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2.4 Vegetation <br />The baseline vegetation survey for the study area is presented in Tab 10 of this PAP. Eleven <br />dominant vegetation types including aspen, mountain brush, sagebrush, western <br />wheatgrass/alkali sagebrush, mesic drainage, improved pasture-subirrigated, steep mountain <br />brush, improved pasture-upland, alkali meadow, alkali sagebrush/greasewood, and conservation <br />reserve program land occur within the study area. Four miscellaneous land types including rock <br />outcrop, disturbed land, water, and existing roads are also present. <br />Sagebrush and steep mountain brush comprise most of the south and southwest facing <br />sandstone slopes, including many of the very steep nearly barren ridges and cliffs. Sagebrush <br />or western wheatgrass-alkali sagebrush comprise most of the gently rounded soft shale knobs <br />and ridges. The mountain brush type occurs dominantly on the steeply sloping sandstone <br />bedrock controlled sideslopes. Aspen communities occur on the northem aspect of deeply <br />incised steeply sloping ephemeral drainages, very steep sideslopes with northem and <br />northeastern aspects, and in drainage bottoms. Mesic drainage communities are present on the <br />dominant ephemeral drainages which have moderately deep to deep groundwater levels. The <br />alkali meadow and alkali sagebrush/greasewood types occur on alluvial and colluvial fans and <br />benches below shale ridges and knobs. The improved pasture-subirrigated type occurs on a <br />broad, gently sloping drainage (Annand Draw) at the transition between the Williams Fork and <br />Lewis shale formations. The improved pasture-upland and conservation reserve program land <br />occurs on the gently sloping Lewis shale derived soils along the proposed northem haul road <br />corridor. <br /> <br />5 <br />