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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-7 <br /> Sample Type:Air <br /> Sampling Date 8/20/07 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 /> Monitorina and Field Parameters <br /> Methane Concentration(percent) 0 0 0 0 0 0 0 0 0 0 0 0 0.1 <br /> ar on Dioxide(percent) 0.3 .4 0. 0.4 0.3 0.8 0.4 0.5 0.5 0.6 0.4 0.5 0.5 <br /> xygen (percent) 20 9 18 .7 19.6 19.9 18. 6.5 19.6 19.6 20 20.5 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 8 130 79 150 170 110 120 79 47 90 74 48 39 <br /> Freon 114 <0.5 2.7 2.4 3.4 3.9 2.8 3.2 2.2 <2.0 2.6 2.3 <2.4 <1.0 <br /> Chloromethane <0.5 <0.5 <5.i <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <8.0 <6.7 <24 <10 <br /> Hyl Chloride <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> 1,3-Butadiene NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> _ Bromomethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <8.0 <17 <24 <10 <br /> Ch oroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1. <7.9 <3.2 <6.7 <9.6 <4.2 <br /> Freon 11 2.8 59 44 72 87 94 92 68 48 87 74 49 41 <br /> Ethanol 34 <4.6 21 <4. <5.9 <7.0 <8.5 18 870 E <3.2 <6.7 <9.6 <4. <br /> Freon 113 <0.5 4 2.8 5.7 4.9 6 5 3.3 2.1 3.8 1.8 3.1 1.9 <br /> 1,1-Dichloroethene <0.5 <0.5 3.2 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> Acetone 13 6.8 22 <4.8 7.7 <7.0 13 <4.5 <7.9 <8.0 <17 <24 <10 <br /> 2-Propanol NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <3.2 <6.7 <9.6 <4.2 <br /> Carbon Disulfide <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <7.9 <3.2 <6.7 <9.6 <4.2 <br /> 3-Chloropropene NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 <7.9 <3.2 <6.7 <9.6 <4.2 <br /> Methylene Chloride <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <8.0 <17 <24 <10 <br /> Methyl tert-butyl ether NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> trans-1,2-Dichloroethene NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> Hexane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> 1,1-Dich oroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> 2-Ma-none(Methyl Ethyl Ketone) 8.3 3.2 4.1 <1.2 1.8 <1.8 4.9 <1.1 <7.9 <3.2 <6.7 <9.6 <4.2 <br /> cis-1, <0.5 <0.5 <1.3 <1. <1.5 <1.8 <2.1 <1.1 <2. <0.80 <1.7 <2.4 <1.0 <br /> Tetrahydro uran <0.5 37 <1.3 <1.2 < .5 < .8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> hloroform <0.5 <0.5 <T-3- <1. <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br /> trichloroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 <2.0 <0.80 <1.7 <2.4 <1.0 <br />