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M ® ® ® s = ® ® ® = = = ® ® ® M <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-8 <br /> Sample Type:Air <br /> Sampling Date 3/13/07 8/20/07 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 8/7/12 <br /> Monitoring and Field Parameters <br /> Methane Concentration (percent) 0 0 0 0 0 0 0 NM <br /> Carbon Dioxide(percent) 1 0.3 0.9 0.5 1.6 0.7 2 NM <br /> Oxygen (percent) 19.3 19.3 17.6 18.5 16.5 19.4 19 NM <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 800 490 1300 260 1300 500 440 NS <br /> Freon 114 <0.5 <0.5 <0.5 9.5 <160.0 15 <58 NS <br /> Chloromethane <0.5 <0.5 <0.5 <4.1 <650.0 <6.3 <230 NS <br /> Vinyl Chloride <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> 1,3-Butadiene NT NT NT <1.0 <160.0 <1.6 <58 NS <br /> Bromomethane <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> Chloroethane <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> Freon 11 460 300 880 220 960 400 430 NS <br /> Ethanol NT NT NT 18 <650.0 <6.3 <230 NS <br /> Freon 113 <0.5 16 <0.5 11 <160.0 13 <58 NS <br /> 1,1-Dichloroethene <0.5 <0.5 <0.5 13 <160.0 <1.6 110 NS <br /> Acetone <0.5 <0.5 <0.5 18 <650.0 8 <230 NS <br /> 2-Propanol NT NT NT <4.1 <650.0 <6.3 <230 NS <br /> Carbon Disulfide <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> 3-Chloropropene NT NT NT <4.1 <650.0 <6.3 <230 NS <br /> Methylene Chloride <1.0 <1.0 <1.0 1.6 <160.0 <1.6 <58 NS <br /> Methyl tert-butyl ether NT NT NT <1.0 <160.0 <1.6 <58 NS <br /> trans-1,2-Dichloroethene NT NT NT <1.0 <160.0 <1.6 <58 NS <br /> Hexane <1.0 <1.0 <1.0 <1.0 <160.0 <1.6 <58 NS <br /> 1,1-Dichloroethane <0.5 40 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> 2-Butanone(Methyl Ethyl Ketone) NT NT NT 3.8 <160.0 <1.6 <58 NS <br /> cis- -Dic oroe Nene <0, < < < <160.0 <1.6 <58 NS <br /> Tetrahydrofuran <0.5 <0.5 <0.5 1.2 <160.0 <1.6 <58 NS <br /> Chloroform <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> 1,1,1-Trichloroethane NT NT NT <1.0 <160.0 2 <58 NS <br /> Cyclohexane <1.0 <1.0 <1.0 <1.0 <160.0 <1.6 <58 NS <br /> Carbon Tetrachloride <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> 2,2,4-Trimethylpentane <1.0 <1.0 <1.0 <1.0 <160.0 <1.6 <58 NS <br /> Benzene <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br /> 1,2-Dichloroethane <1.0 <1.0 <1.0 <1.0 <160.0 <1.6 <58 NS <br /> Heptane <1.0 <1.0 <1.0 <1.0 <160.0 <1.6 <58 NS <br /> Trichloroethene <1.0 <1.0 <1.0 <1.0 <160.0 <1.6 <58 NS <br /> 1,2-Dichloropropane <0.5 <0.5 <0.5 <1.0 <160.0 <1.6 <58 NS <br />