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HISTORICAL SUMMARY OF ANALYTICAL RESULTS <br />UNSATURATED ZONE AIR <br />NORTH COUNTY SANITARY LANDFILL <br />SG-T <br />Sample Type: Air <br />Sampling 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 1/29/10 <br />Tetrahydrofuran NT NT NT NT NT NT NT NT <0.05 8.1 10 <5.4 10 28 <1.1 <br />Toluene 2.8 10 1.3 1.1 <0.5 <0.5 3.7 <0.5 6.3 6.0 76 240 110 410 6.4 <br />1,2,4-Trichlorobenzene 1.1 J <0.5 <0.5 <0.5 <1.0 <1.0 <1.0 <1.0 <1.0 <4.6 <8.1 <22 <5.7 <14 <4.4 <br />1,1,2-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 <1.1 <br />1,1,1-Trichloroethane 1.0 <0.5 <0.5 <0.5 34 97 9.5 <0.5 11 <1.1 5.7 <5.4 1.6 <3.4 <1.1 <br />Trichloroethene 1 J <1.0 <1.0 1.1 <1.0 6.6 <1.0 <1.0 14 5.9 34 67 40 110 11 <br />Trichlorofluoromethane (Freon 11)2.3 <0.5 <0.5 <0.5 476 1166 170 4 260 1.3 80 30 33 44 2 <br />1,3,5-Trimethylbenzene 1.4 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <2.0 <5.4 <1.4 4.8 1.1 <br />1,2,4-Trimethylbenzene 1.9 2.4 1.8 1.1 <0.5 <0.5 <0.5 <0.5 <0.5 <1.1 <2.0 <5.4 2.1 13 2 <br />2,2,4-Trimethylpentane NT NT NT NT NT NT NT NT 110 6.4 82 74 56 91 3.1 <br />Vinyl Chloride <0.5 <0.5 1.5 <0.5 <0.5 <0.5 39 3 94 1.5 120 120 190 260 5.2 <br />m/p Xylene 7.6 1.3 5.7 6 <0.5 <0.5 4.2 <0.5 9.1 3.6 60 140 70 290 14 <br />o-Xylene 3.8 <0.5 1.3 1.1 <0.5 <0.5 <0.5 <0.5 2.9 <1.1 3.5 10 6.5 34 4.6 <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 />38 of 48