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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SO -3 Shallow <br />Sample Type: Air <br />Sampling Date 11/14/03 2/12/04 517/04 7/22/04 11/8/04 2/10/05 9/29/05 <br />Monitoring and Field Parameters <br />Methane Concentration percent <br />Not equire <br />NT = Not Tested <br />* = Trace Concentration <br />(1) Parameter also detected in one or more quality control blanks. <br />SG -3, Shal; Printed: 1/25/2006 7 of 17 <br />