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4. CONCLUSIONS AND RECOMMENDATIONS <br />• 4.1. Specific Conclusions <br />Engineering and geomorphic analysis of the Colorado Yampa Coal <br />Company Eckman Park Mine existing versus approved postmining topography <br />provides the following conclusions: <br />1. Existing hillslopes are not significantly different from <br />approved hillslopes. <br />2. Existing valley side-slopes are significantly less than approved <br />valley side-slopes. This should improve the stability of these <br />slopes. <br />• 3. Drainage density has increased slightly due to mining and <br />reclamation, however, the change is within the limits of natural <br />variation in drainage density. Increased drainage density <br />should enhance the stability of the drainage network. <br />4. Material (i.e., spoil) has not been significantly rearranged by <br />mining and reclamation. <br />5. The swale at the top of the mine is not inconsistent with <br />surrounding natural landforms. <br />6. Hillslope gradients along the upper portions of the swale are <br />within the range of natural gradients found along colluvial <br />• slopes. <br />39 <br />