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U HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -9 Sample Type: Air Sampling Date 1/29/08 7/29/08 1/23/09 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 Volatile Oraanic Compounds PPB (v/v Freon 12 <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 Freon 114 <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 Chloromethane <0.5 <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <7.8 <3.3 Vinyl Chloride <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 1,3 -Butadiene NT <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 Bromomethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <7.8 <8.2 Chloroethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 <3.1 <3.3 Freon 11 <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 Ethanol <4.6 5.8 30 <4.5 13 <4.3 15 32 <3.1 <3.3 Freon 113 1,1-Dichloroethene <0.5 <0.5 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 <1.2 <1.2 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 <0.78 <0.78 <0.82 <0.82 Acetone <0.5 22 7 6.1 6 10 <4.3 11 <7.8 <8.2 2 -Propanol NT <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 Carbon Disulfide <0.5 3 <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 <3.1 <3.3 3-Chloropropene NT <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 <3.1 <3.3 Methylene Chloride <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <7.8 <8.2 Methyl tert-butyl ether trans- 1,2-Dichloroethene NT NT <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 <1.2 <1.2 <1.1 <1.1 <1.1 <1.1 <1.1 <1.1 <0.78 <0.78 <0.82 <0.82 Hexane <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 1,1-Dichloroethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 2-Butanone (Methyl Ethyl Ketone) 50 4.5 <1.1 <1.1 1.4 1.6 1.2 <4.3 <3.1 <3.3 cis-1,2-Dichloroethene <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 Tetrahydrofuran 940 <1.1 <1.1 <1.1 2.5 <1.1 <1.1 <1.1 <0.78 <0.82 Chloroform <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 1,1,1 -Trichloroethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82 Cvclohexane <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 <0.78 <0.82