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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 Monitoring and Field Parameters Volatile Organic Compounds PPB (v/v) Freon 12 18 78 250 120 36 31 35 48 120 Freon 114 2 25 38 20 5.4 4.5 -5. .2 7.6 19 <5.4 <5.2 <4.8 <4.1 <6.8 hloromethane ' .5 <4. <4.7 <4.1 ," n an 1,3-Buutadtadiene 1 Bromomethane oroethane NT <0.5 <0.5 <1.1 <1.1 <1.1 <1.4 <1.4 <1.4 <1.3 <1.3 <1.2 <1.2 <1.2 <1.2 <1.0 <1.0 <1.0 <1.0 <1.0 <4.1 <0.68 <6.8 < .7 Freon 11 20 78 120 54 21 14 17 28 56 Ethanol NT <4.6 <5.4 <5.2 <4.8 <4.7 6.0 190 <2.7 Freon 113 <0.5 2.3 4.9 1.8 <1.2 <1.2 <1.0 <1.0 2.1 1,1-Dichloroethene <0.5 2.8 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 Acetone 4.7 15 11 <5.2 9.7 7 4.9 4.4 7.6 2 -Propanol NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 <2.7 Carbon Disulfide <0.5 <1.1 <1.4 <1.3 <1,2 <1.2 <1.0 <4.1 <2.7 3-Chloropropene NT <4.6 <5.4 <5.2 <4.8 <4.7 <4.1 <4.1 <2.7 Methylene Chloride <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <6.8 Methyl tert-butyl ether NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 trans-1,2-Dichloroethene NT <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 Hexane <1.0 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 Dic loroet ane < .5 <1. <1.4 <1.3 <1.2 < <1.0 <T. <0.68 2-Butanone (Methyl Ethyl Ketone) 5.3 1.6 <1.4 <1.3 <1.2 -3 .8 1.8 <1.0 <4.1 1 <2.7 2.7 cis -1.2 - -Di c -hl o r o e t h e n e < .5 <1. <1.4 <-i. <1.2 <1.2 <1.0 <1.0 <0.68 etra ydro uran 75 <1.1 <1.4 < .3 <1.2 <1.2 <1.0 <1.0 <0.68 !oro orm <0.5 <1.1 <1.4 <1.3 <1.2 <1.2 <1.0 <1.0 <0.68 1 1 _ nrt nrnathane < .5 <1. <1.4 <1. <1.2 < .2 <1. <1.0 <0.68