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Table 8 Colowyo - Success Testing - 2008 & 2009 Pass <br />Phase III - Bond Release <br /> Phase III <br />2008 Phase III <br />2009 <br />STANDARDS <br />VegetationCover <br />Perennial Mean (x) G <br />Standard (Q = 55% Mountain Shrub + 45% Sagebrush) 45.9 47.9 <br />90% of Standard 41.3 43.1 <br />Number of Samples (n) 26 26 <br />Standard Deviation (s) 11.45 11.60 <br />Calculated t-statistic [t*=(x- -0.9Q)/(s/ n)] 10.17 12.10 <br />Tabular value fort 0.9,n-1 One Tailed t - Test) 1.32 1.32 <br />Production <br />Perennial Mean (Y) <br />3. <br />Standard (Q = 55% Mountain Shrub + 45% Sagebrush) 474.6 609.2 <br />90% of Goal 427.1 548.3 <br />Number of Samples (n) 40 40 <br />Standard Deviation (s) 36.35 35.86 <br />Calculated t-statistic It* = (z - 0.9Q)/(s n)] 248.17 250.76 <br />Tabular value fort 0.9,n-1) One Tailed t - Test 1.30 1.30 <br />Diversity <br />Perennial Grass Species Z <br />9 <br />Standard (species with between 3% - 50% Relative Cover) 2 1 2 <br />Forb Cover <br />Standard (Relative Cover between 1% and 50%) 10/0:5c:5500/0 1%:5c:550% <br />Woody Plant Density <br />Shrubs per Acre . `?;' <br />Standard 150.0 <br />Percent of Acreage that has a Shrub Population o 0 <br />Standard 3.0% <br />c= combined total composition or relative cover for all perennial forbs (non-noxious) <br />CEDAR CREEK ASSOCIATES, Inc. Page 26 Colowyo Coal Company <br />2009 Phase III Bond Release Evaluation