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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />OW -2M <br />Sample Type: Air <br />Sampling Date 4/13/07 8/31/07 1/24/08 4/14/2008 7/30/08 1/24/09 7/10/09 1/18/10 5/14/10 7/16/10 1/17/11 7/28/11 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) 0.0 0.0 0 0 0 0 0 0 0 0 0 0 <br />Carbon Dioxide (percent) 2.6 0.0 3,5 3 1.4 0.5 0.1 2.7 0.3 2.5 2.1 0.1 <br />Oxygen (percent) NA NA NA NA 18.8 20.0 16.7 16.7 20.4 17.4 18.3 20.2 <br />= Trace Concentration <br />(1) Parameter also detected In one or more quality control blanks. <br />GW -2M; Printed: 4/9/2012 1 oft <br />0 <br />