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w r M w w = " ® w ® = r M ® ® " M M <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-6 <br /> Sample Type: Air <br /> Sampling Date 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 <br /> Carbon Dioxide (percent) 3.5 3.3 3.9 2.5 2.3 2.8 2.1 2.8 <br /> Oxygen (percent) 15.7 14.6 12.4 18 17.7 17.8 19.1 18.4 <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 810 250 350 740 290 180 68 200 <br /> Freon 114 36 10 16 32 11 7.7 2.5 7.9 <br /> Chloromethane <12 <4.7 <4.8 <28 <4.3 <11 <11 <4.6 <br /> Vinyl Chloride <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <br /> 1,3-Butadiene <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <br /> Bromomethane <2.9 <1.2 <1.2 <28 <11 <11 <11 <12.0 <br /> Chloroethane <2.9 <1.2 <4.8 <11 <4.3 <4.5 <4.5 <4.6 <br /> Freon 11 330 110 240 340 130 85 30 100 <br /> Ethanol <12 17 330 <11 <4.3 <4.5 <4.5 <4.6 <br /> Freon 113 18 6.4 9.5 17 5.8 4.3 1.4 5.5 <br /> 1,1-Dichloroethene <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <br /> Acetone <12 11 7.4 <28 <11 <11 <11 60 <br /> 2-Propanol <12 <4.7 <4.8 <11 <4.3 <4.5 <4.5 25 <br /> Carbon Disulfide <2.9 <1.2 <4.8 <11 <4.3 <4.5 <4.5 <4.6 <br /> 3-Chloropropene <12 <4.7 <4.8 <11 <4.3 <4.5 <4.5 <4.6 <br /> Methylene Chloride <2.9 <1.2 <1.2 <28 <11 <11 <11 <12.0 <br /> Methyl tert-butyl ether <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> trans-1,2-Dichloroethene <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> Hexane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 2.8 <br /> 1,1-Dichloroethane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> 2-Butanone (Methyl Ethyl Ketone) <2.9 <1.2 <4.8 <11 <4.3 <4.5 <4.5 22 <br /> cis-1,2-Dichloroethene <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> Tetrahydrofuran <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 38 <br /> Chloroform <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> 1,1,1-Trichloroethane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> Cyclohexane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 1.8 <br /> Carbon Tetrachloride <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> 2,2,4-Trimethylpentane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> Benzene <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 1.6 <br /> 1,2-Dichloroethane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br /> Heptane <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 1.2 <br /> Trichloroethene <2.9 <1.2 <1.2 <2.8 <1.1 <1.1 <1.1 <1.2 <br />