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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -7S <br />Sample Type: Air <br />Sampling Date 6/20/06 11/14/06 4/13/07 8/31/07 1124/08 4/14/08 7/30/08 1/24/09 7/10/09 1118/10 5/14/10 7/16/10 7/28/11 415/12 8/6/12 1/30113 4112113 7/26/13 10/25/13 <br />Monitoring 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 0 0 0.0 <br />Carbon Dioxide (percent) NT NT 0.8 2.1 0.9 0.5 2.5 0.9 0.7 0.7 0.6 1.4 2.5 1.3 14.4 1.3 1.6 1.8 1.3 <br />Oxygen (percent) NA NA NA NA NA NA 17.4 19.7 15.9 18.2 19.9 18.3 17.0 18.9 3.1 18.8. 19.0 18.8 20.2 <br />NA <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 />C:\Corral Hotlow\4th Quarter 2013\CH-Hist 4th Q 2013.xism Printed: 1/27/2014 <br />