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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -1 Intermediate <br />Sample Type: Air <br />Samplinq Date 7/28/08 1/30/09 7/14/09 1/29/10 8/7/12 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />0 <br />0 <br />0 <br />0 <br />0 <br />Carbon Dioxide (percent) <br />1.1 <br />1.2 <br />1.4 <br />1.6 <br />0.2 <br />Oxygen (percent) <br />16.5 <br />17 <br />17 <br />17.4 <br />20.8 <br />Volatile Organic Compounds PPB (v/v) <br />Acetone <br /><4.8 <br /><4.8 <br />5.4 <br />5.5 <br />NR <br />Alpha-Chlorotoluene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Benzene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Bromodichloromethane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />_Bromoform <br />Benzyl Chloride <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Bromomethane <br /><1.2 <br /><1.2 <br /><1.2 <br />,c1.2 <br />NR <br />Carbon Disulfide <br /><1.2 <br /><1.2 <br />1.4 <br /><1.2 <br />NR <br />1,3 -Butadiene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />2-butanone <br /><1.2 <br /><1.2 <br />1.6 <br />1.5 <br />NR <br />Carbon Tetrachloride <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Chlorobenzene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Chloroethane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Chloroform <br /><4.8 <br /><4.8 <br /><4.7 <br /><4.8 <br />NR <br />_ <br />Chloromethane <br /><4.8 <br /><4.8 <br /><4.7 <br /><4.8 <br />NR <br />3- hloropropene_ <br /><4.8 <br /><4.8 <br /><4.7 <br /><4.8 <br />NR <br />Cumeme <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />• NR <br />1,2-Dibromoethane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />trans-1,4-dichloro-2-butene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />1,2-Dichloropropane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Cyclohexane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Dibromochloromethane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />1,2 -Dichlorobenzene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />_ <br />1,3 -Dichlorobenzene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />1,4 -Dichlorobenzene <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />Dic lorodifluoromethane (Freon 12) <br />1.7 <br />1.6 <br />6.6 <br />4.8 <br />NR <br />1.1-Dichloroethane <br /><1.2 <br /><1.2 <br /><1.2 <br /><1.2 <br />NR <br />