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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -2 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 Monitoring and Field Parameters Volatile Organic Compounds PPB (v/v) Freon 12 1.8 1.8 860 82 710 22 13 58 Freon 114 <0.5 <1.2 140 13 120 3.3 2.4 11 1,3 -Butadiene N i <I./- </-.0 < 1.L --c.o � 1. 1 11.4 - .f- Bromomethane <0.5 <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2 Chloroethane <.5 < <2.8 < <.6 <1. <.2 <4.8 Freon 11 <0.5 <1.2 13 1.6 16 <1.1 <1.2 1.5 Ethanol 18 <4.8 <11 6.2 <10 <4.6 6.5 120 Freon 113 <0.5 <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2 1,1-Dichloroethene <0.5 <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2 Acetone 14 26 <11 17 15 10 4.9 4.9 2 -Propanol NT <4.8 <11 <5 <10 <4.6 <4.7 <4.8 3-Chloropropene NT <4.8 <11 <5 <10 <4.6 <4.7 <4.8 Methvlene Chloride 1.3 <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2 Methvl tert-butvl ether NT <1.2 <2.8 <1.2 < < < <1.2 trans-1,2-Dichloroethene NT <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2 Hexane <1.0 <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2 -Dic oroet ane <0.5 <1.2 <2.8 <1.2 <2. <1.1 <1. <1.2 2-Butanone (Methyl Ethyl Ketone) 4.1 6.2 <2.8 1.4 <2.6 2.1 <1.2 <4.8 '1,1,1 -Trichloroethane <0.5 < <2.8 <11.2 <2.6 <1.1 <1.2 <1.2 Cyclohexane <1.0 <1.2 <2.8 <1.2 <2.6 <1.1 <1.2 <1.2