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ephemeral stream where the upstream watershed ~s larger than one square mile and in intermittent or <br />perennial streams unless specifically approved by the Division. Stream fords of an ephemeral stream <br />• when the upstream watershed is larger than one square mile and intermittent or perennial stream will <br />be approved by the Division before construction proceeds. All other stream crossings will consist of <br />culverts in flowing streams, consistently wet areas, and in ephemeral channels as necessary to allow <br />passage and to minimize disturbance of the hydrologic balance. Light-use roads planned to be used for <br />a period of less than six months will utilize temporary culverts, where required, designed to safely pass <br />the 1 -year, 6-hour precipitation event. Light-use roads planned to be used for a period of more than <br />six months will utilize culverts designed to safely pass the 10-year, 24-hour precipitation event (see <br />Table t 3-3, Culvert Statistical. Attachment t 3-8, Culvert Calculations, provides calculations for <br />generic culvert sizes for proposed light use roads. Ditches and drainage control will be established <br />during construction and maintenance of the roads to minimize erosion and to assist traffic passage. <br />Design and Construction. Light-use roads will 6e field engineered to follow the existing topography as <br />much as practicable. Topsoil will be removed and stockpiled in accordance with the topsoil salvage <br />plan. The horizontal and vertical alignment will be dictated by the topography and the need to avoid <br />obstructions. Light-use road surfacing material will be adequate for the use of the road. Acid or toxic- <br />forming substances will not be used in the road surfacing. Light-use roads will be maintained to <br />minimize erosion and to allow passage of traffic. <br />Reclamation. SCC will reclaim alight-use road when it is no longer needed in accordance with the <br />reclamation plan. The road will be closed to vehicular traffic. The natural drainage patterns will be <br />restored. All culverts will be removed. Roadbeds will be ripped, plowed or scarified. Cut and fill <br />slopes will be rounded or reshaped and blended into the surrounding topography. Cross drains, dikes <br />or water bars may be constructed to control erosion as required. Road surfaces from which topsoil <br />has been removed will be covered with topsoil and revegetated in accordance with the reclamation <br />plan. <br />Deadhead Road. A temporary deadhead road will need to be constructed for the dragline to cross <br />Annand Draw to access the mining area on the west. The site, shown on Exhibit 13-11 .3, Proposed <br />Haul B Extension, was chosen for two reasons. First, it is in an area that has been partially disturbed <br />and secondly, (and more important) i[ is the closest location available to the existing powerlines <br />crossing Annand Draw to the main substation that SCC can use due to MSHA rules and regulations, <br />the location also minimizes the amount of additional topsoil disturbance. The horizontal and vertical <br />alignments for this proposed deadhead road are depicted on Exhibit 13-11,3, Proposed Haul Road 8 <br />Extension. Final reclamation of this deadhead road and the existing pit ramp will take place once all <br />• coal has been removed from the current mining area and reclamation of the current mining area has <br />31 Revised 5/99 <br />