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A. = Aspen type percentage of the premining surface to be affected by mining <br />MB = Mountain Brush type percentage of the premining surface to be affected by <br />mining <br />SMB = Steep mountain brush type percentage of the premining surface to be <br />affected by mining <br />SB = Sagebrush /Snowberry type percentage of the premining surface to be <br />affected by mining <br />X = Average reference area all hit total herbaceous cover - Aspen type <br />xMB = Average reference area all bit total herbaceous cover - Mountain Brush type <br />x SMB = Average reference area all hit total herbaceous cover - Steep Mountain Brush <br />type <br />x = Average reference area all hit total herbaceous cover - Sagebrush /Snowberry <br />type <br />Revegetation success for cover in reclaimed portions of the mesic drainage type and the area <br />previously occupied by the improved pasture - subirrigated type will be evaluated by comparing their <br />weighted mean herbaceous cover to the total vegetation cover of the reclaimed mesic drainage type. <br />The area previously occupied by the improved pasture subirrigated type will be reclaimed to a mesic <br />drainage type. The cover comparison value for the mesic drainage and improved pasture - subirrigated <br />types will be determined from undisturbed areas of the two types within the permit area. This value <br />will be a weighted mean of the herbaceous cover for the two undisturbed vegetation types. The <br />weighted mean calculation procedure is as described above in the cover standard for reclaimed <br />uplands. The average vegetation cover in the reclaimed mesic drainage areas will be considered <br />acceptable if it is not less than 90 percent of the cover standard with 90 percent statistical confidence. <br />The weighting formula to be used for the mesic drainage cover evaluation is: <br />xrev> .90 (Dvm)(xMD) + ( IPSa (x►PS)) <br />with 90 percent statistical confidence, where: <br />x rev = average vegetation cover, reclaimed area <br />MD = mesic drainage type percentage of the premining surface to be affected by mining <br />IPS = improved pasture - subirrigated premine type percentage affected by mining <br />x — average reference area all hit herbaceous cover -mesic drainage <br />RN -03 36 Revised 10/10 <br />