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of drought or other stress incrementally "age" the youthful reclamation sites. In light of this prospect <br />• and the current reality of competition-suppressed forb and woody plant presence, it is appropriate to <br />place the benchmark for what will be taken to currently comprise adequately diverse reclamation in <br />the lower half of the spectrum of diversity of the Reference Areas. <br />Standards. The proposed assessment of adequately diverse vegetational composition at the Yoast <br />Mine) will take the foan of the following four tests; success is to be demonstrated bypassing at least <br />two of the three Alternative Tests (B, C, or D) plus the Mandatory Test (A). <br />• MANDATORYTESTA NoOuerwhelmingDominant <br />No single plant species may exceed 60% relative cover. <br />• ALTERNATIVE TEST B: Total Species Denrity Test <br />This overall reclamation diversity standard will be judged based on the spedes density values observed <br />along with cover sampling in the 100 sq.m. sample plots that accompany the standard cover/spedes <br />• presence samples. Species density numbers will be subjected to sample adequary assessment in the <br />usual CDMG manner. Experience has shown that species density almost always is adequately <br />sampled at the point that cover sampling is adequate and that is usually with the minimum sample <br />number. <br />For purpose of establishing the range of spedes density within the Reference Area, the 75% range of <br />variation would be established as: <br />zxs <br />Where: <br />z =the number of standard deviations (both ways from the mean) encompassing 75% of the <br />normal distribution (= 1.15; see Rohlf and Soka11969, Table P) <br />s = standazd deviation (n-1) <br />• The standard is the point at which the centra175% of the distribution of overall spedes density in the <br />Reference Areas begins. Mathematically this would be: <br />PR-02 42 Revised 01/06 <br />