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+ d = 12.80 + (12.80 * 0.1580) = 14.82 <br />24.39 percent allowable herbaceous cover represents the highest possible value of the true mean for the <br />Mountain Brush Reference Area. <br />[Note in the above two- tailed t values with n -1 degrees of freedom are used. We are concerning <br />ourselves with the full range of possible values for mean, thus bi- directional concerns are evident. From <br />the CDRMS point of view this pushes the limits out further and produces the highest maximum value for <br />the mean (at 90% confidence).] <br />Calculation of 90 percent of the cover performance standard appropriate for 2011 sampling using the <br />highest possible value for the Mountain Brush Reference Area component is demonstrated below. <br />Mountain Brush Reference Area Allowable First -Hit Herbaceous Cover *(14.8 %) X 2 = 29.6% <br />Sagebrush Reference Area Allowable First -Hit Herbaceous Cover *(44.7 %) X 2 = 89.4% <br />90 percent of the Cover Standard = 0.90 [0.83(29.6 %) + 0.17(89.4 %)] = 35.8% <br />* Herbaceous cover adjusted by subtracting noxious weeds and annual /biennial plant cover in excess of 10% of the remainder. <br />The mean allowable first -hit herbaceous vegetation cover sampled in 2010 BRB PSCM -1 was 54.9 <br />percent, exceeding 35.8 percent, which is 90 percent of the upwardly adjusted cover performance <br />standard (see also Figure C -1, Table C -1). Thus for 2010, successful revegetation with respect to <br />allowable first -hit herbaceous cover is indicated. <br />HERBACEOUS PRODUCTION <br />Calculation of 90 percent of the cover performance standard appropriate for 2010 sampling is <br />demonstrated below. <br />Mountain Brush Reference Area Allowable herbaceous production* = 483.6 lbs/acre <br />Sagebrush Reference Area Allowable herbaceous production *= 874.3 lbs/acre <br />90 percent of the Production Standard = 0.90 [0.83(483.6) + 0.17(874.3)] = 495.0 lbs/acre <br />* Herbaceous cover adjusted by subtracting noxious weeds and annual/biennial plant cover in excess of 10% of the remainder. <br />As can be seen in Figure 2, the 2010 BRB PSCM -1 mean allowable herbaceous production of 1974 <br />pounds per acre far exceeded 90 percent of the production performance standard (495 lb/ac). The <br />average annual and biennial sampled 2010 BRB PSCM -1 production was not greater than 10 percent of <br />20 <br />