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uv" UNSATURA7EDZONE SOIL GAS `� V <br />CORRAL HOLLOW LANDFILL <br />GW -6S <br />Sample Type: Air <br />Sampling Date 4/13/07 8/31/07 1/24/08 04/14/08 7/30/08 1/24/09 7/10/09 1/18/10 5/14/10 7/16/10 1/17/11 7/28111 <br />Monitorina and Field Parameters <br />Methane Concentration (percent) 0.0 0.0 0.0 0 0 0 0 0 0 0 0 0 <br />Carbon Dioxide (percent) 1.6 1.3 5.4 3.2 1.6 3.2 0.1 9.2 1.9 1.3 1.0 1.8 <br />Oxygen (percent) NA NA NA NA 18.5 16.9 16.6 6.2 17.2 18.7 18.3 17.5 <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 />O:\San Joaquin County\Corral Hollow LF\GMR\1st Quarter 2012\CH-Hist.xlsm Printed: 4/9/2012 <br />