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• Therefore, molybdenum analyses were conducted on Phase II samples <br />collected from Hole 873E in Mine Areas 2 and 3. <br />Mercury. Mercury predominantly exists in an inorganic form which is not <br />absorbed readily by plants. There have been no documented cases of <br />mercury toxicity to plants or to animals under normal conditions. <br />Mercury toxicity is limited to industrial or agricultural situations <br />where mercuric fungicides or other contaminants are used. Mercury <br />levels in Phase I samples at Nucla ~4ine are an order of magnitude below <br />excessive levels (Tables 6-G and o'-7; Figures 6-3 and 5-6). `lo <br />additional mercury analyses are warranted at Nucla Mine. <br />Arsenic. No arsenic analyses have ever been completed on soil, spoil, <br />overburden or interburden material at Nucla Mine. Munshower {1983) <br />states that toxic concentrations of arsenic in natural soils and <br />overburden have never been reported. Barrett and others (1980) <br />stipulate that toxicity is confined to soils which have accumulated <br />• arsenic through foliar spray compounds. No arsenic analyses are <br />warranted at Nucla 14ine due to the extremely remote chances of any <br />potential arsenic toxicity. <br />IJ~ <br />Boron. elevated boron levels are frequently found in grid sails ~J2re <br />salts have accumulated near the surface. No toxic levels of boron have <br />been identified at Nucla Mine. Based upon Phase I analyses, mean <br />overburden and interburden boron levels are more likely to be deficient <br />than excessive (Tables 6-6 and 6-7; Figures 6-3 and 6-7). No additional <br />boron analyses were justified for idine Areas 2 and 3. <br />Copper. Naturally occurring excesses of extractable copper have nut <br />been reported in the soil literature (Munshower, 1983). dean overburden <br />and interburden copper concentrations from Phase I analyses fall in the <br />normal range (0.4 to 3.0 ppm) for agricultural soils (Tables 6-6 and <br />6-7, Figures 6-3 and 6-7). No additional copper analyses will be <br />performed at Nucla Mine. <br />• Lead. In most soils of the Great Plains, lead is complexed and not <br />readily leached to ground water nor available for plant uptake (Barth et <br />6-32 Revised 3/6/87 <br />