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Where: <br />t = calculated t -value <br />X = bond release site (reclaimed site) sample mean <br />X,,� = reference area sample mean <br />The null hypothesis being tested is that the mean value for the reclaimed site is less than or equal <br />to Q. If the calculated t value is greater than the table t value (alpha = 0.20, df then the null <br />hypothesis is rejected and revegetation is deemed successful for the parameter in question. <br />It is requested that the success standards for species diversity, shrub density and seasonal variety <br />be waived for the dryland pasture type. The postmining land use for the New Horizon 2 area is <br />pastureland, which is consistent with the pre- mining land use. This type will occur within the <br />Reclaimed Irrigated Pastureland type. In addition, ranchers within the New Horizon 2 study area <br />indicated a desire to replace the present areas containing sagebrush with a more productive <br />community oriented towards livestock . The present sagebrush type (formerly sagebrush and <br />pinyon - juniper dominated vegetation; see Attachment 2.04.10-7, (Peabody Addendum 10 -3) is not <br />being reclaimed because it is only a minor type reflecting a vegetative composition that has <br />resulted in a stand dominated by increased and undesirable species. The present stands are not <br />critical or unique habitat for wildlife, nor do they constitute any real wildlife value when one <br />considers the extensive native vegetation in the immediate Nucla area and the habitat resulting <br />from irrigation along with the large trees and shrubs in farmsteads in the area. <br />The dryland pasture areas are composed of species that can withstand natural grazing pressure <br />and continue to protect the resource. Seed Mix #8 has been designed to achieve this. The <br />species present will supply forage during green -up periods early in the spring and later in the fall, <br />though some use may be made during the summer. The productive and desirable forage species <br />in the dryland pasture will be used during the summer and fall months negating the need for <br />seasonal variety in the dryland pasture type. Additionally, the presence of the productive and <br />palatable species in the Reclaimed Irrigated Pastureland will concentrate animals there, reducing <br />potential grazing impacts to the dryland pasture type. As discussed earlier, relatively simple mixes <br />are more desirable for pasture than complex mixes. <br />PR -06 June 2010 2.05.4(2)(e) - 62 <br />