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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG-6 <br />Sample Type: Air <br />Sampling Date <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />Carbon Dioxide (percent) <br />Oxygen (percent) <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 (Dichlorodifluoromethane) <br />Freon 114 (1,2-Dichloro-1,1,2,2-Tetrafluoroethane) <br />Chloromethane <br />Vinyl Chloride <br />1,3-Butadiene <br />Bromomethane <br />Chloroethane <br />Freon 11 (Trichlorofluoromethane) <br />Ethanol <br />Freon 113 <br />1,1-Dichloroethene (1,1-Dichloroethylene) <br />Acetone <br />2-Propanol <br />Carbon Disulfide <br />3-Chloropropene <br />Methylene Chloride <br />Methyl tert-butyl ether <br />trans-1,2-dichloroethene <br />Hexane <br />1,1-Dichloroethane <br />2-butanone (Methyl Ethyl Ketone) <br />cis-1,2-Dichloroethene <br />Tetrahydrofuran <br />Chloroform <br />1,1,1-Trichloroethane <br />Cyclohexane <br />Carbon Tetrachloride <br />2,2,4-Trimethylpentane <br />Benzene <br />1,2-Dichloroethane <br />Heptane <br />Trichloroethene <br />1,2-Dichloropropane <br />1,4-Dioxane <br />Bromodichloromethane <br />cis-1,3-Dichloropropene <br />4-methyl-2pentanone <br />Toluene <br />trans-1,3-Dichloropropene <br />1,1,2-Trichloroethane <br />Tetrachloroethene (PCE) <br />2-Hexanone <br />dibromochloromethane <br />1,2-Dibromoethane <br />8/22/24 1/24/25 5/7/25 <br />NM NM NM <br />NM NM NM <br />NM NM NM <br /><1.4 53 14 <br /><1.4 <24 15 <br /><14 <97 <12 <br />1.8 130 28 <br /><1.4 <24 <1.2 <br /><14 <97 <12 <br /><5.6 <97 <5.0 <br /><1.4 <24 <1.2 <br /><14 <120 <12 <br /><1.4 <24 <1.2 <br /><1.4 <24 <1.2 <br />52 <97 13 <br /><5.6 <120 <5.0 <br /><5.6 <97 <5.0 <br /><5.6 <97 <5.0 <br /><14 <97 <12 <br /><5.6 32 <5.0 <br /><1.4 <24 <1.2 <br /><1.4 120 4.5 <br /><1.4 <24 4.5 <br /><5.6 <97 <5.0 <br /><1.4 62 18 <br /><1.4 <24 <1.2 <br /><1.4 <24 <1.2 <br /><1.4 <24 <1.2 <br /><1.4 76 38 <br /><1.4 <24 <1.2 <br /><1.4 77 58 <br /><1.4 49 6.3 <br /><1.4 <24 <1.2 <br /><1.4 94 2.7 <br /><1.4 <24 3.1 <br /><1.4 <24 <1.2 <br /><5.6 <97 <5.0 <br /><1.4 <24 <1.2 <br /><1.4 <24 <1.2 <br /><1.4 <97 <1.2 <br /><2.8 <24 <2.5 <br /><1.4 <24 <1.2 <br /><1.4 <24 <1.2 <br /><1.4 <24 5.8 <br /><5.6 <97 <5.0 <br /><1.4 <24 <1.2 <br /><1.4 <24 <1.2 <br />27 of 48