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HISTORICAL SUMMARY OF ANALYI <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-T <br /> Sample Type:Air <br /> Sampling Date 1/23/09 7/15/09 3/2/10 <br /> Monitorinq and Field Parameters <br /> Methane Concentration (percent) NT NT NT <br /> Carbon Dioxide(percent) NT NT NT <br /> Oxygen (percent) NT NT NT <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 2200 1400 1600 <br /> Freon 114 120 90 89 <br /> Chloromethane <48 <290 <310 <br /> Vinyl Chloride 170 120 220 <br /> 1,3-Butadiene <12 <72 <78 <br /> Bromomethane <12 <72 <78 <br /> Chloroethane <12 280 430 <br /> Freon 11 600 720 610 <br /> Ethanol 28000 <290 <310 <br /> Freon 113 <12 <72 <78 <br /> 1,1-Dichloroethene <12 <72 150 <br /> Acetone <48 <290 <310 <br /> 2-Propanol <48 <290 <310 <br /> Carbon Disulfide 270 <72 <78 <br /> 3-Chloropropene <48 <290 <310 <br /> Methylene Chloride 77 <72 210 <br /> Methyl tert-butyl ether <12 <72 <78 <br /> trans-1,2-Dichloroethene <12 <72 <78 <br /> Hexane 680 980 630 <br /> 1,1-Dichloroethane 100 180 140 <br /> 2-Butanone(Methyl Ethyl Ketone) <12 <72 <78 <br /> cis-1,2-Dichloroethene 26 <72 <78 <br /> Tetrahydrofuran 32 <72 <78 <br /> Chloroform <12 <72 <78 <br /> 1,1,1-Trichloroethane <12 <72 <78 <br /> Cyclohexane 490 950 620 <br /> Carbon Tetrachloride <12 <72 <78 <br /> 2,2,4-Trimethylpentane 280 490 380 <br /> Benzene 29 <72 <78 <br /> 1,2-Dichloroethane <12 <72 <78 <br /> Heptane 140 520 240 <br /> Trichloroethene 44 110 88 <br /> 1,2-Dichloropropane <12 <72 <78 <br /> 1,4-Dioxane <48 <290 <310 <br /> Bromodichloromethane <12 <72 <78 <br />