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i i i 11 i i i i <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -8 Deep <br />Sample Type: Air <br />Sampling Date 11/14/03 2/12/04 517/04 7/22/04 11/9/04 2/10/05 9/30/05 <br />Monitoring and Field Parameters <br />Methane Concentration(percent) 0 0 0 0 0 0 0 <br />Volatile Organic Compounds PPB (v/v) <br />Benzene <0.5 <0.5 <0.5 <0.5 <0.6 <0.5 <0. <br />Not equire <br />NT = Not Tested <br />* = Trace Concentration <br />11) Parameter also detected in one or more quality control blanks. <br />SG -8, Deep; Printed: 1/25/2006 16 of 17 <br />