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J HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL G-2 Intermediate 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 (percentT 0 0 0 0 0 0 Carbon Dioxide (percent) 1.1 2.6 3.4 3.6 4.3 4.5 Oxygen (percent) 13.2 8.7 6.5 9 5.9 8.9 Volatile Organic Compounds PPB (v/v) <1.1 <•i .L <-i .0 ---I. I Acetone <4.6 33 9 4.5 <4.8 14 A p a- loroto uene <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 Benzene <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 Bromo ichloromethane <1.1 <1.0 <1. <1.0 <1.2 <1.1 Bromo orm <1. <1.0 <1.2 <1. <1.2 <1.1 Benzyl Chloride <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 romomet ane <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 Carbon Disu ide <T-1 <1.0 <1.2 <1.0 <1.2 <1.1 1,3 -Butadiene < <1.0 <1.2 <1.0 <1.2 <1.1 2- utanone 4.0 .5 <1.2 <1.0 <1.2 5.2 Carbon Tetrachloride <1.1 <1. <1.2 <1.0 <1. <1. Ch orobenzene <1.1 -<1.0 < .2 <1. <1.2 <1.1 Chloroethane <T. 1 < .0 <1.2 <1.0 <1.2 <1.1 Chloroform 1.4 1.9 1.4 1.9 1.8 1.8 Chloromethane <4.6 <4.0 <4.9 <4.2 <4.8 <4.4 3- hloropropene <4.6 <4. <4.9 <4.2 <4.8 <4.4 umeme <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 2 -Di romoethane <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 <1.0 <1.2 <1. Dibromochloromethane <1.1 <•i .L <-i .0 ---I. I 1,2 -Dichlorobenzene <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 1,3 -Dichlorobenzene <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 1,4 -Dichlorobenzene < <1.0 <1.2 <1.0 <1.2 <1.1 Dichlorodifluoromethane (Freon 2) 8.2 30 20 29 53 44 1,1- ich oroethane < <1.0 <1.2 <1.0 <1.2 <1.1 1,2-Dichloroet ane <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 1, -Dich oro -1, ,2,2- etre luoroethane(Freon 4) <1.1 3.6 6.3 3.6 7.8 6.2