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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-3 <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 Compounds PPB(v/v) <br /> Benzene <0.5 0.8 <0.5 <0.5 <0,5 <0.5 <br /> Benzyl Chloride 1.4* <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 33 24 <0.5 <br /> 1,2-Dibromoethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,2-Dichlorobenzene 0.9 <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 0.9 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Dichlorodifluoromethane 25 454 309 610 258 746 <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 2.8 47 40 106 47 80 <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 1.4* <1.0 <1.0 <1.0 <1.0 <1.0 <br /> Methylene Chloride 1.0* 3.2 <1.0 <1.0 <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 1.1 12 14 22 9.1 13 <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> Tetrachloroethene(PCE) <0.5 9.0 23 26 20 8.4 <br /> Toluene 6.6 24 219 <0.5 274 11 <br /> 1,2,4-Trichlorobenzene 1.7 <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 4.2 3.0 5.6 1.3 5 <br /> Trichloroethene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> _ Trichlorofluoromethane 22 394 338 386 184 533 <br /> 1 3 5-Trimethylbenzene 0.9 <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 1.1 1.2 <0.5 <0.5 <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 />