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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 Concentration (percent) 4.4 2.1 2.1 NT <br />Carbon Dioxide (percent) 11.9 4.8 2.9 NT 0.1 <br />Oxygen (percent) 11.2 16.3 17.5 NT 20.6 <br />Volatile Organic Compounds PPB (v/v) <br /><2.0 <br /><5.4 <br />< .4 < .4 <1.1 <br />1,3 -Dichlorobenzene <br /><2.0 <br />Acetone <br />210 <br />160 <br />38 <br />57 <br />4.4 <br />Alp a- oroto uene <br />Benzene <br /><2.0 <br />56 <br /><5.4 --<1.4 <br />100 <br />86 <br /><3.4 <br />260 <br /><1.1 <br />6 <br />romo is loromet ane <br /><2.0 <br /><5.4 <br /><1. <br /><3.4 <br /><1. <br />Bromo orm <br />Benzy one <br />Bromomethane <br /><n <br /><2.0 <br /><5•4 <br /><5.4 <br /><1.4 <br /><T. -4 <br /><3.4 <br /><3.4 <br /><1 <br /><1.1 <br />Carbon Disulfide <br />5.9 <br />890 <br />60 <br />1200 <br />3.4 <br />1,3 -Butadiene <br />2 utanone <br /><2. <br />4. <br /><5.4 <br />2 <br />< <br />.9 <br />7 <br />2.4 <br />Chlorobenzene <br /><2.0 <br /><5.4 <br /><1.4 <br />3.5 <br /><1.1 <br />loroet ane <br />73 <br />66 <br />63 <br />98 <br />Chloroform <br /><2.0 <br /><5.4 <br /><1.4 <br /><3.4 <br /><1.1 <br />oromet ane <br /><8.1 <br /><22 <br /><5.7 <br /><14 <br /><4.4 <br />3-CFloropropene <br />umeme <br />< <br /><5.4 <br /><i.4 <br />4. <br /><1. <br />-1,2-iromoethane <br /><_.0 <br /><5.4 <br /><1.4<3.4 <br /><1.1 <br />ne <br />1,2Dvicvoro enzene <br /><2.0 <br /><5.4 <br />< .4 < .4 <1.1 <br />1,3 -Dichlorobenzene <br /><2.0 <br /><5.4 <br /><1.4 <3.4 < .1 <br />-�,4- is oro enzene <br />4.2 <br />8.6 <br />2. 2 1 <br />Dichlorodifluoromethane (Freon 12) <br />160 <br />72 <br />65 92 1.2 <br />-Dichloroethane <br />23 <br />23 <br />24 45 1.8 <br />