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Harry Ranney <br />May 29, 2003 <br />Page 4 <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 k is Iess 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 Dryland Reference Area and the two reclaimed areas will <br />be evaluated using data on vegetative ground cover acquired from the point-intercept transects. An <br />evaluation of species diversity will be derived from data acquired during the June and August <br />sampling events. Data from the transects will be analyzed by implementing Equation 4 to calculate <br />the relative cover of each species detected. <br />(4) <br />Relative Cover of Species X = ° ~ Cover of Species X <br />/o Total Vegetative Cover <br />Post-mining success ofspecies diversitywitl be evaluated bycomparing the relative cover values of <br />the reclaimed areas with the values ascertained within the reference area vegetation community. The <br />species diversity standard for the two reclaimed dryland sample units is the establishment of two <br />cool-season grasses, one warm-season grass, and one perennial forb, each with a relative cover value <br />between 3 and 60 percent. There is no cover requirement for shrub species. <br />Kaiser will submit data obtained during the 2003 sampling event in the fall of 2003. <br />We plan to conduct sampling for vegetative ground cover, herbaceous production, and species <br />diversity on June 16 through June 19, 2003.Additionally, we plan to sample for vegetative ground <br />cover and species diversity on August 4 through August 7, 2003, which is near the peak growing <br />season for warm-season grasses. Three maps that display the planned sample locations for the three <br />sample areas are attached to the end of this study plan. If you have any questions or need additional <br />information on our scope of work, please call me at (303) 850-0930. We welcome all comments <br />from the CDMG. <br />Sjpcerel ,_ /,~~ <br />huck Florian <br />Staff Ecologist <br />