100 Areas CERCLA ecological investigations

Abstract

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Hanford Site National Environmental Policy Act (NEPA) characterization. Revision 7

“…The 100 Area operable units are characterized by a narrow band of riparian vegetation along the shoreline of the Columbia River, with much of the area shoreward consisting of old agricultural fields, dominated by cheatgrass and tumble mustard. Scattered big sagebrush and gray rabbitbrush also occur throughout the 100 Areas (Landeen et al 1993). Waste management areas, reactors, and crib sites are generally vegetated by noxious or invasive species including Russian thistle, tumble mustard, and cheatgrass.…”

“…Waste management areas, reactors, and crib sites are generally vegetated by noxious or invasive species including Russian thistle, tumble mustard, and cheatgrass. Russian thistle and gray rabbitbrush that occur in these areas are deep rooted and have the potential to uptake radionuclides and other contaminants, functioning as a pathway to other parts of the ecosystem (Landeen et al 1993). Federal and state threatened or endangered species that have been reported for the 100 Area operable units include Columbia yellowcress, southern mugwort, false pimpernel, shining flatsedge, gray cryptantha, and possibly dense sedge (Landeen et al 1993).…”

“…For a description of relative concentration, see Landeen et al (1993). Vegetation surveys were conducted at the 300-FF-5 Operable Unit during 1992.…”

“…Insects, reptiles, amphibians, birds, and mammals that occur in the 100,200, and 300 Area operable units, in general, are typical of species that occur 4.71 across the Site. During 1991 to 1993, surveys for birds, mammals, insects, and vegetation were conducted at several of the 100 and 300 Area operable units (Brandt et al 1993;Landeen et al 1993). Landeen et al (1993) conducted surveys at the 100 Area operable units between 1991 and 1992.…”

“…During 1991 to 1993, surveys for birds, mammals, insects, and vegetation were conducted at several of the 100 and 300 Area operable units (Brandt et al 1993;Landeen et al 1993). Landeen et al (1993) conducted surveys at the 100 Area operable units between 1991 and 1992. One hundred seven bird species were recorded during the 199 1/1992 surveys.…”