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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-5 <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 0 0 0 0 0 0 0 0 0 0 <br /> Car ownioxide(percent 0.7 0.6 0.6 0.5 1 0.4------0 0.6 0.7 0.5 0.7 0.7 <br /> Oxygen (percent) 19.7 19 9.6 18.8 20.2 20.2 18.8 18 19.4 19.8 19.6 19.6 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 1.5 1.2 <1.1 <1.1 <br /> Freon 114 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Chloromethane <0.5 <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <8.1 <3.4 <11 <11 <br /> Vinyl Cdonde <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> 1,3-Butadiene NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Bromomethane <br /> <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <8.1 <8.6 <11 <11 <br /> Chloroethane <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <4.2 <3.2 <3.4 <4.4 <4.5 <br /> Freon 11 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Ethanol NT <4.7 <4.4 <4.7 8.4 <4.6 19 27 <3.2 <3.4 <4.4 14 <br /> Freon 113 <br /> <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> 1,1-Dichloroethene <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Acetone 4.6 19 12 5.9 62 10 <4.7 5.1 <8.1 <8.6 <11 18 <br /> 2-Propanol NT <br /> <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <3.2 <3.4 <4.4 <4.5 <br /> Carbon Disulfide 1.1 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <4.2 <3.2 <3.4 <4.4 <4.5 <br /> 3-Chloropropene NT <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 <3.2 <3.4 <4.4 <4.5 <br /> Methylene Chloride <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <8.1 <8.6 <11 <11 <br /> <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> trans-1,2-D-Dichloroethene NT <1.2 <1.1 <br /> Methyl butyl ether NT <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Hexane <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0_ <0.81 <0.86 1.1 <1.1 <br /> 1,1-,1 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 < <1.1 <br /> 2-Butanone(Methyl Ethyl Ketone) 10 3 3.5 <1.2 13 2 <1.2 <4.2 <3.2 <3.4 <4.4 <4.5 <br /> cis-1,2- i- 6 chloroet ene <0.5 <1.2 <1.1 <1.2 <1. <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Tetrahydrofuran 180 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> Chlorof=orm <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br /> 1,1,1-Trichloroethane <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 <0.81 <0.86 <1.1 <1.1 <br />