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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG -1 Deep <br />Sample Type: Air <br />Sampling Date 9/29/03 02/1104 517/04 7/22/04 11/6/04 2110/05 9/29/05 <br />Monitoring and Field Parameters <br />Methane Concentration(percent) 0 <br />Carbon Tetrachloride <, <, <.5 <, <, <0, <, <br />Chlorobenzene <, <, <, <. <, <, <, <br />Chkxoethane <, <, <,5 <, <, <, <, <br />Chloroform < <0, <0.5 < < <0, <0. <br />4riorobenzene .3 <1.0 <1.0 < <1.0 <11.0 <1.0 <br />6h oroe ane <0.5 <0.5 <0.5 <0.5 <0. <0.5 <br />- rich oroethane < . < . <0.-s <0.5 <0. <0. <0. <br />1,1,i -Trichloroethane <br /><. < <, <, <1.0 0.0 < <br />Tdchlomfluoromethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.6 <0, <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, Deep; Printed: 1/25/2006 3 of 17 <br />