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<br />IV.1 Grading Plan <br />Because of the nature of the terrain, a significant amount of grading work was required at the D <br />Portal Area to provide a flat area for buildings, workspace and parking lots. Grading requirements <br />for conveyors, the East Portal Area, and the Refuse Disposal Area were minimal. The 8 Seam <br />ventilation shaft site required a minimum amount of cutting into the valley slope to provide a firm <br />foundation for the shaft above the Scullion Gulch alluvial/colluvial deposits. Maps 151 and 152 <br />show the site grading plan for the 8 Seam ventilation shaft facility. <br />The first construction work was the portion of the haul road and plant access road between the <br />existing county road and the D Portal Area to provide access to that area. Grading for the facilities <br />in the D Portal Area then followed. Upon completion of this work, the grading for the rest of the haul <br />road was accomplished. No major grading was required in the disposal area. <br />During the first six months of construction, approximately 1 acre of ground was used as a temporary <br />construction trailer and parking site. This area was located near the junction of County Road 65 and <br />the haul road. Topsoil was stripped from this area, stockpiled, mulched and reseeded to minimize <br />erosion. The area was surfaced with approximately 4 inches of gravel. A cut off ditch above the <br />trailer and parking site and gravel surfacing was provided in lieu of a sediment pond since the area <br />• was small and only used for a short time. At the end of the first summer of construction, the <br />construction trailers were moved to the D Portal Area and the area reclaimed. The gravel surfacing <br />was removed, the site regraded and the topsoil redistributed. The topsoil was mulched and <br />reseeded in accordance with the Revegetation Plan approved at that time. <br />Prior to commencing grading work, trees and brush were cleared and available topsoil stripped and <br />sorted for future reclamation. Topsoil thickness, locations, and quantities, are shown on Map 28 for <br />the D Portal Area. No topsoil was stripped at the Ventilation Entry Area as most of the surface soils <br />are intermingled with mine spoil and coal from the previously existing Staley Gordon Mine. <br />All fill slopes are 2h:1v except for the East Portal Area. This slope was used because the cut <br />material available was mostly rock fragments mixed with enough soil-type material to achieve 90 <br />percent of maximum compaction. The East Portal pad was constructed by using a fill slope of <br />1.5h:1v to avoid disturbing the Scullion Gulch Drainage channel. Fill material for these slopes <br />consisted of rock fragments that are stable at this slope, The ground was plowed, stepped, or, <br />when in rock, keyed as required to increase the stability of the fill. The East Portal area was also <br />widened and expanded for storage as well as improved access (see Map 139). The East Portal <br />Area fill work in July 1989 was built at a slope of 2h:1v and did not disturb the Scullion Gulch <br />drainage channel. All fills were constructed in compliance with Rule 4.09.1. Fills in the disposal <br />• Permit Rev. 4 (11/2002) IV-33 <br />