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M ® ® ® M M M M M M ® ® ® ® r w M HISTORICAL SUMMARY OF ANALYT UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG-10 Sample Type:Air Sampling Date 1/23/09 7/15/09 3/2/10 9/3/10 1/25/11 7/29/11 4/12/12 8/7/12 1/28/13 9/11/13 3/18/14 Monitoring and Field Parameters Methane Concentration(percent) 3 1.7 0 0 0 0 0 0 0 0.1 0 Carbon Dioxide(percent) 5 4.5 5.9 3.6 4.1 4.1 2.8 3 4.2 3.9 5.4 Oxygen (percent) 0 0.6 3 10 8.5 6.5 14.2 13.1 10.7 11.7 5.4 Volatile Organic Compounds PPB(v/v) Freon 12 1300 1000 890 350 360 100 1000 510 410 500 620 Freon 114 290 230 190 83 87 24 240 120 100 120 150 Chloromethane <29 <20 <12 <4.4 <4.5 <4.9 <32 <6.3 <22 <20 <15 Vinyl Chloride 140 19 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 4.7 1,3-Butadiene <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Bromomethane <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <32 <16 <22 <20 <39 Chloroethane <7.2 <5.0 <3.0 <1.1 <1.1 <4.9 <13 <6.3 <8.8 <7.9 <15 Freon 11 28 24 28 9.2 10 3.3 27 14 11 12 16 Ethanol <29 <20 <12 <4.4 17 19 <13 <6.3 <8.8 12 <15 Freon 113 <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 1,1-Dichloroethene 10 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Acetone <29 <20 14 <4.4 <4.5 9.8 <32 <16 <22 <20 <39 2-Propanol <29 <20 <12 <4.4 <4.5 <4.9 <13 <6.3 <8.8 <7.9 <15 Carbon Disulfide <7.2 <5.0 <3.0 <1.1 <1.1 <4.9 <13 <6.3 <8.8 <7.9 <15 3-Chloropropene <29 <20 <12 <4.4 <4.5 <4.9 <13 <6.3 <8.8 <7.9 <15 Methylene Chloride <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <32 <16 <22 <20 <39 Methyl tert-butyl ether <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 trans-1,2-Dichloroethene <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Hexane 26 <5.0 <3.0 <1.1 <1.1 <1.2 4.2 <1.6 <2.2 <2.0 <3.9 1,1-Dichloroethane <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 2-Butanone(Methyl Ethyl Ketone) <7.2 <5.0 <3.0 <1.1 <1.1 <4.9 <13 <6.3 <8.8 <7.9 <15 cis-1,2-Dichloroethene <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Tetrahydrofuran <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Chloroform <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 1,1,1-Trichloroethane <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Cyclohexane 46 28 <3.0 <1A <1.1 <1.2 13 <1.6 <2.2 <2.0 <3.9 Carbon Tetrachloride <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 2,2,4-Trimethylpentane 24 11 <3.0 <1.1 <1.1 <1.2 3.6 <1.6 <2.2 <2.0 <3.9 Benzene <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 1,2-Dichloroethane <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Heptane 28 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 Trichloroethene 170 88 7.4 2.2 4.3 <1.2 100 5.9 12 7.6 10 1,2-Dichloropropane <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 1,4-Dioxane <29 <20 <12 <4.4 <4.5 <4.9 <13 <6.3 <8.8 <7.9 <15 Bromodichloromethane <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9 cis-1,3-Dichloropropene <7.2 <5.0 <3.0 <1.1 <1.1 <1.2 <3.2 <1.6 <2.2 <2.0 <3.9