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UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -2S <br />Sample Type: Air <br />Sampling Date 4/13/07 8/31/07 1/24/08 4/14/2008 7130108 1/24/09 7110/09 1/18/10 5114/10 7116/10 1117111 7/28111 4/5/12 8/6112 1/30/13 1131/14 <br />Monitoring and Field Parameters <br />Methane Concentrationep rcentj 0.0 0.0--__0 0 0 0 0 0 0 _0 0 0 0 0 0 0 <br />Carbon Dioxide {percent) 0.9 1.6 0.9 0.3 1.1 0.8 1.0 0.5 0.7 0.6 0.5 1.2 0.6 0.9 0.7 0.4 <br />Oxygen (percent) NA NA NA NA 18.3 _19.9_ 15.6 18.3 19.5 19.5 19.3 176 19.6 19.5 18.6_ 20.4 <br />" = Trace Concentration <br />{1] Parameter also detected in one or more quality control blanks <br />GW -2S; Printed: 7/28/2014 1 of 1 <br />® ® ® M M M ® M ® ® ® M M _.._® ..___.._�_--- __ � ,....__... _-____® I M <br />