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• analyses were performed on the overburden and interburden material <br />sampled from Kline Areas Z and 3. <br />Cadmium. Plant toxicities due to elevated levels of cadmium under <br />natural conditions or in reclamation are unlikely (Barth et al., 1981 <br />and P•lunshower, 1983). Overburden and interburden cadmium concentrations <br />at Nucla .Mine for Phase I samples were generally below the detection <br />level and v,~ere also two orders of magnitude below the excessive level of <br />5 ppm (Tables 6-6 and 6-7). No additional cadmium analyses are <br />justifiable at Nucla Kline. <br />Iron. Documented cases of iron toxicity are rare and appear to be <br />limited to flooded soils (Barth et al., 1981). Iron deficiencies are of <br />more concern in some reclamation situations where soils are alkaline. <br />Extremely high levels of iron often are not toxic but cause imbalances <br />or interfere with the uptake of other essential nutrients. <br />Mean overburden and interburden iron concentrations at Nucla tdine for <br />Phase I samples generally ranged between 200 to 300 ppm (Tables 6-6 and <br />6-7). These levels are not toxic and should not cause nutrient <br />imbalances if the regraded spoil is covered with adequate amounts of <br />topsoil (personnel communication with Rick Barth, i4arch 14, 1986). Iron <br />analyses were highly recommended for site 873E during Peabody's April <br />10, 1986 meeting with Ch1LRD. Consequently, iron analyses were completed <br />on all samples collected from site 873E. <br />Selenium. The concentration of water soluble selenium in soil commonly <br />averages from 0.05 to 0.1 ppm. Literature indicates that once the level <br />of water soluble selenium in soil exceeds 2 ppm, vegetation is likely to <br />accwnulate sufficien[ selenium to poison livestock (Barth et al., 1981). <br />Selenium levels in Phase I overburden and interburden samples at Nucla <br />Mine were always less than 0.1 ppm, mare than 10 times less than being <br />excessive (Tables 6-6 and 6-7). No additional selenium analyses are <br />warranted at Nucla Mine. <br />Nitrate - Nitrite - Ammonium. Nitrate and ammonium analyses are <br />generally determined on overburden and interburden material which will <br />serve as a growth or aquifer medium. <br />6-36 Revised 3/6/87 <br />