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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 />1/23/09 <br />7/14/09 <br />1/29/10 <br />9/3/10 <br />1/25/11 <br />7/28/11 <br />4/12/12 <br />8/7/12 <br />1/28/13 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />26.3 <br />NT <br />16 <br />NT <br />28 <br />9 <br />26.7 <br />0 <br />0.4 <br />Dioxide (percent) <br />36 <br />NT <br />22.1 <br />NT <br />30.1 <br />24.2 <br />28.4 <br />20.5 <br />8.6 <br />__Carbon <br />Oxygen (percent) <br />0 <br />NT <br />1.2 <br />NT <br />0 <br />0.6 <br />0 <br />5.5 <br />11.5 <br />_ <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 (Dichlorodifluoromethane) <br />NT <br />440 <br />610 <br /><1.2 <br />640 <br />50 <br />180 <br />1.1 <br />10 <br />Freon 114 (1,2-Dichloro-1,1,2,2-Teti <br />NT <br />39 <br />35 <br /><1.2 <br />72 <br />19 <br />50 <br /><0.84 <br />2.4 <br />Chloromethane <br />NT <br /><8.2 <br /><9.0 <br /><4.8 <br /><19 <br /><4.7 <br /><13 <br /><3.4 <br /><10 <br />Vinyl Chloride <br />NT <br />190 <br />48 <br /><1.2 <br />180 <br />23 <br />160 <br /><0.84 <br /><1.0 <br />1,3 -Butadiene <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><0.84 <br /><1.0 <br />Bromomethane <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><8.4 <br /><10 <br />Chloroethane <br />NT <br />64 <br />31 <br /><1.2 <br />56 <br />11 <br />54 <br /><3.4 <br /><4.2 <br />Freon 11 (Trichlorofluoromethane) <br />NT <br />2.1 <br />6 <br /><1.2 <br /><4.8 <br /><1.2 <br />12 <br /><0.84 <br />1.1 <br />Ethanol <br />NT <br /><8.2 <br /><9.0 <br />12 <br />74 <br />740E <br /><13 <br />170 <br /><4.2 <br />_ <br />Freon 113 <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><1.2 <br /><0.84 <br /><1.0 <br />1, 1 -Dichloroethene (1, 1 -Dichloroethy <br />NT <br />4.4 <br />2.6 <br /><1.2 <br /><4.8 <br /><1.2 <br />7.9 <br /><0.84 <br /><1.0 <br />NT <br />630 <br />96 <br />12 <br />78 <br />17 <br />450 <br /><8.4 <br /><10 <br />_ _Acetone <br />2_Propanol <br />NT <br />9.2 <br /><9.0 <br /><4.8 <br /><19 <br /><4.7 <br /><13 <br /><3.4 <br /><4.2 <br />Disulfide <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><3.4 <br /><4.2 <br />_Carbon <br />3-Chloropropene <br />NT <br /><8.2 <br /><9.0 <br /><4.8 <br /><19 <br /><4.7 <br /><13 <br /><3.4 <br /><4.2 <br />Methylene Chloride <br />NT <br />12 <br /><2.2 <br /><1.2 <br />13 <br />3.4 <br /><3.2 <br /><8.4 <br /><10 <br />Methyl tert-butyl ether <br />NT <br />100 <br /><2.2 <br /><1.2 <br />79 <br />50 <br />85 <br />29 <br />24 <br />trans-1,2-dichloroethene <br />NT <br /><0.84 <br /><1.0 <br />Hexane <br />NT <br />150 <br />180 <br /><1.2 <br />280 <br />30 <br />360 <br />2.4 <br />1.3 <br />1,1-Dichloroethane <br />NT <br />30 <br />13 <br /><1.2 <br />35 <br />13 <br />47 <br />3.6 <br />1.3 <br />2-butanone (Methyl Ethyl Ketone) <br />NT <br />13 <br />2.7 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><3.4 <br /><4.2 <br />cls- 1,2-Dichloroethene <br />NT <br />240 <br />31 <br /><1.2 <br />310 <br />47 <br />440 <br /><0.84 <br /><1.0 <br />Tetrahydrofuran <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><0.84 <br /><1.0 <br />Chloroform <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br />1.6 <br /><1.0 <br />_ <br />1,1,1 -Trichloroethane <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><0.84 <br /><1.0 <br />Cyclohexane <br />NT <br />120 <br />100 <br /><1.2 <br />180 <br />38 <br />260 <br />1.5 <br />1.8 <br />Carbon Tetrachloride <br />NT <br /><2.0 <br /><2.2 <br /><1.2 <br /><4.8 <br /><1.2 <br /><3.2 <br /><0.84 <br /><1.0 <br />