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HISTORICAL <br />SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED <br />ZONE AIR <br />NORTH COUNTY SANITARY <br />LANDFILL <br />SG -4 <br />Sample Type: Air <br />Sampling Date <br />9/29/03 <br />2/12/04 <br />5/7/04 <br />7/22/04 <br />11/9/04 2/10/05 <br />9/30/05 <br />6/26/06 <br />11/18/06 <br />3/2/07 <br />9/5/07 <br />3/11/08 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />0 <br />0 <br />0 <br />0 <br />0 0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />Carbon Dioxide (percent) <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br />0.1 <br />0.5 <br />0.1 <br />Oxygen (percent) <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br />21.1 <br />19.1 <br />20.6 <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 (Dichlorodifluoromethane) <br /><0.5- <br />7.5 <br /><0.5 <br />2.4 <br /><0.5 17 <br />6.2 <br />16 <br /><0.5 <br /><0.5 <br />2.2 <br /><1.0 <br />114 (1,2-Dichloro-1,1,2,2-Tetrafl <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />_Freon <br />Chloromethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><4.6 <br /><4.1 <br />Vinyl Chloride <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />1,3 -Butadiene <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />Bromomethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br />6.9 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />Chloroethane <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />Freon 11 (Trichlorofluoromethane) <br /><0.5 <br />8.2 <br /><0.5 <br />2.5 <br /><0.5 11 <br />8.9 <br /><0.5 <br /><0.5 <br /><0.5 <br />1.5 <br /><1.0 <br />Ethanol <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br /><0.05 <br /><4.6 <br /><4.1 <br />Freon 113 <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br /><1.0 <br />1,1-Dichloroethene (1 1-Dichloroethyle <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5. <br /><1.1 <br /><1.0 <br />Acetone <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />6.8 <br />9.6 <br />5.1 <br />2 -Propanol <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br />NT <br /><4.6 <br /><4.1 <br />Carbon Disulfide <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />1.6 <br /><1.1 <br /><1.0 <br />3-Chloropropene <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br />NT <br /><4.6 <br /><4.1 <br />Methylene Chloride <br />1.3* <br />2.4* <br /><1.0 <br />{1.0} <br /><1.0 <1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.1 <br /><1.0 <br />Methyl tert-butyl ether <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />trans-1,2-dichloroethene <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br /><1.1 <br /><1.0 <br />Hexane <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br /><0.05 <br /><1.1 <br /><1.0 <br />1,1-Dichloroethane <br /><0.5 <br />1.7 <br /><0.5 <br /><0.5 <br /><0.5 2.3 <br />2.4 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />2-butanone <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />3.4 <br /><1.0 <br />cis-1,2-Dichloroethene <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />Tetrah drofuran <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br /><0.05 <br />4.1 <br /><1.0 <br />Chloroform <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />1,1,1 -Trichloroethane <br /><0.5 <br />1.1 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />Cyclohexane <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br /><0.05 <br /><1.1 <br /><1.0 <br />Carbon Tetrachloride <br /><0.5 <br />4.1 <br /><0.5 <br />1 <br /><0.5 3.8 <br />4.9 <br /><0.5 <br /><0.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />2 2,4-Trimethylpentane <br />NT <br />NT <br />NT <br />NT <br />NT NT <br />NT <br />NT <br />NT <br /><0.05 <br /><1.1 <br /><1.0 <br />Ran7ana <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <0.5 <br /><0.5 <br /><0.5 <br />1.5 <br /><0.5 <br /><1.1 <br /><1.0 <br />