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HISTORICAL SUMMARY OF ANALYTICAL RESULTSUNSATURATED ZONE AIRNORTH COUNTY SANITARY LANDFILLSG-2 IntermediateSample Type: AirSampling Date 9/29/03 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 1/29/10Tetrahydrofuran NT NT NT NT NT NT NT NT NT <0.057.7 4.2<1.2 <1.0 <1.2 <1.1Toluene <0.58.6<0.51.3 1.4<0.5 <0.5 <0.5 <0.5 <0.5 <1.12.5<1.22.4<1.2 <1.11,2,4-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 <4.9 <4.2 <4.8 <4.41,1,2-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 <1.0 <1.2 <1.11,1,1-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.0 <1.2 <1.1Trichloroethene <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 <1.0 <1.2 <1.1Trichlorofluoromethane (Freon 11)6.2 7.6<0.532 34 108 2.1<0.5 <0.5 <0.5 <1.12.6 3.8 3 5.8 4.81,3,5-Trimethylbenzene <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.0 <1.2 <1.11,2,4-Trimethylbenzene <0.51.1<0.51.4<0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.0 <1.2 <1.12,2,4-Trimethylpentane NT NT NT NT NT NT NT NT NT <0.05 <1.11.1<1.2 <1.0 <1.2 <1.1Vinyl Chloride <0.5 <0.5 <0.5 <0.5 <0.54.9<0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.2 <1.0 <1.2 <1.1m/p Xylene <0.52.1<0.52.2 1.1<0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.21.2<1.2 <1.1o-Xylene <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 <1.0 <1.2 <1.1NR = Not RequiredNT = Not Tested* = Trace Concentration{1} Parameter also detected in one or more quality control blanks.103 of 146