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• grams, galleta, bottlebrush squirreltail, snakeweed, four-wing saltbrush, cheatgrass, and <br />rubber rabbit brush. This area will incur no disturbance. <br />Flood Plain. The bottom of Tuttle draw has a flood plain that varies in width from 20 meters to <br />100 meters. The flood plain is comprised of two parts, the channel bank which is 1 to 3 meters <br />in width and the alluvial terrace which is 20 to 100 meters wide. Soil map unit 98A is <br />representative of the alluvial terrace soil. The flood plain type resides wholly outside the area of <br />disturbance. <br />Channel bank. The channel bank is directly adjacent to the Tuttle Draw water surface. It is <br />continually saturated with water and supports a variety of native and introduced hydrophytic <br />graminoids and fortis. Closest to the stream, the bank is lined with scirpus (Scirpus <br />americans). Intermingled and moving away from the bank, are rushes and sedges (typically <br />Carex nebrascensis and Carex occidentalis) along with horsetail (Equisetum kansanum), salt <br />grass (Disticlis stricta) and alkali sacatone (Muhlenbergia aspertolia). In some areas coyote <br />willow (Salix exigua) and saltcedar (Tamarisk sp.) predominate. The channel also has a few <br />cottonwoods (Populus fremontii and Populus longifolia) and Russian olive. Intoduced species <br />• have also invaded the channel bank. The species include alfalfa, Russian knapweed, <br />milkweed. Plantain (Plantago lanceolata), Yellow and white honeyclover <br />Alluvial terrace. The alluvial terrace is comprised of sands, loamy sands and sandy loam <br />deposited by major flood events. The terrace is 1 to 5 meters above the stream channel and is <br />dry at the surface but receives subsurface moist from the stream. The alluvial terrace has had <br />varying degrees of human activity. The most intensively managed parts of the alluvial terrace <br />are an irrigated hayland pasture owned by Johnson and irrigated pastures owned by Martin <br />and Lloyd. The majority of the alluvial terrace have had disturbances with the removal of <br />native sagebrush, rubber rabbitbrush, four-wing saltbrush and greasewood. Abandoned areas <br />have been reinvaded with these species along with Russian knapweed, Lappula, burdock, <br />cheatgrass and pricly pear cactus. The remaining native trees are Fremonts cottonwood and <br />longleaf cottonwood. Russian olive has invade along with saltcedar in a few areas. <br />Sagebrush Reference Area. This reference area was established in the initial permitting of <br />the mine and is to be replaced by the new dryland pasture reference area. In agreement with <br />• (REVISED 9/99) 2.04.10 - 80 <br />