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~ ~' <br />100-year flood elevation for North Thompson Creek in the area of the <br />embankment is less than a 30 elevation. Since this embankment doesn't <br />extend below a 30 elevation, with the exception of a small area in the <br />vicinity of Section C-C, it appears the embankment is out of the 100-year <br />flood plain and there will be not need for rip-rap. This will be con- <br />firmed in the field before final design if the earthen embankment alter- <br />native is selected for construction. <br />At this time Snowmass Coal Company is reviewing these two sedimentation <br />structure alternatives to determine which will best suit our needs and <br />meet the requirements of the Colorado Mined Land Reclamation Division. <br />Your comments in regard to this matter would be greatly appreciated. <br />If you desire further information, or if I can help in any way with your <br />evaluation, please let me know. <br />Sincerely, <br />Craig A. Sherwood <br />Environmental Coordinator <br />~. <br />Encl ~~, <br />as <br />CAS:jm <br />7 <br />