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• Construction of the haul/plant access road began with the clearing of trees and brush. Topsoil was <br />then removed to the approximate depths indicated on Maps 70-75 and stockpiled for future <br />reclamation. Stockpile locations and quantities are shown on Maps 70 through 75. <br />When embankments were constructed on slopes exceeding 1v:3h, the existing ground was plowed, <br />stepped or if in rock keyed in to increase stability. When embankments were constructed on slopes <br />which were less than 1v:3h the existing ground was scarified prior to placement of fill materials. <br />Only clean materials not containing coal or organic material were used for embankment <br />construction. Materials that contained less than 25 percent of rock larger than six inches were <br />spread in successive uniform layers not exceeding twelve inches in thickness before compaction. <br />Where materials consisted of large size rock or fragmented materials that precluded placing in <br />12 -inch layers, embankments were constructed in uniform layers not exceeding the thickness of the <br />average size of the rock used. Layers did not exceed 36 inches in thickness. The final or top layers <br />of embankments were constructed of materials that were spread and compacted in 12 -inch lifts. <br />The crushed rock base course and surfacing were placed in lifts not exceeding 12 inches and <br />compacted to achieve the required densities. After road construction was completed, all cut and fill <br />slopes were mulched and seeded to minimize erosion. <br />A plant access road parallels the portion of the haul road west of the county road. The entire road <br />was completed prior to operation of the preparation plant, as all coal processing waste had to be <br />disposed of in the refuse area. The access and haul roads between the D Portal Area and County <br />Road 65 were widened in five locations. These "blisters" (see Map 56) were approved for disposal <br />of excess cut found in the D Portal Area. Presently, the blisters serve as extra storage space when <br />needed. They will be reclaimed as if they were part of the haul and access road. Section V.G <br />describes backfilling, contouring and reclamation of surface areas that are disturbed incidental to <br />mining activities (this includes the haul road, access road and blisters). <br />The haul road crosses Rio Blanco County Route 65, a lightly traveled, paved/graveled county road. <br />The haul road crosses two ephemeral streams, the one in Scullion Gulch and a tributary stream to <br />Red Wash. The road crossed the Scullion Gulch stream three times. Any alignment that only <br />crossed Scullion Gulch once required sharp curves and excessive side hill cuts. The alignment <br />selected minimized terrain disturbance as well as provided a safe road. The drainage structures <br />required at these major crossings all had open areas exceeding 35 square feet. In accordance with <br />Section 4.03.1(4)(e)(i), these crossings were designed for the maximum expected discharge from <br />20 -year, 24-hour storm events. The value of maximum rainfall used for a 20 -year, 24-hour storm <br />was 2.0 inches. The maximum expected discharge has been calculated based on the technique <br />presented in the SCS National Engineering Handbook, Section 4, "Hydrology." Soils information <br />used in calculating runoff was taken from a soils survey of the area done by the Soil Conservation <br />Service (SCS). <br />• o�s^ai+Reat 4 & n7L%rV Z AL -24 <br />