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C 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 Monitorina and Field Parameters Volatile Organic Compounds PPB (v/v) Freon 12 <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 1 <1.1 <1.1 <0.5 <1.1 <1.1 <1.1 <1.2 <1. Freon 114 _ 1,3 -Butadiene NT <1.1 <1.1 <1.1 <'I. I <,I.-[ <-i .-i Bromomethane <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 Chloroethane < <1.1 < <1, < <1.1 <1.1 <4.3 Freon <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 l Ethanol <4.6 5.8 30 <4.5 13 <4.3 15 32 Freon 113 <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 1,1-Dichloroethene <0.5 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 Acetone <0.5 22 7 6.1 6 10 <4.3 11 2 -Propanol NT <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 Carbon Disulfide <0.5 3 <1.1 <1.1 <1.2 <1.1 <1.1 <4.3 3-Chloropropene NT <4.3 <4.5 <4.5 <4.7 <4.3 <4.3 <4.3 Methylene Chloride <1.0 <1.1 <1.1 <1.1 <1.2 < < <1.1 -- Methyl tert-butyl ether NT <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 _ trans-1,2-Dichloroethene NT <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 Hexane <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1 1. - is oroet ane <0. <1.1 <1.1 < <1.2 <1.1 <1.1 <1.1 2-Butanone (Methyl Ethyl Ketone 50 4.5 <1.1 <1.1 1.4 1.6 1.2 <4.3 cis- ,2- is oroet ene <0.5 < <1. < <1.2 <1.1 <1.1 <1.1 Tetrahydrofuran 940 <1.1 <11.1 <1.1 2.5 < <1.1 <1. loro orm < <1.1 <1.1 <1.1 < <1.1 <1.1 <1. 1,1,1 -Trichloroethane <0.5 < < <1.1 <1, <1.1 < <1.1 Cyclohexane <1.0 <1.1 <1.1 <1.1 <1.2 <1.1 <1.1 <1.1