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A M M M. M MMIMIMMIMI Mon M I MI <br /> HISTORICAL SUMMARY OF ANALYTICAL RESULT; <br /> UNSATURATED ZONE AIR <br /> NORTH COUNTY SANITARY LANDFILL <br /> SG-6 <br /> Sample Type:Air <br /> Sampling 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 <br /> Monitoring and Field Parameters <br /> Methane Concentration(percent) 38.4 59.7 44.2 54.8 45.9 55.4 50.3 57. <br /> Volatile Organic Compounds PPB(v/v) <br /> Benzene 5.8 264 107 357 107 354 358 150 <br /> Benzyl Chloride <1.0 <1.0 <1.0 <1.0 <1.0 <1. <1.0 ND <br /> Bromomethane <0.5 <0.5 < < <0.5 <0.5 <0.5 NO <br /> Carbon Tetrachloride <0.5 <0.5 < <0.5 <0.5 <0.5 <0.5 NO <br /> hlorobenzene <0.5 <0.5 <0.5 <0.5 175 213 136 NO <br /> Chloroethane 17 239 286 1 5 <0.5 771 685 NO <br /> Chloroform <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NO <br /> Chloromethane <0.5 <0.5 <0.5 3.3 <0.5 <0.5 <0.5 190 <br /> ibromoet ane <0.5 <0.5 <0.5 < < < <0.5 NO <br /> 1,2-Dichlorobenzene <0.5 <0.5 <0.5 31 7.0 24 <0.5 34 <br /> 1,3-Dichlorobenzene <0.5 <0.5 <0.5 380 <0.5 <0.5 <0.5 N <br /> 1,4-Dichlorobenzene 5.7 109 160 358 79 163 180 170 <br /> Dichlorodifluoromethane 30.0 3116 1765 119 <0.5 932 1126 570 <br /> 1,1- i oroethane 11 85 100 129 90 126 150 30 <br /> 1, - i oroethane <0.5 <0.5 <0.5 10 <1.0 19 <1.0 NO <br /> 1,2-Dichloro-1,1, ,2- etrafluoroethane 6.1 213 47 <0.5 <0.5 132 205 NO <br /> 1,1-Dick oroethylene 1.0 <0.5 <0.5 11.0 15 23 <0.5 6.9 <br /> cis-1,2-Dichloroethene 33 896 414 903 423 1374 1345 590 <br /> 1,2- a loropropane <0.5 <0.5 <0.5 6.3 3.8 <0.5 <0.5 ND <br /> cis-1.3-Di loropropene <0.5 <0.5 <0.5 1.2 < .5 <0.5 <0.5 NO <br /> trans-1, ichloropropene <0.5 <0.5 <0.5 .1 <0.5 <0.5 <0.5 NO <br /> Ethylbenzene 2.4 162.3 < .5 134 <0.5 <0.5 <0.5 11 <br /> Hexa orobutadiene <1. <1.0 <1. <1.0 <1.0 <1.0 <1.0 NO <br /> Methylene Chloride 3.0 59 41 67 27 86 141 3 <br /> Styrene <0.5 <0.5 <0.5 2.2 <0.5 12 <0.5 NO <br /> 1,1,2-Tric to 2, -Trifluoroethane <0.5 <0.5 <0.5 0.9 2.3 <0.5 <0.5 NO <br /> 1,1,2,2-Tetrachloroethane <0.5 <0.5 <0.5 <0.5 77 68 <0.5 NO <br /> Tetrachloroethene PC 25 492 <0.5 663 260 228 209 110 <br /> Toluene 1.5 136 31.0 70.0 64 27 <0.5 20 <br /> 1,2,4- richlorobenzene <1.0 <1.0 <1. <1.0 <1.0 <1.0 NO <br /> 1,1,2-Trichloroethane <0.5 <0.5 <0.5 61 37 20 <0.5 N <br /> 1,1,1-Trichloroethane <0.5 < <0.5 3.8 1.5 <0.5 <0.5 NO <br /> Trichloroethene 16 271 170 348 176 176 236 94 <br /> Trichlorofluoromethane 2.8 84 49 7.7 2.7 10 <0.5 18 <br /> 1,3,5-Trimet y enzene 1.1 110 <0.5 102-- 2 8 45 76 <br /> 1,2,4-1 rimet yl enzene 1.2 129 <0.5 143 16 200 97 170 <br /> Vinyl Chloride 6.3 158 206 155 <0.5 890 1216 55 <br /> m/p Xylene 26 977 294 830 296 590 406 250 <br /> o-Xylene 2.9 135 33 196 49 58 63 33 <br /> Not Ftequired <br /> NT=Not Tested <br /> =Trace Concentration <br /> {1} Parameter also detected in one or more quality control blanks. <br /> SG-6;Printed:7/31/2006 1 of 1 <br />