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GW -4S; Primed: 7/28/2014 <br />® M <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -4S <br />Sample Type: Air <br />Sampling Date 2126/07 4113/07 8131107 1/24/08 4/14/2008 7130/08 1124/09 7/10109 1118110 5/14/10 7/16110 1117/11 7128/11 4/5/12 8/6/12 1/30113 1/31/14 <br />Nignitgring_and Fieid-Parameters <br />---- <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 0.0 0.00.0 0 _ <br />carbon_bioxide (Percent) 0.1_ 0.2 0.1 0.3 0.2 0.4 0.1 __ 0_0 0.0 0.1 19.9 0;0 _ 0_1 0.2 0.2 0.1 0.2 <br />_Oxygen percent) NA_ NA NA NA NA 18.9 20.8 0,0 18.9 20_7 80.1 19.9 19_.5 19.1 20.4 20.1 _20.6 <br />NA = Not Available <br />Only parameters detected in one or more samples are listed. <br />= Trace Concentration <br />{11 Parameter also detected in one or more quality control blanks - <br />® ® M M M ® M <br />loft <br />