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SPECIES DIVERSITY <br />t = Q - x <br />s- <br />x <br />Where: x = Bond Release Block Sample Mean <br />Q = 90% of Standard <br />S- = Standard error of mean [ s/ ] <br />S = Sample standard deviation <br />n = Sample size <br />t = Calculated t value <br />t = Table t value (alpha = 0.1) <br />The (traditional) null hypothesis being tested would be that the bond release block mean (.t) was greater <br />than or equal to 90% of the standard, stated as H µ >_ Q. If t. was less than or equal to the 1- tailed t table <br />value for alpha error probability of 0.10, at (n -1) degrees of freedom, then H was not rejected, and <br />revegetation was deemed successful. <br />For purposes of assessment of progress toward bond release standards, species diversity is judged using <br />the following four tests present in the provisions of the permit; success is demonstrated by passing the first <br />(A) and at least two of the remaining three (B, C, and D). <br />Mandatory Test A): No Overwhelming Dominant <br />No single plant species may exceed 60% relative cover. <br />Altemative Test B): Total Species Density Test <br />In this test, overall reclamation diversity standard is judged based on the species density values observed <br />along with cover sampling in 100 sq.m. sample plots. Species density numbers are subjected to sample <br />adequacy assessment in the usual manner. <br />9 <br />