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M ® s ® M ® ® M ® ® ® ® ® ■u M ® ® M <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-7 <br /> Sample Type:Air <br /> Sampling Date 8/7/12 1/28/13 9/11/13 3/18/14 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 0 0 0.1 0 <br /> Carbon Dioxide(percent) 0.4 0.5 0.5 0.5 <br /> Oxygen (percent) 19.6 20 20.5 20.3 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 74 48 39 67 <br /> Freon 114 2.3 <2.4 <1.0 <2.9 <br /> Chloromethane <6.7 <24 <1-0 <1 1 <br /> Vinyl Chloride <1.7 <2.4 <1.0 <2.9 <br /> 1,3-Butadiene <1.7 <2.4 <1.0 <2.9 <br /> Bromomethane <17 <24 <10 <29 <br /> Chloroethane <6.7 <9.6 <4.2 <11 <br /> Freon 11 74 49 41 78 <br /> Ethanol <6.7 <9.6 <4.2 <11 <br /> Freon 113 1.8 -1.1-1.9 4.2 <br /> 1,1-Dichloroethene <1.7 <2.4 <1.0 <2.9 <br /> Acetone <17 <24 <10 <29 <br /> 2-Propanol <6.7 <9.6 <4.2 <11 <br /> Carbon Disulfide <6.7 <9.6 <4.2 <11 <br /> 3-Chl2ropropene <6.7 <9.6 <4.2 <11 <br /> Methylene Chloride <17 <24 <10 <29 <br /> Methyl tert-butyl ether <1.7 <2.4 <1.0 <2.9 <br /> trans-1,2-Dichloroethene <1.7 <2.4 <1.0 <2.9 <br /> Hexane <1.7 <2.4 <1.0 <2.9 <br /> 1,1-Dichloroethane <1.7 <2.4 <1.0 <2.9 <br /> 2-Butanone(Methyl Ethyl Ketone) <6.7 <9.6 <4.2 <11 <br /> cis-1,2-Dichloroethene <1.7 <2.4 <1.0 <2.9 <br /> Tetrahydrofuran <1.7 <2.4 <1.0 <2.9 <br /> Chloroform <1.7 <2.4 <1.0 <2.9 <br /> 1,1,1-Trichloroethane <1.7 <2.4 <1.0 <2.9 <br /> Cyclohexane <1.7 <2.4 <1.0 <2.9 <br /> Carbon Tetrachloride <1.7 <2.4 <1.0 <2.9 <br /> 2,2,4-Trimethylpentane <1.7 <2.4 <1.0 <2.9 <br /> Benzene <1.7 <2.4 <1.0 <2.9 <br /> 1,2-Dichloroethane <1.7 <2.4 <1.0 <2.9 <br /> Heptane <1.7 <2.4 <1.0 <2.9 <br /> Trichloroethene <1.7 <2.4 <1.0 <2.9 <br /> 1,2-Dichloropropane <1.7 <2.4 <1.0 <2.9 <br /> 1,4-Dioxane <6.7 <9.6 <4.2 <11 <br /> Bromodichloromethane <1.7 <2.4 <1.0 <2.9 <br /> cis-1,3-Dichloropropene <1.7 <2.4 <1.0 <2.9 <br /> 4-Methyl-2-pentanone <1.7 3.5 <1.0 <2.9 <br />