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tc _ <br />— (0.9 * technical standard) <br />�T) <br />t _ 554.4-90 = 2.95 <br />853.9' <br />36 <br />Since critical t = 0.854 (one - tailed, alpha = 0.2, 29 df) and tc is greater than this critical value, the <br />hypothesis of no difference is rejected and reclamation success for BRB -5 background woody plant <br />density under Phase III is demonstrated. <br />A reverse t -test of the assertion that the 2011 BRB -5 Concentration Area woody plant density is <br />indistinguishable from 90% of the standard is as follows: <br />tc _ <br />Y — (0.9 *technical standard) <br />r� <br />_ 2035.6-900 _ <br />t` 1303.E — 5.�2 <br />5o <br />Since critical t = 0.854 (one - tailed, alpha = 0.2, 29 df) and t, is greater than this critical value, the <br />hypothesis of no difference is rejected and reclamation success for BRB -5 woody plant concentrations <br />areas under Phase III is demonstrated. <br />SPECIES DIVERSITY AND COMPOSITION <br />With regard to Mandatory Test A, that no single species comprise greater than 60% relative cover in 2011 <br />BRB -5 (Table H -1), Table 1 shows that the most abundant single species (intermediate wheatgrass) was <br />25.88 % relative first -hit cover, below the 60% threshold of concern. <br />Hence Mandatory Test A is passed. <br />With regard to Alternative Test B, the Total Species Density test the following is calculated for 2011 BRB - <br />5 (Table H -2): <br />Mean Species density (Area- weighted) in the two reference areas = 38.05 species per 100 sq.m. <br />21 <br />