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0 0 0 HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -3 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 Monitoring and Field Parameters Volatile Organic Compounds PPB (v/v Freon 12 18 78 250 120 36 31 35 4 Freon 114 2 25 38 20 5.4 4.5 5.2 7.6 Chloromethane < <4, < < < < < <4. Vinyl one < < <. <.3 < < <.0 <.0 1,3 -Butadiene NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 Bromomethane <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 Chloroethane <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <4.1 Freon 11 20 78 120 54 21 14 17 2tt Ethanol NT <4.6 <5.4 <5.2 <4.8 <4.7 6.0 190 Freon 113 <0.5 2.3 4.9 1.8 <1.2 <1.2 <1.0 <1.0 1,1-Dichloroethene <0.5 2.8 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 Acetone 4.7 15 11 <5.2 9.7 7 4.9 4.4 2 -Propanol NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 Carbon Disulfide <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <4.1 3-Chloropropene NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 Methylene Chloride <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 Methvl tert-butyl ether NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 trans-1,2-Dichloroethene NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1. Hexane <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 - is oroet ane < <1, < -<T3 <1.2 < < < 1.0 2-Butanone (Methyl Ethyl Ketone 5.3 1.6 <1.4 <1.3 <1.2 1.8 <1.0 <4.1 cis- ,2- is oroet ene <U.5 < < < <1.2 < < <1.0 e rah ro uran 75 < < < < < <1.0 <1.0 Ghlorotorm <0.5 < < <1.3 <1. < < <1.0 - nc oroet ane < < <1.4 7173 < < < <1.0 Cyclohexane <10 <11 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 Carhon Tetrachloride <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0