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xlps =average reference azea all hit herbaceous covet-improved • pasture-subirrigated Ta =total of relative community types used in comparison, premise area Average vegetation cover will be used for reclaimed azeas because successional development will have established a predominantly herbaceous community even with shrubs present. The cover success standazd for all permanently reclaimed areas in the haul road corridor will be 35 percent. This value represents the weighted mean herbaceous vegetation cover for the sagebrush, western wheatgrass/alkali sagebrush, alkali sagebrush/greasewood, and alkali meadow types as derived from baseline data. The latter two types encompass only 3.2 and 1.4 acres, respectively. In addition, the alkali meadow type has been variously disturbed Neither type is extensive or unique enough to warrant a separate success standard. The weighted mean cover value was detemvned from cover data for the four types as determnied during 1992 supplemental baseline vegetation studies (see Appendix B to Attachment 10.1, Tab 10, Vegetation). Foz vegetative cover, the revegetated azea shall be considered acceptable if it is not less than 90 percent of the standazd (35) with 90 percent statistical confidence. • The value of 35 percent herbaceous vegetation cover is a reasonable value when combined with the anticipated litter values of 15 percent (see previous discussion) and the more retie site conditions along the cosidor. Also, the value of 35 percent herbaceous cover for the standard is nearly identical to the herbaceous cover for the upland improved pasture type sampled during the 1992 supplemental baseline studies. This premise type represents reseeded lands previously occupied by the sagebrush and western wheatgrass/ alkali sagebrush types prior to disturbance. The sagebrush and western wheatgrass/alkali sagebrush types represent the dominant native vegetation types along the corridor, which will be affected. Undisturbed areas of the above vegetation types may be used to verify the above cover standard; however, at this time it is uncleaz as to how much azea of these two types will remain undisturbed in the haul road corridor portion of the permit area. Conservation Reserve Program (CRP) lands were occupied by the sagebrush and western wheatgrass/alkali sagebmsh types prior to being cropped CRP lands will be seeded with the permanent mix used in the haul road corridor unless the landowner specifically requests the postmining land use be cropland In this case, cropland success standards will apply. As discussed in • Tab 4, baud Use and Tab 10, Vegetation, CRP lands aze former cropland areas seeded to a permanent vegetative cover for a period of ten years. At the end of the ten-yeaz period, these lands may be PR-02 37 Revised 01/06