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n = Sample size <br />t, = Calculated t value <br />tt = Table It value (alpha = 0.1) <br />A one-sided (table) t value (t t) for n-1 = 14 degrees of freedom with alpha = 0.10 is 1.345. <br />Since t c is less than table t (t t), the null hypothesis is accepted, meaning that the mean allowable <br />herbaceous cover from the BRB is indistinguishable from 90% of the standard, and revegetation <br />success for this parameter is indicated. <br />SPECIES DIVERSITY AND COMPOSITION <br />With regard to Mandatory Test A, that no single species comprise greater than 60% relative <br />cover in the 2014 BRB PSCM-3. Table 6-1 shows that the most abundant single species sheep <br />fescue (Festuca ovina) was 36.9% relative all -hit cover, well below the 60% threshold of concern. <br />Hence Mandatory Test A is PASSED for 2014 data. <br />With regard to Alternative Test B, the Total Species Density test the following is calculated for <br />the 2014 BRB PSCM -3 (Table 6-2): <br />Mean Species density in the reference area = 25.40 species per 100 sq.m. <br />Probability -adjusted density standard. <br />Mean Reference Area Species Density — 1.15s = 25.40 — (1.15* 3.6) =21.21 <br />Mean total species density in the 2014 Landfill BRB = 21.53 <br />Since the reclaimed area value exceeds the standard, Alternative Test B is PASSED for 2014 <br />data. <br />Regarding Alternative Test C, the similarity index between the lifeform species density values for <br />the prescribed lifeforms for the 2014 BRB PSCM-3 and the Mean Species density (Area - <br />weighted) in the SBR reference area was 69 percent (Table 6-3), exceeding 90% of the standard <br />(0.9 x 70% = 63%). Hence Alternative Test C is PASSED for 2014 data. <br />10 <br />