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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-11 <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 7129/11 4/12/12 8/7/12 1/28/13 9/11/13 <br /> Monitoring and Field Parameters <br /> ---We-thane Concentration(percent) 0 NT 11.5 7.8 0.7 0 0 3.2 0 0 0 0 <br /> Carbon iox a percent) 15.5 T 13.9 13.8 15.4 13.3 12.4 14 7.2 7.9 8.5 7.9 <br /> --Oxygen(percent) 1.1 NT 0 0 0 4.7 5 0.3 13.3 12.7 10.9 11.8 <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 440 420 1300 790 650 210 350 230 620 240 200 86 <br /> Freon 114 130 180 370 230 180 75 110 81 190 79 68 33 <br /> �Lioromethane <0.5 <8.8 <19 <12 <8.8 <4.4 <4.1 <4.8 <23 <3.2 < 1 <12 <br /> Vinyl Ion a <0.5 39 120 54 3.1 <1.1 <1.0 9.2 21 <0.79 <1.1 <1.2 <br /> 1,3-Butadiene NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> Bromomethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <23 <7.9 <11 <12 <br /> Cfiioroet ane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <4.8 <9.2 <3.2 <4.4 <4.8 <br /> Freon 1 1 4.1 2.3 8.5 4.7 6.2 1.4 2.6 1.7 4.4 1.8 1.5 <1.2 <br /> Et ano <4.6 <8.8 <19 <12 <8.8 7.0 8.0 100 <9.2 <3.2 <4.4 9.6 <br /> Freon 113 <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> 1,1-D c oroet ene 7 0 2 45 9.1 <1. <1.0 9.0 24 <0.79 <1.1 <1.2 <br /> <0.5 18 <19 <12 <8.8 9 <4.1 <4,8 <23 <7.9 <11 18 <br /> Acetone <br /> 2-Propanol <4.6 <8.8 <19 < 2 <8.8 <4.4 <4.1 <4.8 <9.2 <3.2 <4.4 <4.8 <br /> Carbon Disulfide <0.5 <2.2 <4.7 <2.9 <2.2 1.9 <1.0 <4.8 <9.2 <3.2 <4.4 <4.8 <br /> 3-Chloropropene NT <8.6 <19 <12 <8.8 <4.4 <4.1 <4.8 <9.2 <3.2 <4.4 <4.8 <br /> Methylene Chloride <1.0 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <23 <7.9 <11 <12 <br /> Methyl tert-butyl ether NT <2.2 <4.7 <2.9 <2.2 <11..1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> trans-1,2-Dichloroethene NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> Hexane <1.0 6.4 14 7.1 2.2 <1.1 <1.0 1.2 3.5 <0.79 <1.1 <1.2 <br /> 1,1 rich oroethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> 2-Butanone Methyl Ethyl Ketone 3.5 6.1 <4.7 <2.9 <2.2 1.4 <1.0 <4.8 <9.2 <3.2 <4.4 <4.8 <br /> cis-1,2- ichoroet ene <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> Tetra ydrofuran 64 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1,2 <br /> Chloroform <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> 1,1,1- nchoroet ane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <br /> Cyclohexane 3.6 10 14 8.3 <2.2 <1.1 <1.0 1.3 3.5 <0.79 <1.1 <1.2 <br />