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• The truck dump will require construction of a ramp so that the <br />truck can dump the rock into the crusher hopper. The ramp will be 20 <br />feet in width, sloped at 3h:10 with side slopes at 2h:ly. Construction <br />of the ramp will require approximately 370 yd3 of fill. This material <br />will be obtained from the site or imported. <br />The retaining wall will be constructed of wood planking, wood <br />support posts, and deadmen. The retaining wall will be 32 feet in <br />length and have wing walls (16 feet in length) coming off of both ends. <br />Figure IV-l0a demonstrates the configuration of the structure. Prior to <br />constructing the retaining wall and wing walls, the existing metal <br />structure will be removed and scrapped. <br />• The construction of the retaining and wing walls encompasses <br />setting the support posts, securing the wooden planks to the post, and <br />attaching the deadmen to the posts. The area behind the retaining and <br />wing walls will be filled with approximately 150 yd3 of material to <br />secure the deadmen and provide a base for the truck ramp. The wing <br />walls will be tied into the existing slope, thus providing an additional <br />measure of stability to the retaining wall. <br />The lower bench will house the crusher and screening plant and <br />product stockpiles. Prior to setting up the crusher and screening <br />plant, approximately six (6) inches of plant growth media will be <br />removed from the area. The volume of plant growth media to be salvaged <br />was determined after a site visit. As stated previously, the area was <br />• disturbed prior to construction of the crusher. At the time of initial <br />(REV. 12/13/83) <br />IV-44b <br />