2011-02-28_REVISION - C1994082 (7)

Home Browse Search

(Weighting proceeded in accordance with the 24.4 % original extent of Aspen / 48.9% original extent of Mountain Brush / 24.0% original extent of Sagebrush/Snowberry/ and 2.7% original extent of Steep Mountain Brush. Cover by noxious weeds was not allowable. Cover by annual/biennial plants in excess of 10% relative cover was also not allowed. The Aspen, Mountain Brush, Sagebrush/Snowberry, and Steep Mountain Brush Reference Areas were sampled to adequacy to establish the standards for comparison against reclaimed area values. If, after 15 cover samples were completed in the 2010 Phase II BRB, sample adequacy has been achieved and the reclamation area mean total herbaceous foliar cover are above 90% of the reference area-derived standard, an affirmative indication of Phase II reclamation cover success was asserted. Were, after gathering 15 or more samples from the BRB, the mean allowable herbaceous cover of the BRB to be greater than the reference area standard, then the hypothesis of reclamation success would be tested using a parametric test of the "reverse null" hypothesis. This would be conducted using the following expression (CDMG 2005 revised rule, 4.15.11 (2)(c)): • - tc _ x Q S_ Where: X = Bond Release Block Sample Mean Q = 90% of Standard S_ =Standard error of mean [sl F] X S = Sample standard deviation n = Sample size tc = Calculated t value tt =Tablet value (alpha= 0.2) see Rohlf and Sokal (1969) The (reverse) null hypothesis being tested would be that the bond release block mean ([L) was less than or equal to 90% of the standard, stated as Ho: µ <_ Q. If tc was greater than the 1-tailed t table value for alpha error probability of .20, with- (n-1) degrees of freedom then Ho would be rejected, and revegetation would be deemed successful. Were the mean allowable herbaceous cover of an adequate sample from the 2010 Phase II BRB less than 90% of the cover standard (see above), then a one-sample t-test would be made in the ESCO Assoc. E-6