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West Elk <br />Small Area Exemption (SAE) <br />Lone Pine Gulch Development Waste Pile <br />1. INTRODUCTION <br />1.1 Methods of Analysis <br />This review and analysis is made using the Sediment Erosion, Discharge by Computer Aided Design <br />(SEDCAD+ Version 3) developed by Ms. Pamela J. Schwab of Civil Software Design and Dr. Richard C. <br />Warner, Agricultural Engineering Department, University of Ken[ucky. The analyses are based on field <br />information provided by Kathleen Welt (Environmental and Engineering Supervisor) and Henry Barbe <br />(Environmental Assistant), West Elk Mine, Mountain Coal Company, a site visit by the undersigned; and other <br />sources as referenced herein. <br />1.2 Project Description <br />The project is a proposed development waste pile associated wi[h slopes being developed for the Lone Pine <br />Fan installation. <br />1.2.1 Location <br />The loption of [he proposed development waste pile is shown on Drawing LPG-103F, 729194, Lone Pine <br />Gulch Fan/Porral Bench Design (Enclosure 1). It would be constructed as fill on an existing slope. <br />1.2.2 Configuration <br />Enclosure 2 is a sketch of the fully constructed developmen[ waste pile. The pile would rise 25 fee[ above the <br />upper toe-of-slope and 55 [eet above the lower toe-of-slope. It would cover approximately 0.70 acre. Slopes <br />of [he pile would be a[ approximately ZS (horizontal) [0 1 (ver[ipl). <br />The developmen[ waste pile will be pro[ected from erosion and water resources will be pro[etted from <br />pollution by a number of but management practices. The construction of [he proposed developmen[ waste <br />pile would occur over a period of [ime as scopes (adds) are developed for the Lone Pine Fan installation. <br />Thus implementation of the practices will be phased over a period of time. These practices include: <br />1) a wa[ershed runoff interceptor ditch above the pile. This interceptor ditch will protett the pile <br />from runoff from the wa[ershed above the pile. it is designed to divett runoff from a 100-year, <br />2d-hour storm event. It would be looted a minimum of 10 feet above the upper toe of slope <br />circumvential ditches, and would flow to the west. It would be extended a sufficient distance <br />beyond the pile so that runoff discharge would have no impac[ on the pile. The west end of the <br />diversion ditch would be feathered so as to disperse runoff in sheetflow over undisturbed <br />(Wat Elk SAE. Lone Pine Gulch Development Wuie Pile Page 1 of 6) <br />