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�J HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -7 Sample Type: Air Sampling Date 8/20/07 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 9/3/10 1/25/11 Monitoring and Field Parameters Volatile Oraanic Compounds_PPB (v/v Freon 12 8 130 79 150 170 110 120 79 Freon 114 <0.5 2.7 2.4 3.4 3.9 2.8 3.2 2.2 Chloromethane <0.5 <0.5 <5. 1 <4.8 <5. <7.0 <8.5 <4.5 Vinyl hloride <0.5 <0.5 <1. <1. <1.5 <1.8 <2.1 <1. 1,3 -Butadiene NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 Bromomethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 Chloroethane <0.5 <0.5 < <1.2 <1.5 <1. <2. <1.1 Freon 11 2.8 59 44 72 87 94 92 68 Ethanol 34 <4.6 21 <4.8 <5.9 < <8.5 18 Freon 113 <0.5 4 2.8 5.7 4.9 6 5 3.3 1,1-Dichloroethene <0.5 <0.5 3.2 <1.2 <1.5 <1.8 <2.1 <1.1 Acetone 13 6.8 22 <4.8 7.7 <7.0 13 <4.5 2 -Propanol NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 Carbon Disulfide <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 -- 3-Chloropropene NT NT <5.1 <4.8 <5.9 <7.0 <8.5 <4.5 Methylene Chloride <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 Methyl tert-butyl ether NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 trans-1,2-Dichloroethene NT NT <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 Hexane <1.0 <1.0 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 -Dich oroet ane <0.5 <0.5 <1.3 < 1.12 <1.5 <1.8 <2. <1.1 2-Butanone (Methyl Eth I Ketone) 8.3 3.2 4.1 <1.2 1.8 <1.8 4.9 <1.1 ria_ _ irh nmit ani <n 5 <11.11 <1 3 <1-2 <1.5 <1.8 < <1.1 Chloroform <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.1 1. 1, 1 -Trichloroethane <0.5 <0.5 <1.3 <1.2 <1.5 <1.8 <2.1 <1.