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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 4/12/12 8/7/12 Monitoring and Field Parameters Volatile Organic Compounds PPB (v/v) 20 78 120 54 21 14 17 28 56 27 Freon 12 18 78 250 120 36 31 35 48 120 60 Freon 114 2 25 38 20 5.4 4.5 5.2 7.6 19 8.7 Chloromethane <0.5 <4.6 <5.4 <5. <4.8 <4.7 <4.1 <4.1 <6.8 <3. Vinyl Chloride <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 1,3 -Butadiene NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 Bromomethane <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <6.8 <8.2 Chloroethane <0.5 <1.1 <1.4 <1. <1.2 <1.2 <1.0 <4.1 <2.7 <3.3 Freon 11 20 78 120 54 21 14 17 28 56 27 Ethanol NT <4.6 <5.4 <5.2 <4.8 <4.7 6.0 190 <2.7 <3.3 Freon 113 <0.5 2.3 4.9 1.8 <1.2 <1.2 <1.0 <1.0 2.1 1.1 1,1-Dichloroethene <0.5 2.8 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 Acetone 4.7 15 11 <5.2 9.7 7 4.9 4.4 7.6 <0.82 2 -Propanol NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 <2.7 <8.2 Carbon Disulfide <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <4.1 <2.7 <3.3 3-Chloropropene NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 <2.7 <3.3 Methylene Chloride <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <6.8 <0.82 Methyl Cert -butyl ether trans- 1,2-Dichloroethene NT NT <1.1 <1.1 <1.4 <1.4 <1.3 <1.3 <1.2 <1.2 <1.2 <1.2 <1.0 <1.0 <1.0 <1.0 <0.68 <0.68 <0.82 <0.82 Hexane <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 1,1-Dichloroethane <0.5 <1,1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 2-Butanone (Methyl Ethyl Ketone) cis-1,2-Dichloroethene Tetrahydrofuran 5.3 <0.5 75 1.6 <1.1 <1. <1.4 <1.4 <1.4 <1.3 <1.3 <1.3 <1.2 <1.2 <1.2 1.8 <1.2 <1.2 <1.0 < <1. <4.1 <1. <1.0 <2.7 <0.68 <0.68 <3.3 <0.82 <0.82 Chloroform <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82 1.1.1 -Trichloroethane <0.5 <1. <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 <0.82