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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-1 <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 7/29/11 4/12/12 8/7/12 1/28/13 9/11/13_ <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 0.2 NT 0.5 0.7 0.4 0.2 0.5 0.5 0.4 0.5 0.4 0 <br /> Carbon Dioxide(percent) 0.4 NT 0.5 0.5 0.9 0.3 0.4 0.5 0.4 0.4 0.5 0 <br /> Oxygen(percent) 19.2 NT 18.9 16.6 19.3 19.4 17.8 16.3 18.4 18.5 18.7 20.6 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 <0.5 <2.2 <110 <240 <250 44 <150 <52 <320 <160 <180 <1.8 <br /> Freon 114 <0.5 <2.2 <110 <240 <250 6.1 <150 <52 <320 <160 <180 <1.8 <br /> Chloromethane <0.5 <8.8 <450 <960 <990 64 <610 <210 <3200 <640 <1800 <18 <br /> Vinyl Chloride <0.5 3.7 570 560 440 620 310 130 840 450 480 2.3 <br /> 1,3-Butadiene NT <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> Bromomethane <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <3200 <1600 <1800 <18 <br /> Chloroethane <0.5 <2.2 150 <240 <250 170 <150 <210 <1300 <640 <710 <7.1 <br /> Freon 11 <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> Ethanol NT <8.8 <450 <960 <990 <19 <610 <210 1400 <640 <710 7.7 <br /> Freon 113 <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> 1,1-Dichloroethene <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> Acetone 5.9 <8.8 <450 <960 <990 23 <610 280 <3200 <1600 2000 <18 <br /> 2-Propanol NT <8.8 <450 <960 <990 <19 <610 720 <1300 <640 <710 <7.1 <br /> Carbon Disulfide <0.5 5.8 <110 <240 <250 160 <150 230 1400 960 <710 <7.1 <br /> 3-Chloropropene NT <8.8 <450 <960 <990 <19 <610 <210 <1300 <640 <710 <7.1 <br /> Methylene Chloride <0.5 2.7 <110 <240 <250 <4.8 <150 <52 <3200 <1600 <1800 <18 <br /> Methyl tert-butyl ether NT <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> trans-1,2-Dichloroethene NT <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> Hexane <br /> <1.0 <2.2 <110 <240 <250 4.8 <150 <52 <320 <160 <180 <1.8 <br /> 1,1-Dichloroethane_ <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> 2-Butanone(Methyl Ethyl Ketone) 7 13 <110 <240 <250 <4.8 <150 <210 <1300 <640 <710 <7.1 <br /> cis-1,2-Dichloroethene <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> Tetrahydrofuran 110 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> Chloroform <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br /> 1,1,1-Trichloroethane <br /> <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 <180 <1.8 <br />