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C� <br />Colowyo Coal Company L.P. <br />C. Revegetation Success Demonstration <br />Pursuant to Rule 4.15.8(3), Phase II bond liability release will be considered acceptable if the <br />vegetative establishment on the reclaimed land meets the requirement of 90% herbaceous cover <br />of the reference area standard with 90% statistical confidence. Please see Appendix B for <br />information addressing vegetation establishment and sample locations. <br />D. Erosion Control <br />All rills and gullies that may have occurred during the initial years of revegetation were <br />mitigated when they occurred. Erosion control methods implemented for these Phase II areas <br />have been successful and the areas are stable and free of erosion. Successful revegetation efforts <br />have ensured and will continue to guarantee these areas remain free of erosion. <br />E. Sedimentology <br />In accordance with Rule 3.03.3(b), bond liability release cannot be granted until the applicant <br />demonstrates that the existing revegetated area will result in equivalent or lesser sediment <br />contributions to surface runoff when compared with pre -mining levels as determined by baseline <br />data. Please see Appendix B which documents the sediment contributions for the areas being <br />applied for Phase II release. <br />SL -10 Phase III Bond Release Application <br />