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Since critical t = 0.854 (one - tailed, alpha = 0.2, 29 df) and t is greater than this critical value, a <br />hypothesis of no difference is rejected and reclamation success for Phase Ill background shrub density in <br />2011 is demonstrated. <br />Concentration Area Density <br />Use of a reverse -null t -test of the assertion that the 2011 BRB PSCM -1 concentration area woody plant <br />density exceeds 90% of the standard is as follows: <br />t <br />z — (0.9* technical, standard) <br />_ 2703.3 —1800 <br />t c — ( 2656.9\— 2,40 <br />0 <br />Since critical t = 0.849 (one - tailed, alpha = 0.2, 49 df) and t is greater than this critical value, a <br />hypothesis of no difference is rejected and reclamation success for Phase Ill shrub concentration area <br />density in 2011 is demonstrated. Also note that the shrub concentration area in which adequate density <br />has been demonstrated occupies over 22 percent of BRB PSCM -1, well exceeding the minimum <br />requirement of 5 percent. <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 PSCM- 1,Table H -5 shows that the most abundant single species (intermediate wheatgrass) was <br />52.0 % relative first -hit cover, below the 60% threshold of concern. <br />Hence Mandatory Test A is passed for 2011 data. <br />With regard to Alternative Test B, the Total Species Density test the following is calculated for 2011 BRB <br />PSCM -1 (Table H -6): <br />Mean Species density (Area- weighted) in the two reference areas = 38.05 species per 100 sq.m. <br />28 <br />