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Section 816.117(a) Continued. <br />• <br />(1) Root crown or root sprouts over 1 foot in height shall count as one <br />toward meeting the stocking requirements. Where multiple stems occur <br />only the tallest stem will be counted. <br />(2) 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 or 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 />• <br />(b) The following are the minimum performance standards for areas where <br />commercial forest land is the approved poatmining land use: <br />(1) The area shall have a minimum stocking of 450 trees or shrubs per <br />acre, <br />(2) A minimum of 75 percent of countable trees or shrubs shall be <br />commercial trees species, <br />(3) The number of trees or shrubs and the groundcover shall be deter- <br />mined using procedures described in Section 816.116 (b)(3)(iv) and <br />816.117 (a) and the sampling method approved by the regulatory authori- <br />ty; when the stocking is equal to or greater than 450 trees or shrubs <br />per acre and there is acceptable groundcover, the 5 or 10 year responsi- <br />bility period required in Section 816.116 (b) shall begin; <br />81b-163 <br />