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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -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 (percent) 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) Acetone <4.6 33 9 4,5 <4.8 14 Alpha-� oroto uene --- -Benzene < < <1.0 <1.0-<1.2 <1.2 <1.0 <1.0 <1.2 <1.2 <1.1 <1.1 roB modich�oromethane <1, < < <1.0 <1.2 <1.1 Bromoform < .1 <1.0 <1.2 <1.0 <1.2 <1.1 Benzyl -C onde Brom omethane <1.1 <1-.1 <1.0 <170 <1.2 <1. <1.0 <1.0 <1.2 <1.2 <1. <1.1 ---Carbon Disu i e < <1 .0 <1.2 <1.0 <1. <1.1 -1,3-Butadiene < < <1. <1.0 < <1. 2- utanone 4.0 3.5 <1.2 <1.0 <1.2 5. Carbonetrach oride C loro enzene <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 Chloroethane <1.1 <1.0 oro orm 1.4 1.9 1.4 1.9 1.8 1.8 Chloromet ane <4.6 <4.0 <4.9 <4.2 <4.8 <4.4 3 -Ch oropropene Cumeme <4.6 <1.1 <4. <1.0 <4.9 <1.2 <4.2 <1.0 <4.8 <1.2 <4.4 <1.1 1 �_rlihrmm�at ane <1.1 <1.0 <1.2 < <1.2 < .1 1,2-Dic oropropene <1.1 <1.0 <12 <1.0 <1.2 <1.1 D'ibromoc oromet ane <1.1 <1.0 <1.2 <1.0 <1.2 <1.1 1,2 -Dichlorobenzene < < <1.2 <1.0 <1.2 <1.1 3-Dic oro_ enzene <1.1 <1.0 <1.2 <1.0 <1.2 <1A ne ne 1,2-D-icfiloroet ane < < <1.2 < .0 <1.2 <1.1 -- �,2-Di-`chi- ,2- etre uoroethane (Freon 14 < 3. 3.6 7.86.2