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M M W M M M M M M M M =1 W M M ® M M M <br />HISTORICAL SUMMARY OF ANALYTICAL RESUL" <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -2 Shallow <br />Sample Type: Air <br />Sampling Date 3/11/08 7/28/08 1/30/09 7/14/09 1/29/10 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />0 <br />0 <br />0 <br />0 <br />0 <br />Carbon Dioxide (percent) <br />2.3 <br />2.2 <br />2.8 <br />3.8 <br />4 <br />Oxygen (percent) <br />11.1 <br />15.6 <br />12.8 <br />8.3 <br />11.3 <br />Volatile Organic Compounds PPB (v/v) <br />< <br />< <br /><1.1 <br />< <br /><1.1 <br />Acetone <br />4.9 . <br />37 <br />10 <br />5.3 <br /><4.4 <br />Alpha-Chlorotoluene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Benzene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Bromodichloromethane <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Bromo orm <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Benzyl Chloride <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Bromomethane <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Carbon Disulfide <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />1,3 -Butadiene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />2-butanone <br /><1.2 <br />8 <br />3.2 <br />1.4 <br /><1.1 <br />-Carbon Tetrachloride <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />Chlorobenzene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1A <br />hloroethane <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />hh loroorm <br /><1.2 <br />1.5 <br /><1.1 <br /><1.2 <br /><1.1 <br />loromethane <br /><4.8 <br /><5.1 <br /><4.6 <br /><4.7 <br /><4.4 <br />3-Chloropropene <br /><4.8 <br /><5.1 <br /><4.6 <br /><4.7 <br /><4.4 <br />Cumeme <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />1,2 -Dichlorobenzene <1.2 <1.3 <1.1 <1.2 <1.1 <br />1,3 -Dichlorobenzene <1.2 <1.3 <1.1 <1.2 <1.1 <br />1,4 -Dichlorobenzene <1.2 <1.3 <1.1 <1.2 <1.1 <br />Dichlorodifluoromethane (Freon 12) 14 6 11 44 35 <br />1.1-Dichloroethane <1.2 <1.3 <1.1 <1.2 <1.1 <br />1,2-Dichloroethane <br />< <br />< <br /><1.1 <br />< <br /><1.1 <br />1,2-Dichloro-1,1,2,2-Tetrafluoroethane( reon 114) <br />1.8 <br />1.4 <br />1.5 <br />5.9 <br />5.1 <br />1,1-Dichloroethylene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />cis-1,2-Dichloroethene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />trans-1,2-dichloroethene <br /><1.2 <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />-4-1 -e4inh1nrnnrr%r-%,=nc <br /><1 % <br /><1.3 <br /><1.1 <br /><1.2 <br /><1.1 <br />cis-1,3-Dichloropropene <1.2 <1.3 <1.1 <1.2 <1.1 <br />trans-1,3-Dichloropropene <1.2 <1.3 <1.1 <1.2 <1.1 <br />ne « <br />