2015-12-11_PERMIT FILE - C1981008 (2)

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2. Location WFC will locate light -use roads on ridges or on a stable slope in order to minimize erosion. No part of any light use road will be located in the channel of an ephemeral stream where the upstream watershed is larger than one square mile and in intermittent or perennial streams unless specifically approved by the CDRMS. Stream fords of an ephemeral stream when the upstream watershed is larger than one square mile and intermittent or perennial stream will be approved by the CDRMS before construction proceeds. All other stream crossings will consist of culverts in flowing streams, consistently wet areas, and in ephemeral channels as necessary to allow passage and to minimize disturbance of the hydrologic balance. Light -use roads will utilize culverts designed to safely pass the 10 -year, 24-hour precipitation event. Ditches and drainage control will be established during construction and maintenance of the roads to minimize erosion and to assist traffic passage. The 5th Street Light Use Road starts on the southeast corner of the permit area and proceeds north along the overburden stockpile and enters the old 5th Street at Station 23+50. The road then continues west to Station 53+80 which is west of Pond 007. 3. Design and Construction Light -use roads will be field engineered to follow the existing topography as much as practicable. Topsoil will be removed and stockpiled in accordance with WFC's topsoil salvage plan. The horizontal and vertical alignment will be dictated by the topography and the need to avoid obstructions. Light -use road surfacing material will be adequate for the use of the road. Acid or toxic -forming substances will not be used in the road surfacing. Light -use roads will be maintained to minimize erosion and to allow passage of traffic. The plan and profile of the 5Th Street Road is shown on Map 2.05.3(3)-8 Mine Roads. As shown on the map, the road is 5380 feet long and actually starts on the southeast corner of the permit area, near Lincoln Avenue, south of 5th Street. As seen in the profile on the same map, the road has a grade of between 0% and 4% grade and an average width of 30 feet. All temporary drainage crossings are designed for the 10 year 24 hour event and all permanent drainage crossings are designed for the 100 year 24 hour event, as shown on Map 2.05.3(3)-1 Surface Hydrology and Attachment 2.05.3(3)-1-3 Collection/Diversion Culverts and Ditches. The map shows the details of the drainage basins and the Attachment shows the designs of the culverts and roadside ditches. The same equipment and procedures for compaction that are described in the Demonstration for the NE Perimeter Haul Road were also used for this road. The road has been in place since 1993 without any problems of stability, erosion, puddling, crown problems, or any other issue that Page 2.05.3(3)-33 October 2015 (TR -69)