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• minimize erosion and siltation, air and water pollution and damage to public and private <br /> property. To the extent possible, using the best technology currently available, access <br /> roads will not cause damage to fish, wildlife, or related environmental values and will <br /> not cause additional contributions of suspended solids to streamflow or to runoff outside <br /> the permit area. Any such contribution shall not be in excess of limitations of State or <br />Federal law. The locations of proposed access roads are shown on Exhibit 12-2 and 12-3 <br />and a typical cross section is shown on Exhibit 13-20. <br />The access roads at the mine site will be designed with appropriate ditches, grades, and <br />culverts to 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 stable slope in order to <br /> minimize erosion. No 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 />• intermitt ent or perennial streams unless specifically app roved by the Division. Stream <br /> fords of an ephemeral stream when the upstream watershed is larger than one square mile <br /> and inter mittent or perennial stream will be approved by t he 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 to 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 Table 13-3, Culvert <br />Specifications). Ditches and drainage control will be established during construction and <br />maintenance of the roads to minimize erosion and to assist traffic passage. <br />Design and Construction. The design of the access roads incorporate the demand for <br />mobility and travel efficiency, based on the 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 erasion and disturbance of the hydrologic balance. <br />Topsoil will be removed and stockpiled in accordance with Peabody's 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 />13-24 Revised 08/19/88 <br />