2013-04-15_PERMIT FILE - C1994082 (6)

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percent of the herbaceous production standard with 90 percent statistical confidence. The following weighted formula will be used to evaluate revegetation success for herbaceous production: xrev> .90 (SBJ (xsB) + (SIVIB) (xSMB) + \M J (xMB)+ (Aa) (x o with 90 percent statistical confidence, where: x rev = Average herbaceous production for revegetated area SBa = Sagebrush /Snowberry type percentage of the premine surface affected by mining MBa = Mountain brush type percentage of the premine surface affected by mining Aa = Aspen type acreage percentage of the premine surface affected by mining SMBa = Steep Mountain Brush premine type percentage affected by mining xSB = Average reference area herbaceous production - sagebrush type xNIB = Average reference area herbaceous production - mountain brush type x SMB = Average reference area herbaceous production — steep mountain brush type x A = Average reference area herbaceous production - aspen type Revegetation success for production, in the reclaimed mesic drainage type, will be evaluated by comparing a weighted mean herbaceous production value determined from undisturbed portions of the mesic drainage and improved pasture- subirrigated premine types. The areas previously occupied by this latter type will be reclaimed to a mesic drainage type. The method of weighting and comparison is similar to that described under cover for the mesic drainage type. Herbaceous production from the mesic drainage reclaimed areas will be compared to the weighted mean value. Reclamation success for herbaceous production shall be met when the value of the reclaimed area is at least 90 percent of the comparison standard with 90 percent statistical confidence. The following weighting formula will be used: xrev > .90 ((MD)(xMD) + (IPS)(xIPS) . with 90 percent statistical confidence, where: RN -03 39 W Revised 10/10