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0 <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-4 <br /> Sample Type:Air <br /> Sampling Date 10/1/03 2/11/04 5/6/04 7/22/04 11/15/04 2/14/05 - <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) NR 0 0 0 0 0 <br /> Volatile Organic ComQgUndS PPB(X <br /> _Benzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Benzyl Chloride <1.0 <11.0 <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 6.0 <0.5 <0.5 <0.5 <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 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Dichlorodifluoromethane 92 277 329 649 145 361 <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 <1.0 <1.0 <br /> 1,2-Dichloro-1,1,2,2-Tetrafluoroethane <0.5 23 34 96 15 33 <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-Dichloropropene <0.5 <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 <0.5 <br /> Ethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Hexachlorobutadiene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> _Methylene Chloride <1.0 2.5 <1.0 <1.0 <1.0 <1.0 <br /> Styrene <0.5 <0.5 <0.5 <0.5 <0.5 8.4 <br /> 1,1,2-Trichloro-1,2,2-Trifluoroethane 2.6 8.2 16 29 4.3 9.2 <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Tetrachloroethene(PCE) <0.5 1.5 2.7 3.3 2.3 <0.5 <br /> _ Toluene 27 35 110 <0.5 254 8.4 <br /> _1,2,4-Trichlorobenzene <1.0 0.9* <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 41 123 174 225 61 137 <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 1.6 <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 1.0 <0.5 <0.5 1.0 <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 />