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• x~V =Average herbaceous production, reclaimed area <br />MDa = Mesic drainage acreage, premine area <br />IPSa =Improved pasture-subirrigated, premine area <br />x~ =Average reference area all hit herbaceous production, mesic drainage <br />x1PS =Average reference area all hit herbaceous production, improved pasture <br />-subitrigated <br />Ta =Total of relative community types used in comparison, premate azea <br />The production success standard for the reclaimed areas of the haul road corridor will be <br />based on the herbaceous production of the haul road corridor reference area. The vegetation <br />production in the reclaimed haul road corridor will be considered successful if it is not less <br />than 90 percent of the production standard with 90 percent confidence. The formula <br />describing this is: <br />xREVp > .90 (xHRCp) <br />where: <br />x12EVp =average herbaceous production for revegetared areas <br />• xHRCp =average herbaceous production for the haul road <br />corridor reference area <br />~ecies Diversity <br />Since the time that the diversity standazds for the original Yoast Mine permit were proposed, a more <br />comprehensive consideration of the nature of plant diversity on reclaimed azeas as compazed to un- <br />mined areas (reference areas) has been completed. The result is the set of proposed standazds below: <br />Background. The bulk of reclamation sites have used a seeding strategy that emphasized grasses to <br />assure adequate erosion control, and even when those grasses aze native species, the competitive <br />advantage of this lifeform over fortis and woody plants is evident at many mine locations. In the short <br />and medium term, it seems unavoidable that speces diversity will be less than that of most un-mined <br />comparison sites (ox baseline conditions). <br />This is not because of faulty seed mixes, or poor seeding technique, or any particular short-coming of <br />planting aregraded/topsoiled site. One of the lessons of the ]azge-scale experiment represented by <br />mine revegetation since the late 1970's is that given decent topsoil and reasonably favorable moisture <br />• conditions, the presence of species other than grasses is not subject to a "plant them and they will <br />come" direct approach. Rather, the circumstances that lead (or have lead in the pre-existing <br />TR-39 40 Revised 04/07 <br />