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Vegetation Type <br />Allowable Herbaceous <br />Cover on a first -hit basis* <br />% of Pre - mining Area <br />Mountain Brush <br />15.1 <br />83.0 <br />Sagebrush <br />44.7 <br />17.0 <br />are evident. From the CDRMS point of view this pushes the limits out further and produces the <br />highest maximum value for the mean (at 90% confidence).] <br />It is our assertion that the above approach of taking the highest possible value of the mean as the <br />standard for the Mountain Brush Reference Area protects the interest of the State by using the <br />most generous estimate possible of the maximum true value of mean after the minimum fifteen <br />samples had been collected. <br />Assessment of BRB PSCM -2 for Compliance with Phase it Performance Standards <br />Calculation of allowable herbaceous vegetation cover as well as sample adequacy is shown in in- <br />text summary tables above and detailed in tables 1 b, 2b and 2c. <br />Calculation of 90 percent of the cover performance standard appropriate for 2010 sampling is <br />demonstrated below and is based on the following information: <br />* Herbaceous cover adjusted by subtracting noxious weeds and annual/biennial p ant cover in excess of 10% of the <br />remainder. <br />2010 Mountain Brush Reference Area First -hit Allowable herbaceous cover X 2 = 30.2% <br />2010 Sagebrush Reference Area First -hit Allowable herbaceous cover X 2 = 89.5% <br />90 percent of the Cover Standard = 0.90 [0.83 X (30.2) + 0.17 X (89.4)] = 36.2% <br />Calculation of 90 percent of the cover performance standard appropriate for 2010 sampling is <br />demonstrated below. <br />Allowable herbaceous cover of Phase II BRB PSCM -2 (37.5 %) exceeded 90% of the standard <br />(36.2% allowable cover). The bond release block figure is the result of subtracting tree, shrub <br />and non - herbaceous cover (2.1%) and perennial noxious weed cover (0.27 %) and "excess <br />annual /biennial cover" from the observed first -hit total vegetation cover of 39.6 %. <br />A t -test of the (traditional) null hypothesis that the Phase II BRB PSCM -2 allowable cover is <br />indistinguishable from 90% of the standard is as follows: <br />15 <br />