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SOIL BACKGROUND LEVELS FOR>10 FEET <br /> Analyte n Percentile m N Detection Median Method Number NLN,ber <br /> 50th 95th I 99th Detection Limit Boreholes AF Bases <br /> uminum 1953 7180 22200 33500 99% 11 827 10 <br /> Antimony 2901 ND 13 18.1 6% 6.6 1054 '0 <br /> Arsenic 2837 1.6 9.4 20 50% 0.6 1006 10 <br /> Barium 2452 63 340 583 99% 1 909 10 <br /> Beryllium 2815 0.3 1.14 10.3 48% 0.2 1013 9 <br /> Boron 169 45.1 157 201 94% 3 67 3 <br /> Cadmium 3058 NO 1.9 4.9 170% 0.5 1138 10 <br /> Chloride 173 151 569 6510 93% 0.2 85 2 <br /> Chromium 3364 8.4 50 90 90% 1 1189 10 <br /> Chromium-6 893 ND 1 4 8% 0.2 204 8 <br /> Cobalt 2247 5 25 38.7 85% 1.1 826 9 <br /> C per 3086 7.2 54.7 111 93"�, 2 1111 10 <br /> C anide 437 NO 0.651 1.1 2% 0.5 174 6 <br /> Fluoride 119 1.4 9.4 25 82% 0.5 47 1 <br /> Iron 2365 11700 40800 55100 99% 5 5 E93 11 <br /> Load 3464 2.6 11.7 28.6 59% 1.5 <br /> Magnesium 2198 3275 9910 13600 99% 20.6 846 10 <br /> Manganese 2320 198 934 1910 99% 1 878 10 <br /> Mercury 2401 ND 0.3 0.3 5% 0.1 826 to- <br /> Molybdenurn 2183 1.1 20 44 9% 2.2 816 10 <br /> Nickel 3035 5 41.3 68.5 62% 4 1122 10 <br /> Selenium 2656 NO 11 13 3% 0.6 964 10 <br /> Silver 3016 ND 2.5 5.7 8% 1 1117 10 <br /> Sodium 1 17201 2481 1500 3340 82°, 104 743 10 <br /> Thallium 2852 NO 26 178 9% 5 1042 10 <br /> Vanadium 2296 26.2 95 123 999: 1.1 868 10 <br /> Zinc 1 32091 28.71 100 189 981% 1 2 1 1176 10 <br /> Background Levels of Lead in Soil by Vertical Horizon <br /> 14n -, <br /> 120 <br /> 100 <br /> E 80 <br /> 0 <br /> 60 0-2.5 It <br /> u 0>-2.5,10 It <br /> c <br /> u O>-1011 <br /> 40 <br /> 20 <br /> 0 <br /> i <br /> Vertical Horizon <br />