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Section 81E.1'_7 (a) Continued. <br />• <br /> (<) A countable tree or shrub means a tree that can be used in calcu- <br /> lating the degree of stocking under the following criteria: <br />(i) the tree or shrub shall be in place at least 2 growing seasons, <br />(ii) the tree or shrub shall be alive and healthy, and <br />(iii) the tree cr shrub shall have at least one third of its length in <br />live crown. <br />(3) Rock areas, permanent road and surface water drainage ways on the <br />revegetated area shall not require stocking. <br />(b) The following are the minimum performance standards for areas where <br />commercial forest land is the appro•/ed postmining land use: <br />• (1) The area shall have a minimum stocking cf 450 trees or shrubs per <br />acre, <br />(2) A minimum o; 75 percent of countable trees or shrubs snail be <br />commercial trees species, <br />(3) The number of trees or shrubs and the ground cover shall be deter- <br />mined using procedures described in Section ^o1E.11E(b)(3)(iv) and <br />816.117(a) and the szm?ling method a??roved by the regulatory authorira; <br />when the stocking is equal to or greater than 450 trees or shrubs per <br />acre and there is acceptable groundcover, the 5 or 10 _; ear res_cnsi- <br />bility period reouired in Section 21E.116(b) shall begin; <br />(u) UDOn exo iration of <br />time of request for bon <br />ration sho;aing that the <br />cn the revegetated area <br />• (c)(=)• <br />the 5 or 10 year responsbiiity period and a~ the <br />3 release, each perr.:ittee shill provide documen- <br />stoc}:ing o' trees and shrubs and the groundccver <br />satisfy Sections 516.115(b)(3)(iv) zrd Sl"0.'_17 <br />816-163 <br />