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cross section is shown on Figure 13-5. <br />• <br />The access roads at the mine site will be designed with appropriate ditches, grades, and <br />culverts [o control erosion and runoff. All access roads will be constructed basically <br />"on-grade" and the location will be partially limited by the grades of the existing or <br />postmining areas. Stream fords will not be used during construction of roads unless <br />approval is first obtained from the regulatory authority. <br />Location. Peabody will locate access roads on ridges or on a s[ahle slope in order to <br />minimize erosion. Mo part of any access road will be located in the channel of an <br />ephemeral stream where the upstream watershed is larger than one square mile and in <br />intermittent or perennial streams unless specifically approved by the Division. Stream <br />fords of an ephemeral stream when the upstream watershed is larger than one square mile <br />and intermittent or perennial stream will be approved by the Division before construction <br />proceeds. ALl other stream crossings will consist of culverts in flowing streams, <br />consistently wet areas, and in ephemeral channels as necessary [o allow passage and to <br />minimize disturbance of the hydrologic balance. Access roads will utilize culverts <br />designed to safely pass the 10-year, 24-hour precipitation event (see Tables 13-5 and <br />t3-6, Culvert Statistics). Ditches and drainage control will be established during • <br />construction and maintenance of the roads to minimize erosion and to assist traffic <br />passage. <br />Design and Construction. The design of [he access roads incorporate the demand for <br />mobility and travel efficiency, based on [he geometric criteria appropriate for the <br />anticipated volume of traffic, weight and speed of the vehicles to be utilized. <br />Access roads will be designed and constructed or reconstructed in compliance with the <br />following standards in order to control erosion and disturbance of the hydrologic balance. <br />Topsoil will be removed and stockpiled in accordance with the topsoil salvage plan. <br />The vertical alignment of the access roads will not exceed 10 percent on the overall <br />grade. Maximum pitch grade will not exceed 15 percent, and there will not be more than <br />300 feet of pitch grade exceeding 10 percent within any consecutive 1,000 feet. <br />The horizontal alignment will be consistent with the existing and postmining topography • <br />and will be coordinated with the vertical alignment to ensure that the roads will not <br />cause excessive environmental damage. <br />30 Fevised 03/13/92 <br />