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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />CORRAL HOLLOW LANDFILL <br />GW -7M <br />Sample Type: Alr <br />Sain, in', Date 2/26107 4/13/07 8131/07 1/24/08 04/14/08 7/30/08 1/24/09 7/10/09 1/18/10 5/14/10 7/16110 7/28/11 <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 <br />Carbon Dioxide (percent) 6.9 7.2 3.5 4.2 0.4 8.7 10.3 - 9.0 8.9 0.4 2.9 4.4 <br />Oxygen (percent) NA NA NA NA NA 0.8 4.9 0.0 8.8 16.9 9.8 4.9 <br />NA - Not Available <br />Only parameters detected in one or more samples are listed. <br />z Trace Concentration <br />(1) Parameter also detected in one or more quality control blanks. <br />0:\San Joaquin County\Corral Hollow LF\GMR\i st quarter 2012\CH-Hlst.xlsm Printed: 4/9/2012 <br />