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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 Met ane oncentration (percent) 0 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) <'[ .'I < 1.0 --1.0 -- 1.0 < I./- � I ./- Acetone 4.7* 6.1 8.6 <4.1 6.9 <4.8 _ Alpha-Chloroto uene Benzene < .2 <1,0 <1.0 <1.6 <1.6 < ,0 <1.0 <1.2 <1.2 <1.2 <1.2 13romodic 11 loromet ane <1. <1.0 6 <1.0 <1.2 <1.2 r3�1'orm <1.1 < .0 <1.6 <1. < <1.2 Benzyl Chlon a <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 _ Bromomethane <1.1 <1.0 <1.6 < <1.2 <1.2 _ Carbon Disu ide 4.2 <1.0 <1.6 <1. <1.2 <1.2 1,3- uta iene < <1.0 <1.6 < .0 <1.2 <1. 2-butanone 2.6 <1.0 <1.6 <1.0 1.4 2 ar on etrac lori a <1. : <1.6 <1.0 < <1.2 Ch oro enzene_ <1. <1.0 < <1.0 <1.2 <1.2 oroetane < <,0 <.6 <.0 <.2 <.2 Chloroform < <1.0 < .6 <1.0 <1. <1.2 oromethane <4. <4.0 <6. <4.1 <4.9 <4.8 - C oropropene <4.6 <4.0 <6. <4.1 <4.9 <4.8 --Gumeme < <1.0 <1.6 <1.0 <1.2 <1.2 2- i r>i omoethane < <1.0 < < <1, <1.2 _- i,2--ic oror p ne < <1.0 <1.6 <1.0 <1.2 <1.2 Dibromochloromethane <'[ .'I < 1.0 --1.0 -- 1.0 < I./- � I ./- ichorobenzene < <1.0 <1, <1, <1.2 <1.2 1,3- ich oro enzene <1. <1. <1.6 <1. <1.2 <1.2 1,4 -Dichlorobenzene <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 -tic Iii orotic Ifluoromet ane (Freon 12) 6.6 6.9 14 13 15 28 -Dic oroet ane <1.1 <1.0 <1.6 <1.0 <1.2 <1.2 1,2- ich oroethane <1, < <1.6 < <1.2 <1.2 1,2- ichloro-V,1,2,2-Tetra luoroet ane (Freon 4) <1.1 <1.0 2.4 1.7 1.7 4