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HISTORICAL SUMMARY OF ANALYTICAL RESULTSUNSATURATED ZONE AIRNORTH COUNTY SANITARY LANDFILLSG-5Sample Type: AirSampling 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 1/29/101,1,2-Trichloroethane <0.5 <0.5121<0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <1.21,1,1-Trichloroethane <0.5 <0.5 <0.51.1<0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <1.2Trichloroethene <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 <1.2Trichlorofluoromethane (Freon 11)1.7 12 16 30 8 23 16 12 4.9 2.4 4.5 4.1 1.4NT5.8 51,3,5-Trimethylbenzene <0.58.7<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 <1.21,2,4-Trimethylbenzene <0.514 1.4 1.4<0.5 <0.5 <0.5 <0.5 <0.5 <0.51.3<1.0 <1.2 NT <1.1 <1.22,2,4-Trimethylpentane NT NT NT NT NT NT NT NT NT <0.05 <1.1 <1.0 <1.2 NT <1.1<1.2Vinyl Chloride <0.5 <0.51 7.2<0.5 <0.5146 130<0.5 <0.5 <1.1 <1.0 <1.2 NT <1.1 <1.2m/p Xylene <0.531<0.5 <0.51.3<0.5 <0.5 <0.5 <0.5 <0.51.4 1.7<1.2 NT <1.1 <1.2o-Xylene <0.54.6<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 <1.2NR = Not RequiredNT = Not Tested* = Trace Concentration{1} Parameter also detected in one or more quality control blanks.117 of 146