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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE AIR NORTH COUNTY SANITARY LANDFILL SG -7 Sample Type: Air Sampling Date 9/5/07 3/11/08 7/28/08 1/23/09 7/14/09 1/29/10 Monitoring and Field Parameters Met ane Concentration (percent) 0 0 0 0 NT 0 Carbon Dioxide (percent) 3.5 1.4 2 1.8 NT 2.2 Oxvaen (percent) 16.5 17.6 17.9 16.4 NT 14.9 Volatile Organic Compounds PPB (v/v) Acetone 5.3 6.8 14 NT 7.7 <4.5 Alpha- h orotoluene <1.1 <1.0 <1.1 NT <1.1 <1.1 Benzene <1.1 <1.0 <1.1 NT <1.1 <1.1 Bromodic oromethane <1.1 <1.0 <1.1 NT <1.1 <1.1 romp orm <1.1 <1.0 <1.1 NT <1.1 <1.1 Benzyl onde <1.1 < .0 < NT <1.1 <1.1 romomet ane <1.1 Carbon Disulfide <1.1 <1.0 <1.1 NT <1.1 <1.1 1,3 -Butadiene < <1.0 <1.1 NT <1.1 <1.1 2-butanone 2.0 <1.0 <1.1 NT 1.6 1.6 Carbon Tetrachloride <1. <1.0 <1.1 NT <1.1 <1.1 hlorobenzene <1.1 <1.0 <1.1 NT <1.1 <1.1 hloroethane <1.1 <1.0 <1.1 NT <1.1 <1.1 Chloroform <1.1 <1.0 <1.1 NT <1.1 <1.1 --Chloromet ane <4.6 <4.0 <4.5 <4.6 <4.5 3-Chforopropene <4.6 <4.0 <4.5 NT <4.6 <4.5 umeme <1. <1.0 <1.1 NT <1.1 <1.1 2 -Di romoethane <1.1 <1.0 <1.1 NT <1.1 <1.1 ne <1.