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L` HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -5 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 Oraanic Compounds PPB (v/v Freon 12 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Freon 114 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Chloromethane < < < < <4.6 <4. < <4. Vinyl ori e < ` • ` ` ` ` ` <1.0 -- 1,3-Butadiene NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Bromomethane <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Freon 11 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Ethanol NT <4.7 <4.4 <4.7 8.4 <4.6 19 27 Freon 113 <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 1,1-Dichloroethene <0.5 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Acetone 4.6 19 12 5.9 62 10 <4.7 5.1 -- -- <4.7 <4.4 <4.7 <4.6 <4.6 <4.1 <4.Y 2 -Propanol NT Carbon Disulfide 1.1 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <4.2 3-Chloropropene NT <4.7 <4.4 <4.7 <4.6 <4.6 <4.7 <4.2 Methylene Chloride <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Methyl tert-butyl ether NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 trans-1,2-Dichloroethene NT <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Hexane <1.0 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 - is oroe ane < < < < < < < <1.0 2- Butanone (Methyl Ethyl Ketone) 10 3 3.5 <1.2 13 2 <1.2 <4.2 Tetrahydrofuran 180 <1.2 <1.1 <1.2 <1.1 <1.1 <1.2 <1.0 Ghlorotorm < < < < < <11 <1.2 <1.0 1. 1.1 -Trichloroethane < <1.2 <1.1 < <1.1 < < <1.0