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• <br />INTRODUCTIOPI <br />Drainage and sediment control for the Mt. Harris Coal Company Loadout <br />Facility is both simple and difficult at the same time. It is simple <br />from the standpoint that the area is a small closely contained area <br />which represents an easily controlled runoff situation. It is also <br />difficult to design a drainage and sediment control plan for the Mt. <br />Harris Loadout facility because of the very flat nature of the <br />topography at the facility. <br />This drainage and sediment control plan was designed to assure <br />compliance with the rules and regulations of the Colorado Mined Land <br />Reclamation Board. An important aspect of this Drainage and Sediment <br />Control Plan is the total containment of the 10-year, 24-hour <br />precipitation event. The 10-year, 24-hour precipitation event is <br />totally contained by means of a berm surrounding the facilities area and <br />a sediment pond which is sized to contain not only the runoff from the <br />• 10-year, 24-hour precipitation event but also 3 years for the sediment <br />accumulation from the disturbed area. The sediment pond is designed to <br />have sufficient capacity to contain this volume without discharging. <br />For events larger than the 10-year, 24-hour precipitation event the <br />sediment pond will discharge water through the emergency spillway. <br />This drainage and sediment control plan consists of calculations and <br />maps. The calculations are grouped under the following headings: <br />• Hydrologic calculations <br />• Sediment calculations <br />• Hydraulic calculations <br />There is also a map associated with the drainage and sediment control <br />plan (Map 7). The Drainage and Sediment Control Plan Map (Map 7), show <br />the location of the drainage and sediment control features and gives the <br />details of those features. The drainage and sediment control plan <br />• consists of a berm, a sediment pond and two culverts. <br />-1- <br />