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28.9 — 4,66 = 33.5 <br />2) Sample Adequacy Expression <br />d— <br />= 0.161 <br />_ i 2 N <br />1.740 <br />23.9 23.9"' * 18 <br />_c + 28.9 +(23.9 • 4,161)= 33.5 <br />33.5% allowable herbaceous cover represents with 90% confidence the highest possible value of the true <br />mean for the Mountain Brush Reference Area. <br />[Note in the above calculations, two - tailed t values with n -1 degrees of freedom are used. We are <br />concerning ourselves with the full range of possible values for mean, thus bi- directional concerns are <br />evident. From the CDRMS point of view this pushes the limits out further and produces the highest <br />maximum value for the mean (at 90% confidence).] <br />Calculation of 90 %of the cover performance standard appropriate for 2012 sampling using the highest <br />possible value for the Mountain Brush Reference Area component is demonstrated below. <br />Aspen Reference Area Allowable All -Hit Herbaceous Cover' = 53.7% <br />Mountain Brush Reference Area Allowable All -Hit Herbaceous Cover (Upwardly Adjusted)' = 33.5% <br />Sagebrush Reference Area Allowable All -Hit Herbaceous Cover' = 30.8% <br />Steep Mountain Brush Reference Area Allowable All -Hit Herbaceous Cover' =14.9% <br />' Herbaceous cover adjusted by subtracting noxious weeds and annual /biennial plant cover in excess of 10% of the remainder. <br />90% of the Cover Standard = <br />0.90* [0.244(53.7 %) +0.489(33.5 %) +0.24(30.8 %) +0.027(14.9 %) = 33.5 <br />The mean allowable all -hit herbaceous vegetation cover sampled in 2012 BRB -1 was 47.9 %, exceeding <br />33.5 %, which is 90% of the upwardly adjusted cover performance standard. (see also Figure C -1, Table <br />C -1). This direct comparison of reclaimed area mean to standard is allowed under DRMS rules (CDMG <br />2005 revised rule, 4.15.11 (2)(a)) when sample adequacy has been demonstrated for the reclaimed area. <br />19 <br />