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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -5 <br />Sample Type: Air <br />Sampling Date 9/29/03 2/11/04 5/7/04 7/22/04 11/9104 2/10/05 9/30/05 <br />Monitoring and Field Parameters <br />Methane Concentration(percent) 0 0 4. <br />Carbon Tetrachloride <0.5 <0.5 <0.5 < <0. <0.5 <0.5 <br />Chlorobenzene <, <. <. <. <. <, <0.5 <br />ChlorDethane <, <, <, < <, <. <.5 <br />Chloroform <0.5 <0.5 <0.5 <0.5 <0.6 <0.5 <br />Required <br />NT = Not Tested <br />= Trace Concentration <br />{1} Parameter also detected in one or more quality control blanks. <br />SG -5; Printed: 1/25/2006 11 of 17 <br />