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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -4M <br />Sample Type: Air <br />Sam lin Dale 6/20/06 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 />Monitorina and Field Parameters <br />Methane Concentration (percent) 0.0 0.0 0.0 0 0 0 0 0 0 0 0 0 0 <br />Carbon Dioxide (percent) NT 0.0 0.0 0.1 0.1 0.1 0.1 0.0 0.0 0.2 17.2 0.0 0.2 <br />Oxygen (percent) NA NA NA NA NA 18.3 17.6 15.9 14.6 20.7 82.8 16.3 14.4 <br />NA - Not Available <br />Only parameters detected In one or more samples are listed. <br />= Trace Concentration <br />(1} Parameter also detected In one or more quality control blanks. <br />GW -4M; Printed: 4/9/2012 1 of 1 <br />