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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -2 Deep 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 Carbon Dioxide (percent) 0.5 1.2 1.6 1.2 0.9 1.8 Oxygen (percent) 18.4 17.1 14.2 15.4 17.6 15.3 Volatile Organic Compounds PPB (v/v) <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 Acetone 4.7* 6.1 8.5 <4.1 5.9 <4.8 Alpha-Chloroto uene <1. <1.0 <1.6 <1.0 <1.2 <1.2 Benzene 1.2 <1.0 <1.6 <1.0 <1.2 <1.2 Bromo is loromet ane <1.1 < .0 <1.6 <1.0 < <1.2 romo orm <T1 <1.0 <1.6 <1.0 <1.2 <1.2 Benzyl Chloride <1.1 <1.0 <1.6 < <1.2 <1.2 Bromomet ane <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 Carbon Disulfide 4.2 <1.0 <1.6 < <1.2 <1.2 1,3 -Butadiene <1. <1.0 <1. <1.0 <1.2 <1.2 2- utanone 2.6 <1.0 < <1.0 1.4 Carbon Tetrachloride <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 h oro enzene <1.1 <1. <1.6 <1. <1.2 <1.2 Chloroethane <1.1 <1. <1.6 < <1.2 <1.2 Chloroform <1.1 < <1.6 <1. <1.2 <1.2 Chloromethane <4.6 <4.0 <6.2 <4. <4.9 <4.8 3-Chloropropene <4.6 <4.0 <6.2 <4.1 <4.9 <4.8 umeme <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 1,2- ibromoet ane <1. <1.0 <1.6 <1.0 <1. <1.2 <1. <1. 1,2 -Dichlorobenzene <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 1,3 -Dichlorobenzene <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 1,4 -Dichlorobenzene <1.1 <1.0 <1.6 <1.0 <1. <1.2 Dichlorodifluoromethane (Freon 12) 6.6 5.9 14 13 15 28 1,1-Dichloroethane <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 1,2-Dichloroethane <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 2-Dichloro-1,1, ,2 -Tetra luoroethane(Freon 114) <1.1 <1.0 2.4 1.7 1.7 4