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<br />-14- <br />TABLE 6. (pace 4) <br /> <br />September 16, 1982 <br />Chemical Parareter Justification <br />Lead (Pb) commonly exceeds drinking water, livestock, and <br />aquatic life water quality standards in the Yamoa <br />River (F1eZancon, 1980); increased concentration <br />reported in mine drainage in Cols trip, Montana <br />(Van Voast, et a1., Z977). <br />Manganese (Mn) increased concentration reported in mine spoils <br />water at the Edna Mine (Skogerbae, et a1., 19791; <br />concentrations may increase in waters near surface <br />mines in the western V.S. (Everett, 2979); effluent <br />limitations from Rule 4.05.2(7). <br />Mercury (Hg)' increased concentration reported in mine spoils <br />water at the Edna Mine (Skogerboe, et a1., 1979); <br />commonly exceeds water quality standards in the <br />Yampa River (Steele, et a1., 1978); may be a poZ- <br />Zutant associated with fly ash disposal in surface <br />mines in the western U.S,. (Everett, 1979). <br />Molybdenum (Mo) increased concentration reported in mine effluent <br />at the Empire Energy Mine (Empire Energy, 1981); <br />may be a pollutant associated with fly ash disposal <br />• at surface mines in the western U.S. (Everett, 1979); <br />change in Cu:MO ratio corzZd cause molybdenosis in <br />Livestock. <br />Selenium (Se) increased concentration reported in spoils water <br />at t'3e Edna Mine (Skogerboe, et al., 1979); may <br />be a pollutant associated with fly ash disposal <br />at surface mines in the western U.S. (Everett, 2979); <br />coal commonly has a higher than average selenium <br />concentration (NAS, 1976); t).e most highly <br />seleniferous sediments in the U.S. were deposited <br />during the Cretaceous Period (NAS, Z976), most coal- <br />bearing strata in Colorado were deposited during the <br />Cretaceous Period; selenium concentrations in coals <br />• and associated black shales are usually much higher <br />than average (Iatkin, 1973); at a pH of about 8 <br />(common in Colorado coal environments), selenite <br />may be oxidized to the soluble seIenate ion (Catkin, <br />1973); harmful to livestock if in excessive con- <br />centrations. <br />Zinc (Zn) increased concentration reported in spoils water <br />at the Edna Mine (Skoger9oe, et a1., 1979); concen- <br />trations may increase in waters near surface mines <br />in the western U.S. (Everett, 1979); may be a po1- <br />' Iutant associated with fly ash disposal at surface <br />mines in the western U.S. (Everett, 1979). <br />