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w s M M r M M M M s r M M M M M M M M <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-5 <br /> Sample Type:Air <br /> Sampling Date 8/20/07 1/29/08 7/29/08 1/22/09 7/15/09 3/2/10 9/3/10 1/25/11 7/29/11 4/12/12 <br /> Monitorinq and Field Parameters <br /> Methane Concentration(percent) 0 0 0 0 0 0 0 0 0 0 <br /> Carbon Dioxide(percent) 2.1 0.7 0.6 0.6 0.5 1 0.4 0.6 0.6 0.7 <br /> Oxygen (percent) 12.4 19.7 19 19.6 18.8 20.2 20.2 18.8 18 19.4 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 1.5 <br /> Freon 114 <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Chloromethane <0.5 <0.5 <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <8.1 <br /> Vinyl Chloride <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,3-Butadiene NT NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Bromomethane <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <8.1 <br /> Chloroethane <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <4.2 <3.2 <br /> Freon 11 <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Ethanol NT NT <4.7 <4.4 <4.7 8.4 <4.6 19 27 <3.2 <br /> Freon 113 <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,1-Dichloroethene <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Acetone 7.7 4.6 19 12 5.9 62 10 <4.7 5.1 <8.1 <br /> 2-Propanol NT NT <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <3.2 <br /> Carbon Disulfide 1.8 1.1 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <4.2 <3.2 <br /> 3-Chloropropene NT NT <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <3.2 <br /> Methylene Chloride <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <8.1 <br /> Methyl tert-butyl ether NT NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> trans-1,2-Dichloroethene NT NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Hexane <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,1-Dichloroethane <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 2-Butanone(Methyl Ethyl Ketone) 10 10 3 3.5 <1.2 13 2 <1.2 <4.2 <3.2 <br /> cis-1,2-Dichloroethene <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Tetrahydrofuran <0.5 180 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Chloroform <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,1,1-Trichloroethane <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Cyclohexane <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Carbon Tetrachloride <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 2,2,4-Trimethylpentane <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Benzene <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,2-Dichloroethane <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Heptane <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> Trichloroethene <1.0 <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,2-Dichloropropane <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 1,4-Dioxane NT NT <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <3.2 <br /> Bromodichloromethane NT NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> cis-1,3-Dichloropropene <0.5 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br /> 4-Methyl-2-pentanone NT NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <br />