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HISTORICAL SUMMAWF ANALYTICAL RESULTS <br /> UNSATU ZONE SOIL GAS <br /> FOOTHILLIWTARY LANDFILL <br /> SG-T <br /> Sample Type:Air <br /> Sampling Date 2/19/04 5/6/04 7/22/04 11/15/04 2/11/05 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 0 0 2.1 0 0.4 <br /> Volatile Organic Compounds PPB(v/v) <br /> Benzene 73 <0.5 1.8 <0.5 <0.5 <br /> Benzyl Chloride <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Bromomethane 2.6 <0.5 <0.5 <0.5 <0.5 <br /> Carbon Tetrachloride 1.7 <0.5 <0.5 <0.5 <0.5 <br /> Chlorobenzene <0.5 <0.5 3.9 <0.5 <0.5 <br /> _Chloroethane 2.5 <0.5 <0.5 <0.5 <0.5 <br /> Chloroform 1.8 <0.5 <0.5 <0.5 <0.5 <br /> _ Chloromethane 3.3 1.0 43 0.9 <0.5 <br /> 1,2-Dibromoethane <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichlorobenzene 1.7 <0.5 <0.5 <0.5 <0.5 <br /> 1,3-Dichlorobenzene 1.7 <0.5 <0.5 <0.5 <0.5 <br /> 1,4-Dichlorobenzene 1.8 <0.5 <0.5 <0.5 <0.5 <br /> Dichlorodifluoromethane 9.9 <0.5 2588 5.3 2457 <br /> 1,1-Dichloroethane 1.7 <0.5 1.1 <0.5 9.1 <br /> 1,2-Dichloroethane <1.0 <0.5 <0.5 <0.5 <1.0 <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroethane 3.0 <0.5 247 <0.5 186 <br /> 1,1-Dichloroethylene 1.8 <0.5 2.8 <0.5 <0.5 <br /> cis-1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichloropropane 1.9 <0.5 <0.5 <0.5 <0.5 _ <br /> cis 1 3-Dichloropropene <0.5 <0.5. <0.5 <0.5 <0.5 <br /> trans-1,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Ethylbenzene 3.1 <0.5 <0.5 <0.5 <0.5 <br /> Hexachlorobutadiene 2.2 <1.0 1.2 <1.0 <1.0 <br /> Methylene Chloride 16 39.0 3.9 <1.0 8.7 <br /> Serene <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1,2-Trichloro-1,2,2-Trifluoroethane 2.1 <0.5 191.0 0.9 238 <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Tetrachloroe_thene(PGE) 1.7 <0.5 32 16 82 <br /> Toluene 3.5 3.4 <0.5 2.1 <0.5 <br /> 1,2,4-Trichlorobenzene 2.8 <1.0 <1.0 <1.0 <1.0 <br /> 1,1,2-Trichloroethane <0.5 <0.5 1.0 <0.5 <0.5 <br /> 1,1,1-Trichloroethane 1.8 <0.5 47 2.7 169 <br /> Trichloroethene 1.8 <1.0 4.7 1.1 23 <br /> Trichlorofluoromethane 3.4 0.9 1483 18 2939 <br /> 1,3,5-Trimethylbenzene 1.8 <0.5 <0.5 <0.5 <0.5 <br /> 1,2,4-Trimethyibenzene 2.2 3.0 <0.5 <0.5 <0.5 <br /> Vinyl Chloride 2.4 <0.5 13 <0.5 <0.5 <br /> m/p Xylene 8.1 1.1 1.1 1.3 <0.5 _ <br /> o.Xylene 4.1 <0.5 <0.5 <0.5 <0.5 <br /> NR=Not Required <br /> NT=Not Tested <br /> Trace Concentration <br /> (1) Parameter also detected in one or more quality control blanks. <br /> SG-T;Printed;7/21/2005 15 of 15 <br />