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M s ® ® r r ® s M ® ® ® ® M ® ® M 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 8/20/07 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 9/3/10 1/25/11 7/29/11 4/12/12 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 0 0 0 0 0 0 0 0 0 0 <br /> Carbon Dioxide(percent) 0.3 0.4 0.3 0.4 0.3 0.8 0.4 0.5 0.5 0.6 <br /> Oxygen(percent) 20 19 19 18 18.7 19.6 19.9 18.2 16.5 19.6 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 8 130 79 150 170 110 120 79 47 90 <br /> Freon 114 <0.5 2.7 2.4 3.4 3.9 2.8 3.2 2.2 <2.0 2.6 <br /> Chloromethane <0.5 <0.5 <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <8.0 <br /> Vinyl Chloride <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 1,3-Butadiene NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Bromomethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <8.0 <br /> Chloroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <7.9 <3.2 <br /> Freon 11 2.8 59 44 72 87 94 92 68 48 87 <br /> Ethanol 34 <4.6 21 <4.8 <5.9 <7.0 <8.5 18 870 E <3.2 <br /> Freon 113 <0.5 4 2.8 5.7 4.9 6 5 3.3 2.1 3.8 <br /> 1,1-Dichloroethene <0.5 <0.5 3.2 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Acetone 13 6.8 22 <4.8 7.7 <7.0 13 <4.5 <7.9 <8.0 <br /> 2-Propanol NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <3.2 <br /> Carbon Disulfide <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <7.9 <3.2 <br /> 3-Chloropropene NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <3.2 <br /> Methylene Chloride <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <8.0 <br /> Methyl tert-butyl ether NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> trans-1,2-Dichloroethene NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Hexane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 1,1-Dichloroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 2-Butanone(Methyl Ethyl Ketone) 8.3 3.2 4.1 <1.2 1.8 <1.8 4.9 <1.1 <7.9 <3.2 <br /> cis-1,2-Dichloroethene <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Tetrahydrofuran <0.5 37 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Chloroform <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 1,1,1-Trichloroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Cyclohexane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Carbon Tetrachloride <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 2,2,4-Trimethylpentane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Benzene <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 1,2-Dichloroethane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Heptane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> Trichloroethene <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 1,2-Dichloropropane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 1,4-Dioxane NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <3.2 <br /> Bromodichloromethane NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> cis-1,3-Dichloropropene <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br /> 4-Methyl-2-pentanone NT NT 1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <br />