2009-10-20_PERMIT FILE - C1980004A (2)

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2-39 • 2.3.3 Topsoil Handling Topsoil will be stockpiled in the vicinity of the disturbed area through placement by the equipment utilized for removal. Placement will be in 12-inch lifts if the volume of material warrants. Additional machinery such as dozers will be utilized in the stockpile area in order to achieve the design configuration discussed in Section 2.3.4. 2.3.4 Topsoil Stockpile Design and Management Topsoil will be stockpiled separately at the location shown in Figure 2.2-2. In 2008 or 2009, a new topsoil stockpile will be created in the sagebrush flats south of the office area and McClave Creek. Topsoil will be stripped from the new disturbed areas and placed in the pile. The material from the existing stockpile will be moved to the new pile. The base area of the topsoil stockpile is planned for approximately 22,000 square feet. The stockpile will have a maximum vertical height of 30 feet and 2.5 horizontal to 1 vertical side slopes will be utilized. The topsoil stockpile has been sited in consideration of potential surface water run-off originating from precipitation events, and potential disturbance from normal operations. A sedimentation control ditch will be constructed around the perimeter of the topsoil stockpile. This ditch will be of such a size to allow for cleaning as required. Sediment removed from the ditch will be placed back on the stockpile. A sediment control berm will be constructed around the perimeter of the pile in order to direct runoff to the sedimentation control ditch and ultimately the sediment pond. The stockpile will be top graded to prevent concentrated water flow. During storage, the topsoil stockpile will be stabilized with the temporary revegetation mixture as shown in Table 3.4-2. The topsoil stockpile will be sprayed with round up as necessary to control cheatgrass establishment. C TR-16 M`-Volume 1 (Ftev 05/08)