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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-6 <br /> Sample Type: Air <br /> Sampling Date 11/29/06 3/13/07 8/20/07 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 <br /> Monitoring and Field Parameters <br /> Methane Concentration (percent) 0 0 0 0 0 0 0 0 <br /> Carbon Dioxide (percent) 0.9 1.8 1.9 1.2 3.8 4.9 4.7 5.4 <br /> Oxygen (percent) 13.7 12.7 12.2 15.3 6.2 6.2 8 9.9 <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 530 1500 1900 620 3000 4200 3400 1900 <br /> Freon 114 22 56 75 24 130 190 120 75 <br /> Chloromethane <0.5 <0.5 <0.5 <0.5 <38.0 <47.0 <51 <25 <br /> Vinyl Chloride <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> 1,3-Butadiene NT NT NT NT <9.5 <12.0 <13 <6.3 <br /> Bromomethane <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> Chloroethane <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> Freon 11 190 480 680 240 1200 1300 1000 910 <br /> Ethanol NT NT NT NT <38.0 <47.0 <51 <25 <br /> Freon 113 12 24 41 13 69 96 58 63- <br /> 1,1-Dichloroethene <br /> 31,1-Dichloroethene <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> Acetone <0.5 <0.5 5.3 <0.5 48 <47.0 <51 <25 <br /> 2-Propanol NT NT NT NT <38.0 <47.0 <51 <25 <br /> Carbon Disulfide <0.5 <0.5 <0.5 2.8 <9.5 <12.0 <13 <6.3 <br /> 3-Chloropropene NT NT NT NT <38.0 <47.0 <51 <25 <br /> Methylene Chloride <1.0 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br /> Methyl tert-butyl ether NT NT NT NT <9.5 <12.0 <13 <6.3 <br /> trans-1,2-Dichloroethene NT NT NT NT <9.5 <12.0 <13 <6.3 <br /> Hexane <1.0 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br /> 1,1-Dichloroethane <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> 2-Butanone (Methyl Ethyl Ketone) <0.5 <0.5 19 5.8 <9.5 <12.0 <13 <6.3 <br /> cis-1,2-Dichloroethene 12 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> Tetrahydrofuran <0.5 <0.5 <0.5 94 <9.5 <12.0 <13 <6.3 <br /> Chloroform <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> 1,1,1-Trichloroethane <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> Cyclohexane <1.0 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br /> Carbon Tetrachloride <0.5 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> 2,2,4-Trimethylpentane <1.0 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br /> Benzene 5.4 <0.5 <0.5 <0.5 <9.5 <12.0 <13 <6.3 <br /> 1,2-Dichloroethane <1.0 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br /> Heptane <1.0 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br /> Trichloroethene 11 <1.0 <1.0 <1.0 <9.5 <12.0 <13 <6.3 <br />