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<br />E)ffIIBIT II.2-2 <br />•l / SEDIMENT POND DESIGN FOR THE PROPOSED NEW ELK MINE WASTE DUMP <br />INTRODUCTION <br />As part of the coal development activities at the New Elk Mine. Wyoming Fuel <br />Company (WFC) plans to dispose of wastes in a small drainage basin to the <br />north of the exist?~^ ~l•^~ ;:__'~~ ~,°~! of Hallow Ftll technioues. A =chnnatic <br />representation of the existing drainage basin 1s presented on Figure 1. Under <br />the current plan, the small pond that exists near the outflow of the watershed <br />is to be expanded to act as a sedimentation pond for the proposed waste pile. <br />Disposal will proceed 1n 50 feet fiigh lifts with a face slope of 2H:1V. After <br />each lift has reached a height of fifty feet. benches of various widths will <br />::•- <br />be left before beginning the next lift. The benches will be crowned so as to <br />cause runoff to occur along gentle slopes to minimize erosion. <br />The purpose of this report is to present the results of preliminary designs of <br />' the sedimentation pond and the associated channels necessary to minimize <br />erosion of the wastes during and after they are placed. To facilitate the <br />discussion, the report has been divided into the following major sections: <br />- Sediment Pond Design <br />- Sizing of Channels <br />- Conclusions <br />~~ <br />