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M w M M M MM w M M w M w M w Mao HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG-5 Sample Type:Air Sampling Date 8/7/12 1/28/13 9/11/13 3/18/14 Monitoring and Field Parameters Methane Concentration(percent) 0 0 0 0 Carbon Dioxide(percent) 0.5 0.7 0.7 0.6 Oxygen(percent) 19.8 19.6 19.6-20.8 Volatile Organic Compounds PPB(v/v) Freon 12 1.2 <1.1 <1.1 2.8 Freon 114 <0.86 <1.1 <1.1 <1.2 Chloromethane <3.4 <11 <11 <4.6 Vinyl Chloride <0.86 <1.1 <1.1 <1.2 1,3-Butadiene <0.86 <1.1 <1.1 <1.2 Bromomethane <8.6 <11 <11 <12 Chloroethane <3.4 <4.4 <4.5 <4.6 Freon 11 <0.86 <1.1 <1.1 1.5 Ethanol <3.4 <4.4 14 <4.6 Freon 113 <0.86 <1.1 <1.1 <1.2 1,1-Dichloroethene <0.86 <1.1 <1.1 <1.2 Acetone <8.6 <11 18 <12 2-Propanol <3.4 <4.4 <4.5 <4.6 Carbon Disulfide <3.4 <4.4 <4.5 <4.6 3-Chloropropene <3.4 <4.4 <4.5 <4.6 Methylene Chloride <8.6 <11 <11 <12 Methyl tert-butyl ether <0.86 <1.1 <1.1 <1.2 trans-1,2-Dichloroethene <0.86 <1.1 <1.1 <1.2 Hexane <0.86 1.1 <1.1 <1.2 1,1-Dichloroethane <0.86 <1.1 <1.1 <1.2 2-Butanone(Methyl Ethyl Ketone) <3.4 <4.4 <4.5 <4.6 cis-1,2-Dichloroethene <0.86 <1.1 <1.1 <1.2 Tetrahydrofuran <0.86 <1.1 <1.1 1.8 Chloroform <0.86 <1.1 <1.1 <1.2 1,1,1-Trichloroethane <0.86 <1.1 <1.1 <1.2 Cyclohexane <0.86 <1.1 <1.1 <1.2 Carbon Tetrachloride <0.86 <1.1 <1.1 <1.2 2,2,4-Trimethylpentane <0.86 <1.1 <1.1 <1.2 Benzene <0.86 <1.1 <1.1 <1.2 1,2-Dichloroethane <0.86 <1.1 <1.1 <1.2 Heptane <0.86 <1.1 <1.1 <1.2 Trichloroethene <0.86 <1.1 <1.1 <1.2 1,2-Dichloropropane <0.86 <1.1 <1.1 <1.2 1,4-Dioxane <3.4 <4.4 <4.5 <4.6 Bromodichloromethane <0.86 <1.1 <1.1 <1.2 cis-1,3-Dichloropropene <0.86 <1.1 <1.1 <1.2 4-Methyl-2-pentanone <0.86 <1.1 <1.1 <1.2