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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-6 <br /> Sample Type:Air <br /> Sampling Date 10/1/03 2/11/04 5/6/04 7/22/04 11/15/04 2/11/05 <br /> Monitorina and Field Parameters <br /> Methane Concentration(percent) NR 0 0 0 0 0 <br /> Volatile Organic Compounds PPB(v/v) <br /> _Benzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Benzyl Chloride <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Bromomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Chlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> _ Chloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Chloroform <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Chloromethane <0.5 <0.5 <0.5 1.0 <0.5 <0.5 <br /> 1,2-Dibromoethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,4-Dichlorobenzene 0.8 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Dichlorodifluoromethane 4.4 266 179 345 265 416 <br /> 1,1-Dichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <1.0 <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroethane <0.5 13 9.8 19 15 21 <br /> 1,1-Dichloroethylene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> cis-1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichloropropane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> cis-1,3-Dichioropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> trans-l,3-Dichloropropene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Ethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Hexachlorobutadiene 1.1* <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Methylene Chloride 1.5* 6.9 <1.0 8.8 <1.0 <1.0 <br /> Styrene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1,2-Trichloro-1,2,2-Trifluoroethane <0.5 7.8 7.0 10.6 7.5 11 <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Tetrachloroethene(PCE) <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Toluene 2.6 29 83 1.0 153 388 <br /> 1,2,4-Trichlorobenzene 1.3* <1.0 <1.0 <1.0 <1.0 <1.0 <br /> 1,1,2-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1,1-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Trichloroethene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Trichlorofluoromethane 1.8 89 94 107 81 130 <br /> 1,3,5-Trimethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2,4-Trimethylbenzene <0.5 <0.5 1.8 <0.5 <0.5 <0.5 <br /> Vinyl Chloride <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> m/p Xylene <0.5 0.9 <0.5 1.3 <0.5 <0.5 <br /> o-Xylene <0.5 <0.5 <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 />