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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br /> UNSATURATED ZONE SOIL GAS <br /> FOOTHILL SANITARY LANDFILL <br /> SG-T <br /> Sample Type:Air <br /> Sampling Date 2/19/04 5/6/04 7/22/04 11/15/04 2/11/05 10/3/05 6/30/06 <br /> Monitoring and Field Parameters <br /> Methane oncentration(percent) 0 0 2.1 0 0.4 04.2 <br /> ar on Diox ei percent) N T T N N N T <br /> Oxygen(percent) NT NT <br /> Volatile Organic Compounds PPB(v/v) <br /> Freon 12 9.9 <0.5 2588 5.3 2457 8.7 1800 <br /> _Freon 114 3.0 <0.5 247 <0.5 186 <0.5 <0.5 <br /> loromet ane 3.3 1.0 43 0.9 <0.5 <0.5 <0.5 <br /> Vinyl_ Londe 2.4 <0.5 1 <0.5 <0.5 <0.5 < .5 <br /> 1,3-Butadiene _ NT NT NT NT NT NT NT <br /> Bromomethane 2.6 <0.5 <0.5 <0.5 <0.5 35 35 <br /> Chloroet ane 2.5 <0.5 < .5 <0.5 <0.5 <0.5 <0.5 <br /> Freon 11 3.4 0.9 1483 18 2939 13 1000 <br /> Ethanol NT NT NT NT NT NT NT <br /> Freon 113 2.1 <0.5 191.0 0.9 238 <0.5 <0.5 <br /> 1�tiforoethene 1.8 <0.5 2.8 <0.5 <0.5 <0.5 <0.5 <br /> Acetone <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 2-Propanol NT NT NT NT NT NT NT <br /> Carbon Disulfide NT NT NT NT <0.5 <0.5 <0.5 <br /> 3-Chloropropene NT NT NT NT NT NT NT <br /> Methylene Chloride 16 39.0 3.9 <1.0 8.7 <1.0 <1.0 <br /> Methyl tert-butyl ether NT NT NT NT NT NT NT <br /> trans-1,2-Dichloroethene NT NT NT NT NT NT NT <br /> Hexane <br /> <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <br /> 1,1-6ich oroet ane 1.7 <0.5 1.1 <0.5 9.1 <0.5 <0.5 <br /> 2-Butanone(Methyl Ethyl Ketone) NT NT NT NT NT NT NT <br /> cis-1,2-Dicethene <0.5 <0.5 <0.5 < .5 <0.5 <0.5 < .5 <br /> h <0Tetrarfu .5 <br /> -chloro ori 1.8 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br /> 1,1T-Trichloroethane 1.8 <0.5 47 2.7 169 <0.5 <0.5 <br />