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General Requirements. SCC will construct, maintain and reclaim access roads to minimize erosion and <br />siltation, air and water pollution and damage to public and private property. To the extent possible, • <br />using the best technology currently available, access roads will not cause damage to fish, wildlife, or <br />related environmental values and will not cause additional contributions of suspended solids to <br />streamflow or to runoff outside the permit area. Any such contribution shall not be in excess of <br />limitations of State or Federal law. The locations of access roads will be shown on Exhibit 12-2 dnd a <br />typical cross section is shown on Figure 13-5. <br />The access roads at the mine site will be designed with appropriate ditches, grades, and culverts to <br />control erosion and runoff. All access roads will be constructed basically "on-grade" and the location <br />will be partially limited by the grades of the existing or postmining areas. Stream fords will not be used <br />during construction of roads unless approval is first obtained from the regulatory authority. <br />Location. SCC will locate access roads on ridges or on a stable slope in order to minimize erosion, No <br />part of any access road will be located in the channel of an ephemeral stream where the upstream <br />watershed is larger than one square mile or in intermittent or perennial streams unless specifically <br />approved by the Division. Stream fords of ephemeral streams when the upstream watershed is larger <br />than one square mile and intermittent or perennial stream will be approved by the Division before <br />construction 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 minimize <br />disturbance of the hydrologic balance. Access roads will utilize culverts designed to safely pass the 10- • <br />year, 24-hour precipitation event Isee Tables 13-5 and 13-6, Culvert Statistical. Ditches and drainage <br />control will be established during construction and maintenance of the roads to minimize erosion ahd to <br />assist traffic passage. <br />Design and Construction. The design of the access roads incorporate the demand for mobility and <br />travel efficiency, based on the geometric criteria appropriate for the anticipated volume of traffic, <br />weigr5t anc' speed' of the verlicies to de utiiizec: <br />Access roads will be designed and constructed or reconstructed in compliance with the follovring <br />standards in order to control erosion and disturbance of the hydrologic balance. Topsoil will be <br />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 grade. Maximum <br />pitch grade will not exceed 15 percent, and there will not be more than 300 feet of pitch grade <br />exceeding 10 percent within any consecutive 1,000 feet. <br />The horizontal alignment will be consistent with the existing and postmining topography and will be <br />coordinated with the vertical alignment to ensure that the roads will not cause excessive environmental • <br />damage. <br />TR-42 30 Revised 9/03 <br />