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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -8 Deep Sample Type: Air Sampling Date 7/28/08 1/30/09 7/14/09 1/29/10 Monitoring and Field_ Parameters Methane oncentration (percent) 0 0 0 0 Carbon Dioxide (percent) 0.4 1.2 1 1.5 _ Oxygen (percent) 19.8 18.1 18.7 18.8 Volatile Organic Compounds PPB (v/v) Acetone 10 4.8 <5.3 <4.8 Alpha-Chlorotoluene Bromodichloromethane <1.2 <1.1 <1.3 <1.2 Bromoform <1.2 <1.1 <1.3 <1.2 Benzyl Chloride <1.2 <1.1 <1.3 <1.2 Bromomethane <1.2 <1.1 <1.3 <1.2 Carbon Disul ide 1.5 1.2 <1.3 <1.2 1,3-13utadiene <1.2 <1.1 <1.3 <1.2 2-butanone 1.5 <1.1 <1.3 <1.2 Carbon Tetrachloride <1.2 <1.1 <1.3 <1.2 Chlorobenzene <1.2 <1.1 <1.3 <1.2 Chloroethane <1.2 <1.1 <1.3 <1.2 Chloro ori <1.2 <1.1 <1.3 <1.2 Chloromethane <4.7 <4.5 <5.3 <4.8 3 -Ch oropropene <4.7 <4.5 <5.3 <4.8 Cumeme <1.2 <1.1 <1.3 <1.2 1,2-Dibromoet ane n*.^"1.,,.,.,.---- <1.2 <1 9 <1.1 <1 1 <1.3 <1 1 <1.2 <1 2 Cyclohexane <1.2 <1.1 <1.3 <1.2 Dibromochloromethane <1.2 <1.1 <1.3 <1.2 1,2 -Dichlorobenzene <1.2 <1.1 <1.3 <1.2 1,3-0ichloro-Genzene <1.2 <1.1 <1.3 <1.2 1,4-Diciorobenzene <1.2 <1.1 1.3 <1.2 Dichlorodifluoromethane <1.2 <1.1 <1.3 <1.2 1,1-Dichloroet ane <1.2 <1.1 <1.3 <1.2 1,2-Dichloroethane <1.2 <1.1 <1.3 <1.2 1,2-Dichloro-1,1,2,2-Tetrafluoroethane <1.2 <1.1 <1.3 <1.2 1,1-Dichloroethylene <1.2 <1.1 <1.3 <1.2 cis- 1,2-Dich oroethene <1.2 <1.1 <1.3 <1.2