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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -10 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 Monitoring and Field Parameters Methane Concentration (percent) 0 0 3 1.7 0 0 0 Carbon Dioxide (percent) 2.5 2.8 5 4.5 5.9 3.6 4.1 Oxvaen (percent) 12.3 11.9 0 0.6 3 10 8.5 Volatile Oraanic Compounds PPB (v/v Freon 12 220 230 1300 1000 890 350 360 Freon 114 45 87 290 230 190 83 87 Chloromethane <0.5 23 <29 <20 <12 <4.4 <4.5 my hloride <0.5 <1.2 140 19 <3.0 <1.1 <1.1 1,3 -Butadiene NT <1.2 <7.2 <5.0 <3.0 <1.1 <1.1 Bromomethane <0.5 1.5 <7.2 <5.0 <3.0 <1.1 <1.1 Chloroethane <0.5 4 <7.2 <5. < <1.1 <1. 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 Acetone 8.3 35 <29 <20 14 <4.4 <4.5 2 -Propanol NT <4.8 <29 <20 <12 <4.4 <4.5 Carbon Disulfide <0.5 <1.2 <7.2 <5.0 <3.0 <1.1 <1.1 3-Chioropropene NT <4.8 <29 <20 <12 <4.4 <4.5 Methylene Chloride <1.0 1.5 <7.2 <5.0 <3.0 <1.1 <1.1 Methyl Cert -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 Hexane <1.0 <1.2 26 <5.0 <3.0 <1.1 <1.1 1,-Dichioroethane <0.5 <1.2 <7.2 <5.0 <3.0 <1.1 <1.1 2-Butanone (Methyl Ethyl Ketone) 6 4.2 <7.2 <5.0 <3.0 <1.1 <1.1 cis-1.2-Dic loroethene <0.5 <1.2 <7.2 <5.0 <3. <1.1 <1.1 etrahydro uran 120 < <7.2 <5. <3.0 < <1.1 loro orm <0.5 1.3 <7.2 <5.0 <3. <1. <1.1 1,1,1 -Trichloroethane <0.5 <1.2 <7.2 <5.0 <3. <1.1 <1.1