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�_J HISTORICAL SUMMARY OF ANALYTICAL RE UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -3 Intermediate Sample Type: Air Sampling Date 7/28/08 1/30/09 7/14/09 1/29/10 8/7/12 Monitoring and Field Parameters Methane Concentration (percent) 0 0 0 0 Carbon Dioxide (percent) 0.9 1.3 1 1.5 0.5 Oxygen (percent) 17 16.6 17.9 18.2 19.3 Volatile Organic Compounds PPB (v/v) <1.3 <1.L <1.L <'i.L Acetone 21 <4.8 <4.6 18 Alp a- oroto uene <1.3 <1.2 <1.2 <1.2 Benzene <1.3 <1.2 <1.2 <1.2 Bromodich oromethane <1.3 <1. <1.2 <1.2 Bromo orm <1.3 <1. <1.2 <1.2 Benzyl Chloride <1.3 <1.2 < .2 <1.2 Bromomet ane <1.3 <1.2 <1.2 <1.2 Car on Disu ide <1.3 <1.2 <1.2 <1.2 1,3 -Butadiene <1.3 <1.2 <1. <1.2 2- utanone <1.3 <1.2 <1.2 6.2 Carbon Tetrachloride < .3 < .2 <1.2 <1.2 h oro enzene <1.3 <1.2 <1.2 <1.2 Gh oroet ane <1.3 <1. <1.2 <1.2 Chloroform < .3 <1.2 <1.2 <1.2 hloromethane <5. <4.8 <4.6 <4.7 3-C oropropene <5.1 <4. <4.6 <4.7 umeme <1.3 <'I.2 <1.2 <1. -Dibromoethane <1.3 <1.2 <1.2 <1.2 exane Dibromochloromethane <1.3 <1.L <1.L <'i.L 1,2 -Dichlorobenzene <1. <1.2 <1.2 <1.2 1,3 -Dichlorobenzene <1.3 <1.2 <1.2 <1.2 1,4 -Dichlorobenzene <1.3 <1.2 <1.2 <1.2 Dichlorodifluoromethane <1.3 <1.2 <1.2 <1.2 1, - is loroet ane <1.3 <1.2 <1.2 <1.2 1,2- ichloroethane < <1.2 <1.2 <1.2 1,2- ichloro-1,1,2, -Tetra uoroethane <1.3 <1.2 <1.2 <1.2