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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -10 Sample Type: Air Samplina 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 4/12/12 8/7/12 Monitoring and Field Parameters Methane Concentration (percent 3 1.7 0 0 0 0 0 0 Carbon Dioxide (percent) 2.5 2.8 5 4.5 5.9 3.6 4.1 4.1 2.8 3 Oxvoen (percent) 12.3 11.9 0 0.6 3 10 8.5 6.5 14.2 13.1 Volatile Organic Compounds PPB (v/v) Freon 12 Freon 114 220 45 230 87 1300 290 1000 230 890 190 350 83 360 87 100 24 1000 240 510 120 Chloromethane <0.5 23 <29 <20 <12 <4.4 <4.5 <4.9 <3 <6.3 Vinyl h ori a <0.5 <1.2 140 19 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 1,3 -Butadiene NT <1.2 <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 Bromomethane <0.5 1.5 <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <32 <16 �h�roethane < .5 4 <7. <5. <3. <1,f < A <4.9 <13 <6.3 Freon 11 Ethanol Freon 113 1,1-Dichloroethene 6.3 NT <0.5 <0.5 10 <4.8 <1.2 <1.2 28 <29 <7.2 10 24 <20 <5.0 <5.0 28 <12 <3.0 <3.0 9.2 <4.4 <1.1 <1.1 10 17 <1.1 <1.1 3.3 19 <1.2 <1.2 27 <13 <3.2 <3.2 14 <6.3 <1.6 <1.6 Acetone 8.3 35 <29 <20 14 <4.4 <4.5 9.8 <32 <16 2 -Propanol NT <4.8 <29 <20 <12 <4.4 <4.5 <4.9 <13 <6.3 Carbon Disulfide <0.5 <1.2 <7.2 <5.0 <3.0 <1.1 <1.1 <4.9 <13 <6.3 3-Chloropropene NT <4.8 <29 <20 <12 <4.4 <4.5 <4.9 <13 <6.3 Methylene Chloride <1.0 1.5 <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <32 <16 Methyl tert-butyl ether trans-1,2-Dichloroethene NT NT <1.2 <1.2 <7.2 <7.2 <5.0 <5.0 <3.0 <3.0 <1.1 <1.1 <1.1 <1.1 <1.2 <1.2 <3.2 <3.2 <1.6 <1.6 Hexane <1.0 <1.2 26 <5.0 <3.0 <1.1 <1.1 <1.2 4.2 <1.6 1,1-Dichloroethane <0.5 <1.2 <7.2 <5.0 <3.0 <1. <1.1 <1.2 <3.2 <1.6 2-Butanone (Methyl Ethyl Ketone) cis- 1,2-Dichloroethene 6 <0.5 4.2 <1.2 <7.2 <7.2 <5.0 <5.0 <3.0 <3.0 <1.1 <1.1 <1.1 <1.1 <4.9 <1. <13 <3.2 <6.3 <1.6 Tetrahydro uran 120 <1.2 <7.2 <5. <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 hloro orm <0.5 1.3 <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 1,1,1- rich oroethane <0.5 <1. <7.2 <5. <3. <1.1 <1.1 <1.2 <3.2 <1.6 r� U