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w® w w w w w ww ww ww ® ww ww w w <br />HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -7 <br />Sample Type: Air <br />Sampling Date 9/29/03 2/11/04 5/7/04 7/22/04 11/9/04 2/10/05 9/30/05 <br />Monitoring and Field Parameters <br />Methane oncentra 'on percent) 0 <br />Carbon Tetrachloride <0.5 <0.5 <0.6 <0.5 <0.5 <0.5 <0.5 <br />Not equire <br />NT = Not Tested <br />= Trace Concentration <br />11) Parameter also detected in one or more quality control blanks. <br />SG -7; Printed: 1/25/2006 13 of 17 <br />