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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SGA <br />Sample Type: Air <br />Sampling Date 1/29/08 7/29/08 1/22/09 7/15/09 3/2/10 9/3/10 1/25/11 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />0.2 <br />NT <br />0.5 <br />0.7 <br />0.4 <br />0.2 <br />0.5 <br />Carbon Dioxide (percent) <br />0.4 <br />NT <br />0.5 <br />0.5 <br />0.9 <br />0.3 <br />0.4 <br />Oxygen (percent) <br />19.2 <br />NT <br />18.9 <br />16.6 <br />19.3 <br />19.4 <br />17.8 <br />Volatile Organic Compounds PPB (v/v) <br />Freon 12 <br />Freon 114 <br /><0.5 <br /><0.5 <br /><2.2 <br /><2.2 <br /><110 <br /><110 <br /><240 <br /><240 <br /><250 <br /><250 <br />44 <br />6.1 <br /><150 <br /><150 <br />Chloromethane <br /><0.5 <br /><8.8 <br /><450 <br /><960 <br /><990 <br />64 <br /><610 <br />Vinyl Chloride <br /><0.5 <br />3.7 <br />570 <br />560 <br />440 <br />620 <br />310 <br />1,3 -Butadiene <br />NT <br /><2.2 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />Bromomethane <br /><0.5 <br /><2.2 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />Chloroethane <br /><0.5 <br /><2.2 <br />150 <br /><240 <br /><250 <br />170 <br /><150 <br />Freon 11 <br />Ethanol <br /><0.5 <br />NT <br /><2.2 <br /><8.8 <br /><110 <br /><450 <br /><240 <br /><960 <br /><250 <br /><990 <br /><4.8 <br /><19 <br /><150 <br /><610 <br />Freon 113 <br /><0.5 <br /><2.2 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />1,1-Dichloroethene <br /><0.5 <br /><2.2 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />Acetone <br />5.9 <br /><8.8 <br /><450 <br /><960 <br /><990 <br />23 <br /><610 <br />2 -Propanol <br />NT <br /><8.8 <br /><450 <br /><960 <br /><990 <br /><19 <br /><610 <br />Carbon Disulfide <br /><0.5 <br />5.8 <br /><110 <br /><240 <br /><250 <br />160 <br /><150 <br />3-Chloropropene <br />NT <br /><8.8 <br /><450 <br /><960 <br /><990 <br /><19 <br /><610 <br />Methylene Chloride <br /><0.5 <br />2.7 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />Methyl tert-butyl ether <br />trans-1,2-Dichloroethene <br />NT <br />NT <br /><2.2 <br /><2.2 <br /><110 <br /><110 <br /><240 <br /><240 <br /><250 <br /><250 <br /><4.8 <br /><4.8 <br /><150 <br /><150 <br />Hexane <br /><1.0 <br /><2.2 <br /><110 <br /><240 <br /><250 <br />4.8 <br /><150 <br />1, 1 -Dichloroethane <br /><0.5 <br /><2.2 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />2-Butanone (Methyl Ethyl Ketone) <br />cis-1,2-Dichloroethene <br />7 <br /><0.5 <br />13 <br /><2.2 <br /><110 <br /><110 <br /><240 <br /><240 <br /><250 <br /><250 <br /><4.8 <br /><4.8 <br /><150 <br /><150 <br />Tetrahydrofuran <br />110 <br /><2.2 <br /><110 <br /><240 <br /><250 <br /><4.8 <br /><150 <br />0 0 0 <br />