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• vegetation is practicable for the postmining land uses and desirable for erosion control as <br />successional patterns establish in the reclaimed communities. Redente and others (1984) in a study <br />of succession on disturbed sites in northwest Colorado, found that seeded azeas were dominated by <br />grasses five yeazs later, no matter what the composition of the original mix was. <br />Cover data will be collected from the reclaimed bond release area and the sagebrush and mountain <br />brush reference areas during the same period. The herbaceous cover component determined from <br />sampling in the reclaimed and reference azeas will be used for the comparison. The herbaceous <br />cover value from the mountain brush reference azea will be multiplied by .83 while the herbaceous <br />cover value from the sagebrush reference azea will be multiplied by .17. The two products will be <br />added to determine the weighted covet value. The resulting weighted value will be multiplied by a <br />factor of two in order to determine the actual value to be used in the success comparison. As <br />discussed in the revegetation success section of Seneca II-W Pemut C-82-057 (Tab 22), this is a <br />practical approach for development of a cover standard. It solves the problem of a cover standard <br />derived from only the herbaceous component of a woody dominated reference area which is too low, <br />• or a cover standard derived from combined herbaceous and woody vegetation from the same <br />reference azea which is unreasonably high. <br />The calculated cover standard will be compared to the mean herbaceous covet value for the <br />revegetated azeas. For vegetative cover, the revegetated azea shall be considered acceptable if it is not <br />less than 90 percent of the cover standazd with 90 percent statistical confidence. The general <br />equation to be used in comparing successful tevegetation for cover is as Follows: <br />xrevc _ .90 (2 (.83xb~ + 2 (.17as~) with 90% statistical confidence <br />where: xr~,c =mean herbaceous coves - revegetated azea <br />xbc =mean herbaceous covet -mountain brush reference azea <br />xsc =mean herbaceous covet -sagebrush reference azea <br />Cover data will be collected using the point-intercept method. Sample adequacy will be met for both <br />reclaimed and reference areas. All sample sites will be randomly located. <br />• Production. Successful revegetation for production in -all reclaimed azeas will be based on <br />herbaceous production (4.15.8(4)). The mean herbaceous production in the revegetated areas will be <br />TRIO 13-15-2 <br />