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Coors Energy Company Keenesburg Mine—Phase III Bond Release Application <br /> Revegetation Success Demonstration <br /> Table 6: Vegetation Cover Success Standard Comparison for 2022 <br /> 2022 <br /> Vegetation Cover Area 29/23 Area 30 Area 31 <br /> Average Allowable Cover(%) 18.9 18.7 22.6 <br /> Technical Standard(%) 19.9 <br /> 90% of Standard(%) 17.9 <br /> T-Test T-Test Direct <br /> Statistical Testing Reverse Null Reverse Null Comparison <br /> Hypothesis Hypothesis <br /> T-Value 0.41 0.34 n/a <br /> T Critical Value -0.854 -0.858 n/a <br /> Standard Passed? Yes Yes Yes <br /> 5.2 Herbaceous Production <br /> An error was made in the annual reports submitted in 2021 and 2022 such that the herbaceous <br /> production reported was in grams per plot(0.5 m2)rather than g/m2. The values presented here <br /> are corrected. Reclamation Areas 29/23, 30, and 31 were all subjected to hypothesis testing with <br /> a reverse null hypothesis in both 2021 and 2022 (Table 7 and Table 8,respectively). All three <br /> areas passed the standard in both years. <br /> Table 7: Herbaceous Production Success Standard Comparison for 2021 <br /> 2021 <br /> Herbaceous Production Area 29/23 Area 30 Area 31 <br /> Average Allowable Production(g/m2) 107.6 87.0 118 <br /> Standard (g/m2) 21.0 <br /> 90% of Standard (g/m2) 18.9 <br /> T-Test T-Test T-Test <br /> Statistical Testing Reverse Null Reverse Null Reverse Null <br /> Hypothesis Hypothesis Hypothesis <br /> T-Value 2.68 4.90 6.60 <br /> T Critical Value -0.854 -0.854 -0.854 <br /> Standard Passed? Yes Yes Yes <br /> Table 8: Herbaceous Production Success Standard Comparison for 2022 <br /> 2022 <br /> Herbaceous Production Area 29/23 Area 30 Area 31 <br /> Average Allowable Production(g/m2) 91.4 66.4 69.8 <br /> Standard (g/m2) 11.0 <br /> 90% of Standard(g/m2) 9.9 <br /> T-Test T-Test T-Test <br /> Statistical Testing Reverse Null Reverse Null Reverse Null <br /> Hypothesis Hypothesis Hypothesis <br /> T-Value 4.07 5.28 4.94 <br /> T Critical Value -0.854 -0.854 -0.854 <br /> Standard Passed? Yes Yes Yes <br /> SL-12 10 May 2024 <br />