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_ _HIST SUM OF AN CAL RESULTS <br />UNSATURATED ZONE SOIL GAS <br />FOOTHILL SANITARY LANDFILL <br />SG -12D <br />Sample Type: Air <br />Sampling Date 7/22/04 11/17/06 2/14/05 10/3/05 3113/07 <br />Monitorina and Field Parameters <br />Methane Concentration(percent) 0 0- — <br />Carbon Diox a percent -- NT NT NT— 0.7 <br />Required <br />NT = Not Tested <br />" = Trace Concentration <br />{1} Parameter also detected in one or more quality control blanks. <br />SG -12D; Printed: 7/20/2007 12 of 15 <br />