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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 5/7/04 7/22/04 11/9/04 2/10/05 9/30/05 6/26/06 11/18/06 3/2/07 9/5/07 3/11/08 7/28/08 1/30/09 7/14/09 1/29/10 <br />Tetrahydrofuran NT NT NT NT NT NT NT NT NT <0.05 12 <1.0 <1.2 <1.1 <1.3 <1.2 <br />Toluene <0.5 5.5 7.7 <0.5 1.9 <0.5 <0.5 <0.5 <0.5 <0.5 5.4 3.2 <1.2 1.2 <1.3 <1.2 <br />1,2,4-Trichlorobenzene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <4.6 <4.0 <4.7 <4.5 <5.3 <4.8 <br />1,1,2-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />1,1,1-Trichloroethane <0.5 <0.5 2.7 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />Trichloroethene <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />Trichlorofluoromethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />1,3,5-Trimethylbenzene <0.5 <0.5 <0.5 <0.5 0.9 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />1,2,4-Trimethylbenzene <0.5 1.2 1.4 1.2 1.3 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />2,2,4-Trimethylpentane NT NT NT NT NT NT NT NT NT <0.05 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />Vinyl Chloride <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />m/p Xylene <0.5 2.1 2.3 2.2 4.7 <0.5 <0.5 <0.5 <0.5 <0.5 2.3 1.4 <1.2 <1.1 <1.3 <1.2 <br />o-Xylene <0.5 <0.5 <0.5 <0.5 1.3 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.1 <1.3 <1.2 <br />NR = Not Required <br />NT = Not Tested <br /> J = Trace Concentration <br />{1} Parameter also detected in one or more quality control blanks. <br />36 of 48