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NA =Not Av flable <br />• =Trace Concentration <br />{1) Parameter also detected In one or more quality control blanks <br />GW -2M; Printed: 7/28/2014 1 of 1 <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -2M <br />Sampie Type: Air <br />Sampling Date <br />4/13/07 8131!07 1/24/08 4/14/2008 7/30/08 1/24/09 7/10109 1/78/10 5/14/70 7/16/10 1/17/11 <br />7/28/11 <br />4/5/12 816/12 1130/13 1/31/14 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) <br />Carbon Dioxide (percent) <br />0.0 _ 0.0 0_ 0 0 0 0 0 0 _ 0_ o <br />0 <br />0 0 0 0 <br />0.1 0.2 3.9 2.1 <br />2.6 0.0 3.5 3 1.4 0.5 0.1 2.7 0.3 2.5 2.1 <br />0.1_ <br />O rygmn percent) __ <br />NA NA NA NA 18.6 20.0 16.7 16.7 20_4 17.4 18.3 <br />20.2 <br />19.9 20.4 17.6 19.4 <br />NA =Not Av flable <br />• =Trace Concentration <br />{1) Parameter also detected In one or more quality control blanks <br />GW -2M; Printed: 7/28/2014 1 of 1 <br />