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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -4 Sample Type: Air Sampling Date 8/20/07 1/29/08 7/29/08 1/22/09 7/15/09 3/2/10 9/3/10 1/25/11_ Monitoring and Field Parameters Volatile Oraanic Compounds PPB (v/v Freon 12 81 11 22 600 100 26 21 25 Freon 114 12 2.1 6.7 130 18 4.8 3.3 5.6 Chloromethane <0.5 <0.5 <4.8 <8.1 <4. <4.7 <4.8 <4. my hlon a <0.5 <0.5 <1.2 120 <1.2 <1.2 <1.2 <1. 1,3 -Butadiene NT NT <1.2 <2.0 <1.2 <1.2 <1.2 <1.2 Bromomethane <0.5 <0.5 <1.2 <2.0 <1.2 <1.2 <1.2 <1.2 Chloroethane < .5 <0.5 < <2.0 <1.2 <1.2 <1.2 <1.2 Freon 11 29 4.4 19 170 39 15 8.4 9.2 Ethanol NT NT 5.3 <8.1 <4.6 <4.7 <4.8 9.6 Freon 113 1.8 <0.5 <1.2 18 2.3 1.2 <1.2 <1.2 1,1-Dichloroethene <0.5 <0.5 <1.2 3.1 <1.2 <1.2 <1.2 <1.2 Acetone 6.8 8 50 12 <4.6 6.4 6.6 5.3 2 -Propanol NT NT <4.8 <8.1 <4.6 <4.7 <4.8 <4.8 Carbon Disulfide <0.5 <0.5 <1.2 <2.0 <1.2 <1.2 <1.2 <1.2 3-Chloropropene NT NT <4.8 <8.1 <4.6 <4.7 <4.8 <4.8 Methylene Chloride <1.0 <1.0 <1.2 <2.0 <1.2 <1.2 <1.2 2.0 Methyl tert-butyl ether NT NT <1.2 <2.0 <1.2 <1.2 <1.2 <1.2 trans-1,2-Dichloroethene NT NT <1.2 <2.0 <1.2 <1.2 <1.2 <1.2 Hexane <1.0 <1.0 <1.2 32 <1.2 <1.2 <1.2 <1.2 1, -Dic oroet ane <0.5 <0.5 <1.2 <2. <1.2 <1.2 <1.2 <1.2 2-Butanone (Methyl Ethyl Ketone) 8.8 4.8 4.5 <2.0 <1.2 <1.2 1.7 <1.2 1.1.1 -Trichloroethane <0.5 <0.5 <1.2 <2.0 <1.2 <1.2 <1.2 <1.2