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t� = (37.5 — 36.2) /(14.2 /sqrt 30) = .501 <br />Since critical t = 0.854 (one - tailed, alpha = 0.2, 29 df) and t, is less than this critical value, the <br />hypothesis that the mean is indistinguishable from the standard is accepted, and reclamation <br />success for Phase II BRB PSCM -2 is demonstrated. <br />Phase 11 BRB PSCM -2 Species Composition Comments <br />Total observed species density averaged 25 (native and non - native) species per 100 sq.m. in the <br />Phase II BRB PSCM -2 tested in 2010 at the Peabody Sage Creek Mine. This is less than the <br />averages (from 28 to 33 species per 100 sq.m.) for the reference areas (see Figure 2). However, <br />within the 30 random samples taken (comprising together slightly under 3/4 acre) there exist 53 <br />native species. Hence the potential for native species to fill in to species density levels equaling <br />the references area levels is clearly present. Figure 2 also indicates that in terms of life forms, <br />there are species from the same spectrum and in similar proportion to what exists in the <br />reference areas. The greatest contribution to vegetation cover by an individual species is 31% <br />relative cover (by intermediate wheatgrass). <br />16 <br />