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0 9 0 <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -3 Shallow <br />Sample Type: Air <br />Sampling 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 />0.8 <br />0.8 <br />0.8 <br />0.7 <br />0.9 <br />Oxygen (percent) <br />17.6 <br />17.6 <br />18.5 <br />19.6 <br />18.2 <br />Volatile Organic Compounds PPB (v/v) <br />Acetone <br />32 <br />6.8 <br />5.8 <br /><5.2 <br />NR <br />Alphas Ih orotoluene <br /><1.4 <br /><1.2 <br /><1. <br /><1.3 <br />NR <br />Benzene <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Bromodich oromethane <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Bromo orm <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Benzyl h ori a <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Bromomethane <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />-�_ arbon Disul ide <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />1,3 -Butadiene <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />2-butanone <br />3.8 <br />2.3 <br />1.3 <br /><1.3 <br />NR <br />arbon Tetrachloride <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Chlorobenzene <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Chloroethane <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Chloroform <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />Chloromethane <br /><5.6 <br /><4.7 <br /><4.7 <br /><5.2 <br />NR <br />3-Chloropropene <br /><5.6 <br /><4.7 <br /><4.7 <br /><5.2 <br />NR <br />Cumeme <br /><1.4 <br /><1.2 <br /><1.2 <br /><1.3 <br />NR <br />1 1-ilirhlnmathanP <1.4 <1.2 <1.2 <1.3 NR <br />