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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -3D <br />Sample Type: Air <br />Sampling Date 6/20/06 11/14/06 2/26/07 4/13107 8/31/07 1/24/08 4/14/2008 7/30/08 1/24/09 7/10/09 1/18110 5/14/10 7/16/10 1/17/11 7128/11 <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 0 0 0 0 <br />Carbon Dioxide (percent) NA NA 4.5 2.2 1.7 7.6 1.5 1.4 2.1 0.2 7.8 0.4 0.9 1.1 1.1 <br />Oxygen (percent) NA NA NA NA NA NA NA 18.6 19.3 16.7 15.8 20.1 19.1 19.4 18.9 <br />NA - Not Available <br />- Trace Concentration <br />(1) Parameter also detected in one or more quality control blanks <br />GW -3D; Printed: 4/9/2012 1 of 1 <br />