2019-09-10_REVISION - C1994082 - Laserfiche WebLink

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25.63% allowable herbaceous cover represents with 90% confidence the highest possible value of the true mean for the Mountain Brush Reference Area in 2015. Cover Success Evaluations Calculation of 90 percent of the cover performance standard determined from 2015 and 2016 sampling is demonstrated below based on the reference area data that is weight averaged by type. The approximate weighting contribution is aspen 24.4%,mountain brush 48.9%,sagebrush 24.0%, and steep mountain brush 2.7%. 2015 Calculation of the cover performance standard for 2015 sampling data and using the highest possible value for the Mountain Brush Reference Area component as described above, is demonstrated below. Aspen Reference Area Allowable All-Hit Herbaceous Cover' = 84.8% Mountain Brush Reference Area Allowable All-Hit Herbaceous Cover' =47.1% Sagebrush Reference Area Allowable All-Hit Herbaceous Cover' =40.7% Steep Mountain Brush Reference Area Allowable All-Hit Herbaceous Cover' =25.6%2 'Herbaceous cover adjusted to allowable by subtracting noxious weeds and annual/biennial plant cover in excess of 10%of the remainder. z Highest possible value of the true mean calculation The calculation of 90 percent of the 2015 Cover Standard= 0.90* [0.244(84.8%) +0.489(47.1%) +0.24(40.7%) +0.027(25.6%)] =48.7% The 2015 mean allowable all-hit herbaceous vegetation cover sampled in the BRB-2 area was 69.8 percent, exceeding the cover standard of 48.7 percent(90 percent of the upwardly adjusted cover performance standard) and success is demonstrated. This direct comparison of reclaimed area mean to standard is allowed under DRMS rules (CDMG 2005 revised rule, 4.15.11 (2)(a)). [Note that were the Steep Mountain Brush Reference Area mean (22.7%) not upwardly adjusted to the maximum value (25.63%) for the calculation of the performance standard, 90% of the cover standard would have been remained at 48.7%]. SL-7 - 11