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Statistical Testing to Demonstrate Revegetation Success <br />Statistical testing will be used when the parameter sample mean for the reclaimed bond release area is <br />less than 90 percent of the standard. A one - sample t -test will be used in testing the hypothesis that <br />the true mean of the bond release parcel (or monitoring parcel) is indistinguishable from the number <br />representing 90 percent of the standard. One - sample hypothesis testing, as well as the sample <br />adequacy formulas to be used when hypothesis testing is required and when parameter estimation <br />alone is sufficient, will be consistent with the Division's Rule 4.15.11. The parameters to be tested for <br />revegetation success are cover, production, species diversity, and woody plant density. <br />Cover. <br />For all reclaimed II -W areas (including the II -W South Extension area), successful revegetation for the <br />parameter of cover will be evaluated as follows. Cover data will be collected from the above five <br />described vegetation types within the designated extended reference area. Included in the average will <br />be data from the Aspen Woodland, Mountain Brush, Steep Mountain Brush, Sagebrush /Snowberry <br />and Western Wheatgrass /Alkali Sagebrush vegetation types. The extent of herbaceous cover in each <br />of the five vegetation types will be represented by the "all-hit" measure of cover in which the full <br />extent of a species cover, whether or not it is overlapped by the canopy of another species is <br />independently assessed. Although the development of trunks, branches, twigs, and leaves of shrubs <br />and trees overarches fairly extensive areas in several of the vegetation types, the herbaceous <br />component is still quite extensive in most, though often in the shade of the woody species. <br />An average of the herbaceous cover of the extended reference area types, weighted by their extent in <br />the premining area affected by mine disturbance (in the II -W permit area including the South <br />Extension area), will be calculated as per the following formula using "all-hit" total herbaceous <br />vegetation cover data: <br />Xrev�: 0.90 ((A.) ( + (Ab)(Xb) + (A mb) (X.mb) + (A ± (Aww) (X —)) <br />where: <br />X = Average all-hit total vegetation cover for revegetated area <br />A = Aspen type percentage of the premining surface to be affected by mining (11.0 %) <br />Ab = Mountain Brush type percentage of the pre surface to be affected by <br />mining (34.5 0 /.) <br />Asmb = Steep mountain brush type percentage of the pr eminin g surface to be affected <br />MR -66 46 Revised 10/09 <br />