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litter cover Sn reclaimed areas generally runs 15 percent or greater (see 1987 through • <br />1990 Seneca II Mine Revegetation Monlto ring Reports). The cover standard detailed above <br />also solves the problem of a cover standard derived from only the herbaceous component of <br />a reference area heavily dominate~d by woody vegetation which Ss too low, or a standard <br />derived from the same reference area using herbaceous and woody vegetation cove[ comYlned, <br />which is unreasonably high. <br />The cover success standard for the concentrated shrub and tree establishment sites will be <br />based on the weighted mean herbaceous cover for the aspen, mountain brush, and sagebrush <br />types occurring in the Yoast Mine extended reference area. Herbaceous cover data will be <br />collected from the three designated reference area vegetation types and the mean cover <br />values for each type multiplied b}' that community's premi ne acreage. The products of each <br />will be added and then divided by [he premine acreage total for the three designated <br />reference area types. The resulting weighted herbaceous cover value will be compared to <br />the average vegetation cover determined from the concentrated shrub and tree establishment <br />sites. Cover Sn these sites shall be considered acceptable Sf it Ss not less than 90 <br />percent of [he standard with 90 percent statistical confidence. <br />• <br />The weighting formula to be used in determining the above cover success standard Ss: <br />r`REV 2 .90 (("a)(`AI + IMBa)(`MB) + (°°a)1`SB11 <br />r. <br />with 90 percent statistical confidence <br />where: `REV = Average vegetation cover for the concentrated establishment sites <br />being evaluated <br />"a = Aspen type acreage, premining surface area <br />MBa = Mixed brush type acreage, premining surface area <br />°sa = Sagebrush type acreage, premining surface area <br />`A = Average reference area herbaceous cover, aspen type <br />'MB = Average reference area herbaceous cover, mixed brush type <br />'SB = Average reference area herbaceous cover, sagebrush type <br />Ta = Total of relative type acreages, premining surface area <br />Revegetation success for cover Sn reclaimed portions of the mesic drainage type and the • <br />39a Revised 12/12/95 <br />