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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-3 <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 0.0 <br /> Car on Dioxide(percent) 3.1 3.3 3.2 2.6 2.1 1.8 2.4 2.2 1.6 1.7 0.1 <br /> Oxygen (percent) 19.2 15.9 16.9 16.7 18.9 18.8 17.7 16.7 18.5 18.7 18.7 20.4 <br /> Volatile Organic Compounds PPB (v/v) <br /> Freon 12 18 78 250 120 36 31 35 48 120 60 34 48 <br /> Freon 114 2 25 38 20 5.4 4.5 5.2 7.6 19 8.7 5.1 8.1 <br /> Chloromethane <0.5 <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 <6.8 <3.3 <12 <11 <br /> -Vinyl Chloride <0.5 <1.1 <1.4 <1.3 < < <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> 1,3-Butadiene NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> Bromomethane <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <6.8 <8.2 <12 <11 <br /> hloroethane <br /> <0.5 < <1.4 < <1.2 <1.2 <1.0 <4.1 <2.7 <3.3 <4.8 <4.3 <br /> Freon 11 20 78 120 54 21 14 17 28 56 27 16 23 <br /> Ethanol NT <4.6 <5.4 <5.2 <4.8 <4.7 6.0 190 <2.7 <3.3 <4.8 <4.3 <br /> Freon 113 <0.5 2.3 4.9 1.8 <1.2 <1.2 <1.0 <1.0 2.1 1.1 <1.2 <1.1 <br /> _ 1,1-Dichloroethene <0.5 2.8 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> Acetone 4.7 15 11 <5.2 9.7 7 4.9 4.4 7.6 <0.82 <12 <11 <br /> 2-Propanol NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 1 <4.1 <2.7 <8.2 <4.8 <4.3 <br /> Carbon Disulfide <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <4.1 <2.7 <3.3 <4.8 <4.3 <br /> 3-Chloropropene NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 <2.7 <3.3 <4.8 <4.3 <br /> Methylene Chloride <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <6.8 <0.82 <12 <11 <br /> Methyl tert-butyl ether NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> trans-1,2-Dichloroethene NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> Hexane <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> 1,1-Dicfiloroet a- n- a <0.5 <1. <1.4 <1.3 <1. <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> 2-Butanone (Methyl Ethyl Ketone) 5.3 1.6 <1.4 <1.3 <1.2 1.8 <1.0 <4.1 <2.7 <3.3 <4.8 <4.3 <br /> cis-1,2-DicTi7oroet ene <0.5 <1.1 <1.4 <1.S <1.T <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> Tetrahydro uran 75 <1.1 <1.4 <1.3 < <1.2 <1.0 <1.0 <0.68 <0.82 <1.2 <1.1 <br /> Chlorotorm <0.5 <1. <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 < 2 <1.2 <1.1 <br /> 1,1,1-Tri oroet ane <0.5 <1.1 < .4 < .3 <1.2 <1.2 <1.0 <1.0 <0.68 <0 88 <1.2 <1.1 <br />