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Shrub Evaluation - Shrub density sampling will be conducted in the reclaimed area using <br />the belt transect method in accordance with Section 4.15.11(c)(i). Belt transects are 2 m x <br />50m in dimension and are randomly oriented from the sample point origin. <br />Sample adequacy (15 minimum samples) for the belt transect method will be evaluated <br />based on the following expression: <br />t 2 s 2 <br />n,,, _ d xy <br />Where: <br />n,,, = Minimum Sample Size <br />s =Sample variance (n-1 degrees of freedom) <br />d =Precision (0.10 for cover and production; 0.15 for woody plant density) <br />x = Sample arithmetic mean <br />t = The (a=.10) t-table value for a 1 tail t-test, n-1 degrees of freedom (infinite degrees of <br />freedom may be used if n>30) <br />n = Sample size <br />This hypothesis will be tested using methods set forth in Section 4.15.11(2). Hypothesis <br />testing may include the null or reverse null approach previously referenced or methods <br />described in 4.15.11(3) where large heterogeneity in shrub density causes large sample <br />sizes and sample variation. <br />It is proposed that the formal judgment of the stocking of woody plants within the <br />reclaimed area be 200 stems per acre in the background areas of reclamation and 2000 <br />stems per acre in the concentrated shrub establishment areas and based on the following <br />testable hypothesis: <br />The density of full shrubs and trees will equal or exceed 90 percent of a standard of 200 <br />stems per acre in background areas and 90 percent of 2000 stem per acre in concentration <br />areas. <br />Shrub concentration areas are depicted on Exhibit 13-13.3 in appendix 13-3. There is a <br />single shrub concentration area of approximately 6 acres within the southwestern corner of <br />the PR-2 reduced permit boundary. <br /> <br />PR-02 2.05.4-4 11/10