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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 11/9/04 2/10/05 9/30/05 6/26/06 11/18/06 3/2/07 9/5/07 3/11/08 7/28/08 1/23/09 7/14/09 1/29/10 <br />1,1,2-Trichloroethane <0.5 <0.5 1 21 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <1.2 <br />1,1,1-Trichloroethane <0.5 <0.5 <0.5 1.1 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <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 NT <1.1 <1.2 <br />Trichlorofluoromethane (Freon 11)1.7 12 16 30 8 23 16 12 4.9 2.4 4.5 4.1 1.4 NT 5.8 5 <br />1,3,5-Trimethylbenzene <0.5 8.7 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <1.2 <br />1,2,4-Trimethylbenzene <0.5 14 1.4 1.4 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 1.3 <1.0 <1.2 NT <1.1 <1.2 <br />2,2,4-Trimethylpentane NT NT NT NT NT NT NT NT NT <0.05 <1.1 <1.0 <1.2 NT <1.1 <1.2 <br />Vinyl Chloride <0.5 <0.5 1 7.2 <0.5 <0.5 146 130 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <1.2 <br />m/p Xylene <0.5 31 <0.5 <0.5 1.3 <0.5 <0.5 <0.5 <0.5 <0.5 1.4 1.7 <1.2 NT <1.1 <1.2 <br />o-Xylene <0.5 4.6 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <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 />22 of 48