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Lastly, a one -sided reverse -null t-test with alpha = 0.20 is used as follows: <br />X br_( (O-9 F X rtf) <br />t= <br />CV <br />Where: <br />t = calculated t -value <br />Xb1 = bond release site (reclaimed site) sample mean <br />Xref = 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, dfsa), 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 <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 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 <br />not 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 />(Revised: PR -06) 2.05.4(2)(e) - 65 <br />