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Sample Type: Air <br />Samplinq Date <br />Monitorina and Field Parameters <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -1 Shallow <br />7/28/08 1/30/09 7/14/09 1/29/10 8/7/12 <br />Methane Concentration (percent) <br />0 <br />0 <br />0 <br />0 <br />0 <br />Carbon Dioxide (percent) <br />0.3 <br />0.8 <br />1.9 <br />2.2 <br />1.6 <br />Oxygen (percent) <br />18.5 <br />18.4 <br />17.8 . <br />17.9 <br />18.1 <br />Carbon Tetrachloride <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Volatile Organic Compounds P (v/v) <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Acetone <br />15 <br /><4.5 <br />14 <br /><4.7 <br />NR <br />Alpha-Chlorotoluene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Benzene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Bromodichloromethane <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Bromoform <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Bromomethane <br /><1.0 <br /><1.1 <br /><1.2 <br /><1:2 <br />NR <br />2-Butanone <br />1 <br /><1.1 <br />4.5 <br /><1.2 <br />NR <br />Carbon Disulfide <br />18 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />1,3 -Butadiene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Carbon Tetrachloride <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Chlorobenzene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Chloroethane <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Chloroform <br />< . <br />.1 <br /><1.2 <br /><1.2 <br />NR <br />Chloromethane <br /><4.1 <br /><4.5 <br /><5.0 <br /><4.7 <br />NR <br />3-Chloropropene <br /><4.1 <br /><4.5 <br /><5.0 <br /><4.7 <br />NR <br />Cumeme <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />1,2-Dibromoethane <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />1,2-Dichloropropane <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Cyclohexane <br /><1.0 <br />3.8 <br /><1.2 <br /><1.2 <br />NR <br />Dibromochloromethane <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />1,2 -Dichlorobenzene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />1,3 -Dichlorobenzene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />1,4 -Dichlorobenzene <br /><1.0 <br /><1.1 <br /><1.2 <br /><1.2 <br />NR <br />Dichlorodifluoromethane (Freon 12) <br /><1.0 <br /><1.1 <br />5 <br />4 <br />NR <br />