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Table Colowyo - Success Testing - 2008 Pass <br />Phase III - Bond Release <br />F 2007 2008 <br />DS <br />atio n Cover <br />Perennial Mean ( x-) 67.8 66.5 <br />Standard (Q = 55% Mountain Shrub + 45% Sagebrush) 47.1 45.9 <br />90% of Standard 42.4 41.3 <br />Number of Samples (n) 30 30 <br />Standard Deviation Perennial Cover (s) 8.47 11.40 <br />Calculated t-statistic [t* = (x- - 0.9Q)/(s n)] 16.43 12.10 <br />Tabular value for t (0.9,n-1) (One Tailed t - Test) 1.31 1.31 <br />Production <br />Perennial Mean ( ? 1803.4 1936.2 <br />Standard (Q = 55% Mountain Shrub + 45% Sagebrush) 612.7 474.6 <br />90% of Goal 551.4 427.1 <br />Number of Samples (n) 45 45 <br />Standard Deviation Perennial Production (s) 631.13 588.47 <br />Calculated t-statistic [t* = (x- - 0.9Q)/(s n)] 13.31 17.20 <br />Tabular value for t (0.9,n-1) (One Tailed t - Test) 1.30 1.30 <br />Diversity (species with between 3% - 50% Relative Cover) <br />Perennial Grass Species <br />Standard 7 <br />2 7 <br />2 <br />Perennial Forb 15.8% 22.1% <br />Standard (Relative Cover between 1% and 50%) 1%<_c<_50% 1%<_c<_50% <br />Woody Plant Density <br />Shrubs per Acre 419.6 419.6 <br />Standard 150.0 150,0 <br />Percent of Acreage that has a Shrub Population 3.6% 3.6% <br />Standard 3.0% 3.0% <br />mommmmod <br />c= combined total composition or relative cover for all perennial forbs (non-noxious) <br />CEDAR CREEK ASSOCIATES, Inc. Page 27 Colowyo Coal Company <br />2008 Phase III Bond Release Evaluation