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C <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -T <br />Sample Type: Air <br />Sampling Date 3/11/08 7/29/08 1/30/09 7/14/09 1/29/10 <br />Monitoring and Field Parameters <br />Methane oncentration (percent) 4.4 2.1 2.1 NT 0 <br />Carbon Dioxide (percent) 11.9 4.8 2.9 NT 0.1 <br />Oxvaen (percent) 11.2 16.3 17.5 NT 20.6 <br />Volatile Organic Compounds PPB (v/v) <br />Acetone <br />210 <br />160 <br />38 <br />57 <br />4.4 <br />Alpha- loroto uene <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />Benzene <br />56 <br />100 <br />86 <br />260 <br />6 <br />Bromo ich oromethane <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />Bromo orm <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />Benzyl oride <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />romomet ane <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1. <br />arbon isul ide <br />5.9 <br />890 <br />60 <br />1200 <br />3.4 <br />1,3 -Butadiene <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />2- utanone <br />4.6 <br />22 <br />3.9 <br />17 <br />2.4 <br />Carbon Tetrachloride <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />C lorobenzene <br /><2.0 <br /><5.4 <br /><1.4 <br />3.5 <br /><1.1 <br />loroethane <br />73 <br />66 <br />63 <br />98 <br />2 <br />Chloroform <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />h oromethane <br /><8.1 <br /><22 <br /><5.7 <br /><14 <br /><4.4 <br />3-C loropropene <br /><8.1 <br /><22 <br /><5.7 <br /><14 <br /><4.4 <br />umeme <br /><2.0 <br /><5.4 <br />< .4 <br />4.1 <br /><1.1 <br />