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SPECIES DIVERSITY AND COMPOSITION <br />With regard to Mandatory Test A, that no single species comprise greater than 60% relative cover in <br />2012 BRB -5, Table H -5 shows that the most abundant single species (alfalfa) was 30.80% relative first -hit <br />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 2012 BRB - <br />5 (Table H -6): <br />Mean Species density (Area - weighted) in the two reference areas = 28.45 species per 100 sq.m. <br />Probability- adjusted density standard: <br />Mean Reference Area Species Density — 1.15 s = 28.45 — 1.15 (4.07) = 23.77 <br />Mean total species density in the 2012 BRB -5 = 21.86 <br />A classic t -test of the assertion that the 2012 BRB -5 Total Species Density is indistinguishable from 90% <br />of the standard is as follows: <br />23.77 — 21.36 <br />t = _ 2 ?51 <br />cc.c _. <br />(5, <br />sr c:. — <br />Critical t (a= 0.1) = 1.307 <br />Since critical t = 1.307 (one - tailed, alpha = 0.2, 35 -1 df) and tca,c is greater than this critical value, <br />Alternative Species Density Test B for Phase Ill in 2012 is NOT passed. <br />Hence Alternative Test B is NOT passed. <br />30 <br />