrahydrofuran ND ND ND 5.5 <br /> Toluene ND ND ND NO <br /> 1,1,1-Trichloroethane ND NO 5 ND <br /> Trichloroethene 150 210 69 130 <br /> Trichlorofluoromethane 32 42 1300 ND <br /> 1,3,5-Trimethylbenzene NO ND NO ND <br /> 1,2,4-Trimethylbenzene NO ND NO ND <br /> Vinyl Chloride 2.5 3.5 ND ND <br /> m/p Xylene ND ND ND ND <br /> o-Xylene ND ND ND ND <br /> NR=Not Required <br /> NT=Not Tested <br /> =Trace Concentration <br /> (1) Parameter also detected in one or more quality control blanks. <br /> GW-3D;Printed:7/19/2007 8 of 21 <br />