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HISTORICAL SUMMARY OF ANALYTICAL RE UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -3 Shallow Sample Type: Air Sampling Date 7/28/08 1/30/09 7/14/09 1/29/10 8/7/12 Monitoring and Field Parameters Met ane Concentration (percent) 0 0 0 0 0 Carbon Dioxide (percent) 0.8 0.8 0.8 0.7 0.9 Oxygen (percent) 17.6 17.6 18.5 19.6 18.2 Volatile Organic Compounds PPB (v/v) Acetone 32 6.8 5.8 <5.2 A p a- orotoluene <1.4 <1. <1.2 <1.3 Benzene <1.4 < <1.2 <1.3 Bromodic oromethane <1.4 <1.2 <1.2 <1.3 romo orm <1.4 <1.2 <1.2 <1.3 Benzyl Chloride <1.4 <1.2 < <1.3 romomethane <1.4 <1.2 <1.2 <1. Carbon Disulfide <1.4 <1.2 <1.2 <1. 1,3-Buta iene <1.4 <1.2 <1.2 <1.3 2-butanone 3.8 2.3 1.3 <1. ar on Tetrac oride < .4 < .2 <1.2 <1.3 hlorobenzene <1.4 <1.2 <1.2 <1. Chloroethane <1.4 <1.2 <1.2 <1.3 Ch oro orm <1.4 <1.2 <1.2 <1.3 Chloromethane <5.6 <4.7 <4.7 <5.2 3- loropropene <5.6 <4.7 <4.7 <5. umeme <1.4 <1.2 <1.2 <1.3 2-Dibromoethane <1.4 <1.2 <1.2 <1.3 1,2- is loropropane <1.4 <1.2 <1. < .3 Dibromochloromethane <1.4 <1.1 <1.L <'I . j - ich orobenzene <1.4 <1. <1.2 <1.3 - is orobenzene <1.4 <1.2 <1.2 <1. 1,4 -Dichlorobenzene <1.4 <1.2 <1.2 <1.3 -------Dichlorodifluoromethane <1.4 <1.2 <1.2 <1.3 1,1-Dic oroethane <1.4 < <1.2 <1.3 1,2-Dich oroethane <1.4 <1.2 <1.2 <1.3 1,2-Dic oro -1,1,2,2- etra luoroet ane <1.4 <1.2 <1.2 <1.3