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' Kent Gorham <br />May 4, 2005 <br />Page 5 <br />The null hypothesis being tested is that the bond release block mean (u) is greater than or equal to <br />90% of the standard (H°: u > Q). If t° is less than or equal to the 1-tailed t table value for alpha error <br />probability of .10 at the appropriate degrees of freedom, then H° is not rejected, and revegetation is <br />deemed successful for the parameter tested. <br />Species Diversity <br />The diversity ofplant species present in the Rangeland Reclaimed Area will be evaluated using data <br />on vegetative ground cover acquired from the point-intercept transects. An evaluation of species <br />diversity will be derived from data acquired during the June sampling event. Data from the transects <br />will be analyzed by implementing Equation 4 to calculate the relative cover of each species <br />detected. <br />(4) <br />Relative Cover of Species X = o ~ Cover of Species X <br />/o Total Vegetative Cover <br />' Post-mining success of species diversity will be evaluated utilizing the relative cover values derived <br />from the data collected along the point-intercept transects conducted on the Rangeland Reclaimed <br />Area. The species diversity standard for the Rangeland Reclaimed Area is the establishment of two <br />' cool-season grasses, two warm-season grasses, and one perennial forb, each with a relative cover <br />value between 5 and 60 percent. <br />Basin will submit an application for Phase III bond release, including data obtained during the 2005 <br />and 2006 sampling events, in the fall of 2006. <br />We plan to conduct sampling for vegetative ground cover, herbaceous production, and species <br />diversity on June 20 through June 23, 2005. Two maps (Figures 1 and 2) that display the planned <br />sample locations for the four sample areas are attached to the end ofthis study plan. If you have any <br />questions or need additional information on our scope ofwork, please call me at (303} 850-0930. We <br />welcome all comments from the CDMG. <br />' Sincerely, ~~ - <br />' ( ~ /~ <br />Chuck Florian <br />Staff Ecologist <br /> <br />