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X, — ((0. 9FXro r) <br />t= & <br />Where: <br />t = calculated t -value <br />Xb1 = bond release site (reclaimed site) sample mean <br />X ,.f = reference area sample mean <br />The null hypothesis being tested is that the mean value for the reclaimed site is less than or <br />equal to Q. If the calculated t value is greater than the table t value (alpha = 0.20, dfS,), then <br />the null hypothesis is rejected and revegetation is deemed successful for the parameter in <br />question. <br />It is requested that the success standards for species diversity, shrub density and seasonal <br />variety be waived for the dryland pasture type. The postmining land use for the New Horizon 2 <br />area is pastureland, which is consistent with the pre- mining land use. This type will occur within <br />the Reclaimed Irrigated Pastureland type. In addition, ranchers within the New Horizon 2 study <br />area indicated a desire to replace the present areas containing sagebrush with a more <br />productive community oriented towards livestock. The present sagebrush type (formerly <br />sagebrush and pinyon - juniper dominated vegetation; see Attachment 2.04.10-7, (Peabody <br />Addendum 10 -3) is not being reclaimed because it is only a minor type reflecting a vegetative <br />composition that has resulted in a stand dominated by increased and undesirable species. The <br />present stands are not critical or unique habitat for wildlife, nor do they constitute any real <br />wildlife value when one considers the extensive native vegetation in the immediate Nucla area <br />and the habitat resulting from irrigation along with the large trees and shrubs in farmsteads in <br />the area. <br />August 2013 PR -08 2.05.4(2)(e) - 63 <br />