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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -1 Shallow <br />Sample Type: Air <br />Sampling Date 11/14/03 2/11/04 5/7/04 7/22104 11/8/04 2/10/05 9/29/05 <br />Monitoring and Field Parameters <br />Methane Concentration (percent) 0 0 0 0 0 <br />Carbon Tetrachloride <, <, <.5 <, <,5 <,5 <, <br />Chloro, nzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <br />Chloroethane <, <, <, <. <.5 <, <.5 <br />oroet ane <0.5 <0.5 <0.5 <0, <0.5 <0.5 <0.5 <br />Trichlorofluoromethane < . <0. <0.5 <0.5 <0.5 <0.5 <0.5 <br />Not equire <br />NT = Not Tested <br />* = Trace Concentration <br />(1} Parameter also detected in one or more quality control blanks. <br />SG -1, Shal; Printed: 1/25/2006 1 of 17 <br />