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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 Mine are an order of magnitude below <br /> excessive levels (Tables 6-6 and 6-7; Figures 6-3 and 6-6) . No <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 Mine due to the extremely remote chances of any <br /> potential arsenic toxicity. <br /> Boron. Elevated boron levels are frequently found in arid soils were <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 Mine Areas 2 and 3. <br /> Copper. Naturally occurring excesses of extractable copper have not <br /> been reported in the soil literature (Munshower, 1983) . Mean 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 />