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Peabody Sage Creek Mine <br />SL -3 Phase III Bond Release Request <br />July 2014 <br />A reverse t -test asserting that the 2011 BRB PSCM -1 Phase III background woody plant density <br />is indistinguishable from 90% of the standard is as follows: <br />ae — (0.9 * technical standard) <br />t� _ <br />_ <br />732.5-180 <br />tc = 2.74 <br />1104,8 <br />( 30 <br />Since critical ttt = 0.854 (one - tailed, alpha = 0.2, 29 df and tc is greater than this critical value, <br />reclamation success for Phase III background shrub density in 2011 is demonstrated. <br />A reverse t -test asserting that the 2011 BRB PSCM -1 Phase III concentration area woody plant <br />density is indistinguishable from 90% of the standard is as follows: <br />tc _ — (0.9 * technical standard) <br />Un) <br />_ 2703.3 — 1800 <br />tc 2666.9 = 2AD <br />( 58 <br />Since critical tt = 0.849 (one - tailed, alpha = 0.2, 49 df and tc is greater than this critical value, <br />reclamation success for Phase III shrub concentration area density in 2011 is demonstrated. Also <br />note that the shrub concentration area in which adequate density has been demonstrated <br />occupies over 22 percent of BRB PSCM -1, well exceeding the minimum requirement of 5 <br />percent. <br />Species Diversity. PSCM bond release requirements for species diversity are judged using the <br />four tests presented below. Success is demonstrated by passing the first (A) and at least two of <br />the remaining three (B, C, and D). <br />Mandatory TestA): No Ovenvbelming Dominant <br />No single plant species may exceed 60% relative cover. <br />17 <br />