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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -2 Shallow Sample Type: Air Sampling Date 9/5/07 3/11/08 7/28/08 1/30/09 7/14/09 1/29/10 Monitoring and Field Parameters Methane Concentration (percent) 0 0 0 0 0 0 Carbon Dioxide (percent) 1.3 2.3 2.2 2.8 3.8 4 Oxygen (percent) 13.7 11.1 15.6 12.8 8.3 11.3 Volatile Organic Compounds PPB (v/v) Acetone <4.6 4.9 37 10 5.3 <4.4 Alpha-Chlorotoluene <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Benzene <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Bromodichloromethane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Bromo orm <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Benzyl Chloride <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Bromomethane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Carbon Disulfide <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 1,3 -Butadiene <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 2-butanone 3 <1.2 8 3.2 1.4 <1.1 Carbon Tetrachloride <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Chlorobenzene <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Chloroethane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Chloroform 3.8 <1.2 1.5 <1.1 <1.2 <1.1 Chloromethane <4.6 <4.8 <5.1 <4.6 <4.7 <4.4 3-Chloropropene <4.6 <4.8 <5.1 <4.6 <4.7 <4.4 Cumeme <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 1,2-Dibromoethane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 1,2-Dichloropropane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Cyclohexane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 Dibromochloromethane <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <1.