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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-8 <br /> Sample Type:Air <br /> Sampling Date 1/29/08 7/29/08 1/23/09 7/15/09 3/2/10 8/7/12 1/28/13 <br /> Monitoring and Field Parameters <br /> Methane Concentration (percent) 0 0 0 0 0 NM N <br /> Oarbon Dioxide (percent) 0.9 0.5 1.6 0.7 2 NM N <br /> Oxygen (percent) 17.6 18.5 16.5 19.4 19 N <br /> Volatile Organic Compounds PPB NN) <br /> Freon 12 1300 260 1300 500 440 NS NS <br /> Freon 114 <0.5 9.6 <160.0 16 <58 NS NS <br /> h oromet ane <0.5 <4.1F <650. <6.3 <230 NS NS <br /> -Viny C lobi e <0.5 <1.0 <160.0 <1. <58 NS NS <br /> 1,3-Butadiene NT <1.0 <160.0 <1.6 <58 NS NS <br /> Bromomethane <0.5 <1.0 <160.0 <1.6 <58 NS NS <br /> Ch Ior6e-t-Kane <0.5 <1.0 <160.0 <1.6 <58 NS NS <br /> Freon 11 880 220 960 400 430 NS NS <br /> Ethanol NT 18 <650.0 <6.3 <230 NS NS <br /> Freon 113 <0.5 11 <160.0 13 <58 NS NS <br /> 1,1-Dichloroethene <0.5 13 <160.0 <1.6 110 NS NS <br /> Acetone _ <0.5 18 <650.0 8 <230 NS NS <br /> 2-Propanol NT <4.1 <650.0 <6.3 <230 NS NS <br /> Carbon Disulfide <0.5 <1.0 <160.0 <1.6 <58 NS NS <br /> 3-Chloropropene NT <4.1 <650.0 <6.3. <230 NS NS <br /> Methylene Chloride <1.0 1.6 <160.0 <1.6 <58 NS NS <br /> Methyl tert-butyl ether NT <1.0 <160.0 <1.6 <58 NS NS <br /> trans-1,2-Dichloroethene NT <1.0 <160.0 <1.6 <58 NS NS <br /> Hexane <1.0 <1.0 <160.0 <1.6 <58 NS NS <br /> 1,1-Dic-chloroethane <0.5 < .0 <160.0 <1.6 <58 NS NS <br /> 2-Butanone (Methyl Ethyl Ketone) NT 3.8 <160.0 <1.6 <58 NS NS <br /> cis=1 =Dic ohT roet eilne- < < < < < NS NS <br /> TetrahydrsVunan <0.5 1.2 <160.0 <1.6 <58 NS NS <br /> Chloroform <0.5 <1.0 <160.0 <1.6 <58 NS NS <br /> 1,1,1-Trichloroethane NT <1.0 <160.0 2 <58 NS NS <br />