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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -1 Sample Type: Air 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 Monitoring and Field Parameters Methane Concentration (percent) 0.2 NT 0.5 0.7 0.4 0.2 0.5 0.5 0.4 0.5 Carbon Dioxide (percent) 0.4 NT 0.5 0.5 0.9 0.3 0.4 0.5 0.4 0.4 Oxvaen (percent) 19.2 NT 18.9 16.6 19.3 19.4 17.8 16.3 18.4 18.5 Volatile Oraanic Compounds PPB (v/v) Freon 12 Freon 114 <0.5 <0.5 <2.2 <2.2 <110 <110 <240 <240 <250 <250 44 6.1 <150 <150 <52 <52 <320 <320 <160 <160 Chloromethane <0.5 <8.8 <450 <960 <990 64 <610 <210 <3200 <640 Vinyl Chloride <0.5 3.7 570 560 440 620 310 130 840 450 1,3 -Butadiene NT <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 Bromomethane <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <3200 <1600 Chloroethane <0.5 <2.2 150 <240 <250 170 <150 <210 <1300 <640 Freon 11 Ethanol <0.5 NT <2.2 <8.8 <110 <450 <240 <960 <250 <990 <4.8 <19 <150 <610 <52 <210 <320 1400 <160 <640 Freon 113 <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 1,1-Dichioroethene <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 Acetone 5.9 <8.8 <450 <960 <990 23 <610 280 <3200 <1600 2 -Propanol NT <8.8 <450 <960 <990 <19 <610 720 <1300 <640 Carbon Disulfide <0.5 5.8 <110 <240 <250 160 <150 230 1400 960 3-Chloropropene NT <8.8 <450 <960 <990 <19 <610 <210 <1300 <640 Methylene Chloride <0.5 2.7 <110 <240 <250 <4.8 <150 <52 <3200 <1600 Methyl tert-butyl ether trans-1,2-Dichloroethene NT NT <2.2 <2.2 <110 <110 <240 <240 <250 <250 <4.8 <4.8 <150 <150 <52 <52 <320 <320 <160 <160 Hexane <1.0 <2.2 <110 <240 <250 4.8 <150 <52 <320 <160 1,1-Dichloroethane <0.5 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160 2-Butanone (Methyl Ethyl Ketone) cis- 1,2-Dichloroethene 7 <0.5 13 <2.2 <110 <110 <240 <240 <250 <250 <4.8 <4.8 <150 <150 <210 <52 <1300 <320 <640 <160 Tetrahydrofuran 110 <2.2 <110 <240 <250 <4.8 <150 <52 <320 <160