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HISTORICAL SUMMARY OF ANALYTICAL RESULTSUNSATURATED ZONE AIRNORTH COUNTY SANITARY LANDFILLSG-TSample Type: AirSampling Date 2/19/04 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 7/29/08 1/30/09 7/14/09 1/29/10Tetrahydrofuran NT NT NT NT NT NT NT NT <0.058.1 10<5.410 28<1.1Toluene2.8 10 1.3 1.1<0.5 <0.53.7<0.56.3 6.0 76 240 110 410 6.41,2,4-Trichlorobenzene1.1*<0.5 <0.5 <0.5 <1.0 <1.0 <1.0 <1.0 <1.0 <4.6 <8.1 <22 <5.7 <14 <4.41,1,2-Trichloroethane <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <2.0 <5.4 <1.4 <3.4 <1.11,1,1-Trichloroethane1.0<0.5 <0.5 <0.534 97 9.5<0.511<1.15.7<5.41.6<3.4 <1.1Trichloroethene1*<1.0 <1.01.1<1.06.6<1.0 <1.014 5.9 34 67 40 110 11Trichlorofluoromethane (Freon 11)2.3<0.5 <0.5 <0.5476 1166 170 4 260 1.3 80 30 33 44 21,3,5-Trimethylbenzene1.4<0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <2.0 <5.4 <1.44.8 1.11,2,4-Trimethylbenzene1.9 2.4 1.8 1.1<0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <2.0 <5.42.1 13 22,2,4-Trimethylpentane NT NT NT NT NT NT NT NT110 6.4 82 74 56 91 3.1Vinyl Chloride <0.5 <0.51.5<0.5 <0.5 <0.539 3 94 1.5 120 120 190 260 5.2m/p Xylene7.6 1.3 5.7 6<0.5 <0.54.2<0.59.1 3.6 60 140 70 290 14o-Xylene3.8<0.51.3 1.1<0.5 <0.5 <0.5 <0.52.9<1.13.5 10 6.5 34 4.6NR = Not RequiredNT = Not Tested* = Trace Concentration{1} Parameter also detected in one or more quality control blanks.131 of 146