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A �! A A A A® A AA A AA A AA IA <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />Sample Type: Arc SG4 Intermediate <br />Sampling Date 11/14/03 2/12104 5!7/04 7/27/04 11/9/04 2/10/05 9/30/05 <br />MonMnn 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 -8, Int; Printed: 1/25/2006 15 of 17 <br />