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~~- 4.0 <br />• .:-' .. PAD EZTEHSIOH DESIGN <br />4.1 Pad construction <br />- The pads will be constructed as follows: <br />.- 1. The topsoil will be removed from the area to be covered by the <br />_ _ <br />-~ - --- extended pad, and stockpiled for future use. <br />2. The waste rock will be end-dumped in a single lift. This will <br /> result in the largest sized material migrating to the base of <br /> the pile, creating a higher permeability material at the toe, <br /> to act as a drain in the unlikely event that the pad materials <br /> were to approach saturation. This proposed approach is <br /> considered to be allowable in this situation as the material <br /> being placed is development rock, essentially free of <br /> combustible material, and the disposal is above the water• <br /> table. In the event that this is proposed approach causes <br /> concern, NCEC are prepared to compact the fill in 24" lifts as <br /> per Section 4.10.4(3)(b). <br />---••-•- 3. Following placement in this manner, the material will be <br />==- = -•- -= - periodically push-dozed to the required 2h: lv slope, by moving <br />-- --_-- material from the crest downhill. <br />'--'•---~• .4: <br />~~ <br />~ <br />- <br />~ On completion of the tunnel excavation, the front face of the <br />==~ <br />~ <br />~ <br />_ pad will be smoothed, a 16 inch thick topsoil layer applied to <br /> the face, and the face revegetated in accordance with the site <br /> reclamation plan. This reclaimed surface will meet all <br />=~- requirements for a permanently reclaimed slope, and will <br /> resist ingress of water and oxygen, and prevent any <br /> possibility of combustion. The 16 inch cover depth is <br /> optimal: deep enough to provide an excellent growing medium, <br /> and shallow enough to prevent erosion because of the rock <br />- -=--- materials that aze immediately beneath the cover. <br />5. On completion of the project, the upper pad surface will be <br /> reclaimed, by filling to approximate original contours wi}~h I <br /> available waste rock materials, topsoiling, and revegetating. <br />The specific plan for each pad is discussed below. <br />4.2 ~~ Portal uad <br />Portal #1 pad will be extended to the north, with the face slope <br />being flattened from the current 35° to the required 2h:1v (26.5°). <br />The plan of the extension is presented on Figure 2, toge`~her with "` <br />a cross section through the. thickest portion of the pad. <br />The volume of material that would be required to achieve the <br />Adrian Brown Consultants -7- 1145/900531 <br />