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concentrations of other metallic nutrients (Cu, Fe, and Mn). Zinc toxicity is more of a concern on <br />acid soils because of the higher solubility of zinc on acid soils. The antidote for zinc toxicity is the <br />• <br />application of lime (Traynor, 1980). <br />Cadmium. Cadmium is anon-essential metallic element that is used in industry. Plant toxicities <br />due to elevated levels of cadmium under natural conditions or in reclamation are unlikely (Barth et <br />al., 1981 and Munshower, 1983). <br />Mercury. Mercury predominantly exists in an inorganic form which is not absorbed readily by <br />plants. There have been no documented cases of mercury toxicity to plants or to animals under <br />normal conditions. Mercury toxicity is limited to industrial or agricultural situations where mercuric <br />fungicides or other contaminants are used. <br />Lead. This is anon-essential (to plant and animal life) heavy metal that could induce plant toxicity <br />symptoms if present in excess quantities. As the pH decreases, the solubility and the potential for <br />lead toxicity increases. Inmost soils of the Great Plains, lead is complexed and not readily leached <br />to ground water nor available for plant uptake (Barth et al., 1981 and Munshower, 1983) <br />Arsenic. Munshower (1983) states that toxic concentrations of arsenic in natural soils and <br />overburden have never been reported. Barrett and others (1980) stipulate that toxicity is confined <br />to soils which have accumulated arsenic through foliar spray compounds. The arsenates are fixed <br />by soils in a relatively insoluble state and are not lost by leaching. The critical water-soluble arsenic <br />concentration in soils is 2 ppm (USDA, 1957). <br />Parameter Selection -Phase II <br />Overburden parameters for the second phase sampling were selected after reviewing the Phase <br />I data. Constituents which approached or exceeded marginally suitable to unsuitable guideline <br />levels during Phase I sampling were included on the Phase II analyses list, Those constituents <br />which were below detection limits were naturally omitted from the Phase II analyses list. <br />Phase I overburden sampling and analyses results for the New Horizon 2 study area were <br />presented to the Division on June 22, 1987 (meeting, G. Wendt and S. Renner). A letter of <br />• Revised 27 Aug 2002 19 <br />