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M = M M M ® ® M ® = = ® ® ® = = M <br /> HISTORICAL SUMMARY OF ANALYI <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-9 <br /> Sample Type:Air <br /> Sampling Date 1/23/09 7/15/09 3/2/10 9/3/10 1/25/11 7/29/11 4/12/12 8/7/12 1/28/13 9/11/13 3/18/14 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 0 0 0 0 0 0 0 0 0 0.1 0 <br /> Carbon Dioxide(percent) 0.4 0.2 0.8 0.3 0.4 0.5 0.5 0.4 0.4 0.4 0.4 <br /> Oxygen (percent) 20 20 20.1 20.4 18.9 18 20 19.7 20 20.9 19.9 <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 5.4 <br /> Freon 114 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Chloromethane <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <7.8 <3.3 <10 <12 <7.6 <br /> Vinyl Chloride <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,3-Butadiene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Bromomethane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <7.8 <8.2 <10 <12 <19 <br /> Chloroethane <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 <3.1 <3.3 <4.2 <4.8 <7.6 <br /> Freon 11 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Ethanol 30 <4.5 13 <4.3 15 32 <3.1 <3.3 <4.2 81 <7.6 <br /> Freon 113 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,1-Dichloroethene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Acetone 7 6.1 6 10 <4.3 11 <7.8 <8.2 <10 <12 <19 <br /> 2-Propanol <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 <4.2 <4.8 <7.6 <br /> Carbon Disulfide <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 <3.1 <3.3 <4.2 <4.8 <7.6 <br /> 3-Chloropropene <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 <4.2 <4.8 <7.6 <br /> Methylene Chloride <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <7.8 <8.2 <10 <12 <19 <br /> Methyl tert-butyl ether <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> trans-1,2-Dichloroethene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Hexane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,1-Dichloroethane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 2-Butanone(Methyl Ethyl Ketone) <1.1 <1.1 1.4 1.6 1.2 <4.3 <3.1 <3.3 <4.2 <4.8 <7.6 <br /> cis-1,2-Dichloroethene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Tetrahydrofuran <1.1 <1.1 2.5 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Chloroform <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,1,1-Trichloroethane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Cyclohexane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Carbon Tetrachloride <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 2,2,4-Trimethylpentane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Benzene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,2-Dichloroethane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Heptane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> Trichloroethene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,2-Dichloropropane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> 1,4-Dioxane <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 <4.2 <4.8 <7.6 <br /> Bromodichloromethane <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br /> cis-1,3-Dichloropropene <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <1.9 <br />