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wr ■w a � � w � � ® it ur w ■r �wr HISTORICAL SUMMARY OF ANALYI UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG-11 Sample Type:Air Sampling Date 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 3/18/14 Monitoring and Field Parameters Methane Concentration (percent) 11.5 7.8 0.7 0 0 3.2 0 0 0 0 0 Carbon Dioxide(percent) 13.9 13.8 15.4 13.3 12.4 14 7.2 7.9 8.5 7.9 12.7 Oxygen (percent) 0 0 0 4.7 5 0.3 13.3 12.7 10.9 11.8 4.8 Volatile Organic Compounds PPB (v/v) Freon 12 1300 790 650 210 350 230 620 240 200 86 370 Freon 114 370 230 180 75 110 81 190 79 68 33 120 Chloromethane <19 <12 <8.8 <4.4 <4.1 <4.8 <23 <3.2 <11 <12 <4.5 Vinyl Chloride 120 54 3.1 <1.1 <1.0 9.2 21 <0.79 <1.1 <1.2 <1.1 1,3-Butadiene <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Bromomethane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <23 <7.9 <11 <12 <11 Chloroethane <4.7 <2.9 <2.2 <1.1 <1.0 <4.8 <9.2 <3.2 <4.4 <4.8 <4.5 Freon 11 8.5 4.7 6.2 1.4 2.6 1.7 4.4 1.8 1.5 <1.2 2.5 Ethanol <19 <12 <8.8 7.0 8.0 100 <9.2 <3.2 <4.4 9.6 <4.5 Freon 113 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 1,1-Dichloroethene 82 45 9.1 <1.1 <1.0 9.0 24 <0.79 <1.1 <1.2 <1.1 Acetone <19 <12 <8.8 9 <4.1 <4.8 <23 <7.9 <11 18 <11 2-Propanol <19 <12 <8.8 <4.4 <4.1 <4.8 <9.2 <3.2 <4.4 <4.8 <4.5 Carbon Disulfide <4.7 <2.9 <2.2 1.9 <1.0 <4.8 <9.2 <3.2 <4.4 <4.8 <4.5 3-Chloropropene <19 <12 <8.8 <4.4 <4.1 <4.8 <9.2 <3.2 <4.4 <4.8 <4.5 Methylene Chloride <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <23 <7.9 <11 <12 <11 Methyl tert-butyl ether <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 trans-1,2-Dichloroethene <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Hexane 14 7.1 2.2 <1.1 <1.0 1.2 3.5 <0.79 <1.1 <1.2 <1.1 1,1-Dichloroethane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 2-Butanone(Methyl Ethyl Ketone) <4.7 <2.9 <2.2 1.4 <1.0 <4.8 <9.2 <3.2 <4.4 <4.8 <4.5 cis-1,2-Dichloroethene <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Tetrahydrofuran <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Chloroform <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 1,1,1-Trichloroethane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Cyclohexane 14 8.3 <2.2 <1.1 <1.0 1.3 3.5 <0.79 <1.1 <1.2 <1.1 Carbon Tetrachloride <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 2,2,4-Trimethylpentane 42 25 9.8 <4.4 <1.0 4.3 9.8 <0.79 <1.1 <1.2 <1.1 Benzene <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 1,2-Dichloroethane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Heptane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 Trichloroethene 21 13 2.5 <1.1 <1.0 5.2 11 <0.79 <1.1 <1.2 <1.1 1,2-Dichloropropane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 1,4-Dioxane <19 <12 <8.8 <4.4 <4.1 <4.8 <9.2 <3.2 <4.4 <4.8 <4.5 Bromodichloromethane <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1 cis-1,3-Dichloropropene <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 <0.79 <1.1 <1.2 <1.1