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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-9 <br /> Sample Type:Air <br /> Sampling Date 1/29/08 7/29/08 1/23/09 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 0 0 0 0 0 0 0 0 0 0 0.1 <br /> Carbon Dioxide (percent) 0.4 0.3 0.4 0.2 0.8 0.3 0.4 0.5 0.5 0.4 0.4 0.4 <br /> Oxygen (percent) 20.1 19.8 20 20 20.1 20.4 18.9 18 20 19.7 20 20.9 <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 <br /> <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Freon 114 <br /> <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Chloromethane <0.5 <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <7.8 <3.3 <10 <12 <br /> Vinyl Chloride <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Bro Butadiene NT <1.1 <1.2 <1.1 <1.1 <1.1 <7.8 <8.2 <10 <12 <br /> Bromomethane <0.5 <1.1 <1.1 <br /> Chloroethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 <3.1 <3.3 <4.2 <4.8 <br /> Ethanoll <4.6 5.8 30 <br /> <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Freon <4.5 13 <4.3 15 32 <3.1 <3.3 <4.2 81 <br /> Freon 113 <br /> <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> 1,1-Dichloroethene <br /> <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Acetone <br /> <0.5 22 7 6.1 6 10 <4.3 11 <7.8 <8.2 <10 <12 <br /> 2-Propanol NT <br /> <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 <4.2 <4.8 <br /> Carbon Disulfide <0.5 3 <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 <3.1 <3.3 <4.2 <4.8 <br /> 3-Chloropropene NT <br /> <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 <4.2 <4.8 <br /> Methylene Chloride <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <7.8 <8.2 <10 <12 <br /> Methyl tert-butyl ether NT <br /> <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> trans-1,2-Dichloroethene NT <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Hexane <br /> <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> 1,1-Dichloroethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> 2-Butanone (Methyl Ethyl Ketone) 50 4.5 <1.1 <1.1 1.4 1.6 1.2 <4.3 <3.1 <3.3 <4.2 <4.8 <br /> cis-1,2-Dichloroethene <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Tetrahydrofuran 940 <1.1 <1.1 <1.1 2.5 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Chloroform <br /> <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> 1,1,1-Trichloroethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br /> Cyclohexane <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 <1.0 <1.2 <br />