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M r ® ® M 1=1 ® ® ® ® ® w r M = = ® ® M <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SGA <br />Sample Type: Air <br />Sampling Date 10/1/03 2/11/04 5/6/04 7/21/04 11/15/04 2/11/05 10/3/05 6/30/06 11/29/06 3/13/07 8/20/07 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />NR <br />0 <br />0 <br />0 <br />0.2 <br />0.1 <br />0.4 <br />0 <br />0 <br />0.1 <br />0.4 <br />Carbon Dioxide (percent) <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />0 <br />0.9 <br />0.1 <br />Oxygen (percent) <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />20.6 <br />19.9 <br />18.5 <br />trans- 1,2-Dichloroethene <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />Volatile Organic Compounds PPB (v/v) <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br />Freon 12 <br />173 <br />18.4 <br />39 <br />307 <br />269 <br />380 <br />256 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />Freon 114 <br /><0.5 <br />1.4 <br />12 <br />27 <br />24 <br />28 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br /><0.5 <br />Chloromethane <0.5 2.7 49 <0.5 50 86 <0.5 <0.5 <0.5 <0.5 <0.5 <br />Vinyl Chloride 316 22 764 1.1 662 796 1368 610 <0.5 <0.5 320 <br />1,3 -Butadiene NT NT NT NT NT NT NT NT NT NT NT <br />Bromomethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />Chloroethane <0.5 5.8 205 <0.5 204 369 448 <0.5 <0.5 <0.5 <0.5 <br />Freon 11 <0.5 <0.5 2.0 2.7 2.8 5.1 <0.5 <0.5 <0.5 <0.5 <0.5 <br />Ethanol NT NT NT NT NT NT NT NT NT NT NT <br />Freon 113 NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />1,1-Dichloroethene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />Acetone NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />2 -Propanol _ NT NT NT NT NT NT NT NT NT NT NT <br />Carbon Disulfide NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />3-Chloropropene <br />NT <br />NT <br />NT_ <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />Methylene Chloride <br />308 <br />1.6* <br />1.2 <br />1.5 <br />2.9 <br />1.7 <br /><1.0 <br /><1.0 <br /><1.0 <br /><0.5 <br /><0.5 <br />Methyl tert-butyl ether <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />trans- 1,2-Dichloroethene <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />NT <br />Hexane <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br /><1.0 <br />1,1-Dichloroethane <0.5 <0.5 6.3 <0.5 4.7 8.3 <0.5 <0.5 <0.5 <0.5 <0.5 <br />2-Butanone (Methyl Ethyl Ketone) NT NT NT NT <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />cis- 1,2-Dichloroethene <0.5 <0.5 <0.5 <0.5 2.0 2 <0.5 <0.5 2.9 <0.5 <0.5 <br />Tetrahydrofuran <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />