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III ~II~I~~II~~II III <br />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 ]. Schwab of Civil Software Design and Dr. Richard C. <br />Warner, Agricultural Engineering Department, University of Kentucky. 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 ocher <br />sources as referenced herein. <br />1.2 Project Description <br />The projec[ is a proposed development waste pile associated with slopes being developed for the Lone Pine <br />Fan installation. <br />1.2.1 Location <br />The location of the proposed development waste pile is shown on Drawing LPG-103F, 729/94, Lone Pine <br />Gulch Fan/Portal 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 development waste pile. The pile would rise 25 feet above the <br />upper tce-of-slope and 55 feet above the lower tce-of-slope. It would cover approximately 0.70 acre. Slopes <br />of the pile would be at approximately 2.5 (horizontal) to 1 (vertical). <br />The development waste pile will be protected from erosion and water resources will be protected Crom <br />pollution by a number of best management practices. The construction of the proposed development waste <br />pile would occur over a period of time as slopes (adits) 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 watershed runoff interceptor ditch above the pile. This interceptor ditch will protect the pile <br />from runoff from [he watershed above the pile. It is designed to divert runoff from a 100-year, <br />24-hour storm event. It would be located 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 impact on the pile. The west end of [he <br />diversion ditch would be feathered so as to disperse runoff in sheetflow over undisturbed <br />(West Elk SAE. Lone Pine Gulch Development Waxte Pile. Pape i of 8) <br />