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nw i urtwt,� aummran r ur HwAL r I wAL neauL t o <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -3S <br />Sample Type: Air <br />Sampling Date 4/13/07 8/31107 1/24/08 4/14/2008 7/30/06 1/24/09 7/10/09 1/18/10 5/14/10 7/16/10 1/17/11 7/28/11 4/5/12 8/6/12 <br />Monitorinu and Field Parameters <br />Methane Concentration (percent) 0.0 0.0 0.0 0 0 0 0 0 0 0 0 0 0 0 <br />Carbon Dioxide (percent) 0.5 0.6 0.5 0.6 1.0 O.4 0.5 0.3 0.7 0.6 0.4 0.7 0.5 0.6 <br />Oxygen percent) NA NA NA NA 18.2 20.0 16.4 18.7 20.1 19.3 19.5 19.2 19.7 20.3 <br />NA = Not Available <br />Trace Concentration <br />(1) Parameter also detected In one or more quality control blanks. <br />GW -3S; Po19/2013 0 1 of 1 <br />