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• invaded the channel bank. The species include alfalfa, Russian knapweed, milkweed. Plantain <br />(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 dry <br />at the surface but receives subsurface moist from the stream. The alluvial terrace has had varying <br />degrees of human activity. The most intensively managed parts of the alluvial terrace are an <br />irrigated hayland pasture owned by Johnson and irrigated pastures owned by Martin and Lloyd. <br />The majority of the alluvial terrace have had disturbances with the removal of native sagebrush, <br />rubber rabbitbrush, four-wing saltbrush and greasewood. Abandoned areas have been reinvaded <br />with these species along with Russian knapweed, Lappula, burdock, cheatgrass and pricly pear <br />cactus. The remaining native trees are Fremonts cottonwood and longleaf cottonwood. Russian <br />olive has invade along with saltcedar in a few areas. <br />Sac ebrush Reference Area. This reference area was established in the initial permitting of the <br />mine and is to be replaced by the new dryland pasture reference area. In agreement with the <br />CDMG, it was tested in the1999 sampling program. The sagebrush reference area represents <br />• remnants of native rangeland that has not been converted to the more characteristic intensive <br />agricultural land uses in the area. The sagebrush reference area is located at SW114, NE114, <br />Sec. 36, T.47N., R.16W. Between the old Peabody Site to the north and New Horizon Mine II <br />study area to the south. Soil is similar to study area soil map unit 98C and the vegetation is similar <br />to the sagebrush-1 (SG-1) in the study area. <br />Total vegetation cover (first hit) for the type averaged 36.0 percent, with bare ground at 32.5 <br />percent, litter at 19.9 percent, and rock outcrop and rock fragments at 11.6 percent (Table <br />2.04.10-27). Lichen and moss accounted for 4.6 percent of the mean cover. The shrub <br />component dominated with 14.4 percent cover followed by the perennial grass component at 11.9 <br />percent cover. Annual grasses account for 4.1 and 2.6 percent cover. Succulents had 0.1 <br />percent cover and trees had 0.9 percent cover. Consistent with the type designation, sagebrush <br />(Artemisia tridentata) had the highest perennial shrub species cover at 12.2 percent (68 percent <br />frequency), followed by broom snakeweed with cover at 1.9 percent (8 percent frequency). The <br />perennial grass blue grams had 7.4 percent cover (33 percent frequency) and needlegrass with <br />(REVISED 8/15/00) 2.04.10 - 72 <br />