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HISTORICAL SUMMARY OF ANALYTICAL RESULTSUNSATURATED ZONE AIRNORTH COUNTY SANITARY LANDFILLSG-7Sample 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 1/29/10Tetrahydrofuran NT NT NT NT NT NT NT NT NT <0.0511<1.0 <1.1 NT <1.1 <1.1Toluene <0.513 9<0.52.3<0.56.1 2.4<0.5 <0.51.4<1.0 <1.1 NT <1.1 <1.11,2,4-Trichlorobenzene1.1*<0.5 <0.5 <0.5 <0.5 <1.0 <1.0 <1.0 <1.0 <1.0 <4.6 <4.0 <4.5 NT <4.6 <4.51,1,2-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 <1.1 NT <1.1 <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 <1.1 NT <1.1 <1.1Trichloroethene <1.0 <1.01.2*<1.01.7<1.0 <1.0 <1.0 <1.0 <1.0 <1.1 <1.0 <1.1 NT <1.1 <1.1Trichlorofluoromethane (Freon 11) <0.5 <0.5 <0.5 <0.5 <0.5 <0.52.2<0.5 <0.5 <0.5 <1.15.4<1.1 NT9.8 161,3,5-Trimethylbenzene <0.5 <0.51.6 1.7 1.0<0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.1 NT <1.1 <1.11,2,4-Trimethylbenzene <0.5 <0.52.9 3.4 1.4 10<0.51.5<0.5 <0.5 <1.1 <1.0 <1.1 NT <1.1 <1.12,2,4-Trimethylpentane NT NT NT NT NT NT NT NT NT <0.05 <1.1 <1.0 <1.1 NT <1.1<1.1Vinyl Chloride <0.51.1<0.51.2 2.9<0.52.1<0.5 <0.5 <0.5 <1.1 <1.0 <1.1 NT <1.1 <1.1m/p Xylene <0.5 <0.511 7.8 7.1 14 3.7 2.1<0.5 <0.5 <1.1 <1.0 <1.1 NT <1.1 <1.1o-Xylene <0.5 <0.51.6 1.3 1.4<0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <1.0 <1.1 NT <1.1 <1.1NR = Not RequiredNT = Not Tested* = Trace Concentration{1} Parameter also detected in one or more quality control blanks.123 of 146