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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 Concentration (percent) 0 0 0 0 Carbon Dioxide (percent) 0.4 1.2 1 1.5 19.8 18.1 18.7 18.8 Volatile Organic Compounds PPB -,v/vj <1.2 <1.1 <1.3 <1.2 Acetone 10 4.8 <5.3 <4.8 Alpha- h orotoluene <1.2 <1.1 <1.3 <1.2 Benzene <1. <1.1 <1.3 <1.2 Bromo is oromethane <1.2 <1. <1.3 <1.2 Benzy Ch on e <1.2 <1.1 <1.3 <1.2 Bromomet ane <1.2 <1.1 <1.3 <1.2 1,3-t3utaoiene <I.z <1.1 <-1,3 <-1.z 2-butanone 1.5 <1.1 <1.3 <1.2 Carbon Tetrachloride <1.2 <1.1 <1.3 <1,2 cnioroetnane <I.< <1.1 -1.0 < 1.z Chloroform <1.2 <1.1 <1.3 <1.2 Chloromethane <4.7 <4.5 <5.3 <4. 1,2-Dibromoethane <1.2 <1.1 <1.3 <1.2 2-Dichloropropane <1.2 <1.1 <1.3 <1.2 Cyclohexane <1.2 <1.1 <1.3 <1.2 Dibromochloromet ane <1.2 <1.1 <1.3 <1.2 1,2 -Dichlorobenzene <1.2 <1.1 <1.3 <1.2 1,3- ich oro enzene <1.2 <1.1 <1.3 <1.2 1,4 -Dichlorobenzene <1.2 <1.1 1.3 <1.2 Dichlorodifluoromethane <1.2 <1.1 <1.3 <1.2 1,1- ichloroethane <1.2 <1.1 <1.3 <1.2 1,2- is oroethane <1.2 <1.1 <1.3 <1.2 1,2-Dic oro- ,1,2,2 -Tetra luoroethane <1.2 <1.1 <1.3 <1.2 1,1- is oroethyene <1.2 <1.1 <1.3 <1.2 cis- 1,2-Dic loroethene <1.2 <1.1 <1.3 <1.2 trans - 1, 2-clichIoroethene <1.2 <1. <1.3 <1.2 1,1-dichloropropene <1.2 <1.1 <1.3 <1.2 cis -1,3- is loropropene <1.2 <1.1 <1.3 <1. trans -1, 3-Dichoropropene <1.2 <1.1 <1.3 <1.2