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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG-2 Shallow <br />Sample Type: Air <br />Sampling Date 11/14/03 2/12/04 5/7/04 7/22/04 11/8/04 2/10/05 9/29/05 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 />Toluene <0.5 8.9 7.9 1.6 1.3 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <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 <4.8 <5.1 <4.6 <4.7 <4.4 <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 <1.2 <1.3 <1.1 <1.2 <1.1 <br />1,1,1-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />Trichloroethene <1.0 <1.0 1.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />Trichlorofluoromethane (Freon 11)6.8 24 4.4 27 32 114 <0.5 <0.5 <0.5 <0.5 1.2 1.4 <1.3 1.2 4.7 3.5 <br />1,3,5-Trimethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />1,2,4-Trimethylbenzene <0.5 1.2 3.4 1.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />2,2,4-Trimethylpentane NT NT NT NT NT NT NT NT NT <0.05 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />Vinyl Chloride <0.5 <0.5 <0.5 <0.5 <0.5 8.6 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />m/p Xylene <0.5 2.3 1.1 2.9 1.1 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <br />o-Xylene <0.5 <0.5 <0.5 1.4 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.2 <1.3 <1.1 <1.2 <1.1 <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 />6 of 48