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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -5 <br />Sample Type: Air <br />Sampling Date 9/5/07 3/11/08 7/28/08 1/23/09 7/14/09 1/29/10 <br />Monitoring and Field Parameters <br />Met ane oncentration (percent) 0 0 0 NT 0 <br />Carbon Dioxide (percent) 20.5 4.5 2.2 5.1 NT 2.9 <br />Oxygen (percent) 3.2 13.5 18.3 4.6 NT 16.6 <br />Volatile Organic Compounds PPB(v/v� <br />Acetone <4.6 6.6 9.1 NT 6.4 <4.7 <br />Alpha-Chlorotoluene <br /><1.1 <br /><1.0 <br /><1.2 <br />NT <br /><1.1 <br /><1.2 <br />Benzene <br /><1.1 <br /><1. <br /><1.2 <br />NT <br /><1.1 <br /><1.2 <br />romo ich oromet ane <br />< <br /><1.0 <br /><1.2 <br />NT <br />< <br /><1.2 <br />Bromo orm <br />< <br />< <br /><1.2 <br />NT <br /><1 • <br /><1.2 <br />romomethane <br /><1.1 <br /><1.2 <br />NT <br /><1.1 <br /><1. <br />Garbon Disulfide <br />< <br /><1.0 <br /><1.2 <br />NT <br />1.6 <br /><1.2 <br />3- uta iene <br />< <br />< <br /><1.2 <br />NT <br /><1.1 <br /><1.2 <br />2- utanone <br />1.6 <br /><1.0 <br /><1.2 <br />NT <br /><1.1 <br /><1. <br />ar on Tetrachloride <br />< <br /><1.0 <br /><1.2 <br />NT <br /><1 • <br /><1.2 <br />Ch oro enzene <br /><1.1 <br /><1.0 <br /><1.2 <br />NT <br /><1.1 <br /><1.2 <br />Chloroethane <br />< <br /><1.0 <br /><1.2 <br />NT <br />< <br /><1.2 <br />Chloroform <br />1.7 <br /><1.0 <br /><1.2 <br />NT <br />< <br /><1.2 <br />Chloromethane <br /><4.6 <br /><4.0 <br /><4.8 <br />NT <br /><4.6 <br /><4.7 <br />3-C loropropene <br /><4.6 <br /><4.0 <br /><4.8 <br />NT <br /><4.6 <br /><4.7 <br />umeme <br /><1.1 <br /><1.0 <br /><1.2 <br />NT <br />2.4 <br /><1.2 <br /><1. <br />