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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 2010 <br />BRB PSCM -1, Table H -1 shows that the most abundant single species (intermediate wheatgrass) was <br />45.1 % relative first -hit cover, below the 60% threshold of concern. <br />Hence Mandatory Test A is passed for 2010 data. <br />With regard to Alternative Test B, the Total Species Density test the following is calculated for 2010 BRB <br />PSCM -1 (Table H -2): <br />Mean Species density (Area- weighted) in the two reference areas = 31.5 species per 100 sq.m. <br />Mean Reference Area Species Density —1.15 s = 31.5 — 1.15 (5.4) = 25.31 <br />Mean total species density in the 2010 BRB PSCM -1 = 18.67 <br />Mean total species density is less than the standard. <br />Hence Alternative Test B is NOT passed for 2010 data. <br />Regarding Alternative Test C, the similarity index between the lifeform species density values for the <br />prescribed lifeforms for 2010 BRB PSCM -1 and the Mean Species density (Area - weighted) in the two <br />reference areas is 78.4 percent (Table H -3), exceeding 90% of the standard (0.9 x 70% = 63 %). <br />Hence Alternative Test C is passed for 2010 data. <br />Regards Alternative Test D, the total number of native species encountered in the first nine 100 sq. m. <br />(2m x 50 m) samples of 2010 BRB PSCM -1 that constituted an adequate cover sample was 33, greater <br />than the weighted reference area average species density (28.7 species per 100 sq.m.). <br />Hence Alternative Test D is passed for 2010 data. <br />In summary, Mandatory Test A was passed as were Alternative Tests C and D and hence the species <br />diversity test as a whole is passed for 2010 BRB PSCM -1. <br />23 <br />