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HISTORICAL SUMMARY OF ANALYTICAL RESULTS UNSATURATED ZONE SOIL GAS FOOTHILL SANITARY LANDFILL SG -11 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 12 440 420 1300 790 650 210 350 230 620 Freon 114 130 180 370 230 180 75 110 81 190 Chloromethane <0.5 <8.8 <19 <12 <8.8 <4.4 <4.1 <4.8 <23 1.3 -Butadiene NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 Bromomethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <23 Chloroethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <4.8 <9.2 Freon 11 4.1 2.3 8.5 4.7 6.2 1.4 2.6 1.7 4.4 Ethanol <4.6 <8.8 <19 <12 <8.8 7.0 8.0 100 <9.2 Freon 113 <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 1.1-Dichloroethene 7 30 82 45 9.1 <1.1 <1.0 9.0 24 Acetone <0.5 18 <19 <12 <8.8 9 <4.1 <4.8 <23 2 -Propanol <4.6 <8.8 <19 <12 <8.8 <4.4 <4.1 <4.8 <9.2 Carbon Disulfide <0.5 <2.2 <4.7 <2.9 <2.2 1.9 <1.0 <4.8 <9.2 3-Chloropropene NT <8.8 <19 <12 <8.8 <4.4 <4.1 <4.8 <9.2 Methylene Chloride <1.0 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <23 Methyl tert-butyl ether NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 trans-1,2-Dichloroethene NT <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 Hexane <1.0 6.4 14 7.1 2.2 <1.1 <1.0 1.2 3.5 1,1-Dichloroethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 2-Butanone (Methyl Ethyl Ketone) 3.5 6.1 <4.7 <2.9 <2.2 1.4 <1.0 <4.8 <9.2 cis-1,2-Dichloroethene <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 <1.0 <1.2 <2.3 T..�..�h...JmA,..,., AA <9 9 <a 7 <2 9 <2.2 <1.1 <1.0 <1.2 <2.3 1,1,1 -Trichloroethane <0.5 <2.2 <4.7 <2.9 <2.2 <1.1 Cvclohexane 3.5 10 14 8.3 <2.2 <1.1 <1.0 <1.2 <1.0 <1.2 <1.0 1.3 <2.3 <2.3 3.5