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Temporary vegetative cover will be established on stockpiles as soon as possible when they become temporarily inactive. Stockpiles will be considered inactive when they are to be left undisturbed for a period of l2 or more consecutive months. When temporary revegetation is required, stockpiles will be seeded during the next normal planting periods (i.e., during the fall or early spring). The stabilization seed mixture to be used for establishing vegetation cover on stockpiles is provided in Table 6. This seed mixture will be applied at a relatively high seeding rate (approximately 17.5 bulk pounds per acre) to provide effective erosion and sedimentation control. 4.4 ROADS Roads represent a significant portion of the area [o be disturbed by American Soda over the life of the Yankee Gulch Project. Erosion and sediment controls will be implemented during construction, operation and reclamation phases to ensure that adverse environmental impacts associated with roads are minimized. Erosion and sediment controls and methods to be used during road construction, use and reclamation are detailed below. In the construction phase silt fences (Figure I ), straw bale filters and check dams (Figure 2 and Figure 3), geotextile fabrics (Figure a), and temporary drain structures (Figure 5) will be used to control erosion and sedimentation. To minimize sedimentation and control erosion, low water crossings with culverts sized to pass base flow conditions and adequate surfacing materials will be used where permanent roads are located across intermittent or perennial streams (Figure 6). Additionally, perennial stream crossings will allo~•r adequate freeboard for inlet head to allow all weather use of roads. Ephemeral stream low water crossings may use durable surfacing materials with or without culvert installation as approved by the BLM. To ensure uninterrupted use during the operational phase, roads will be designed and constructed to meet all applicable BLM specifications and standards. To promote safety, facilitate the smooth flow of traffic, reduce road and equipment maintenance costs, and promote structural stability, roads will be constructed with: • Road surfaces above the adjacent ground surface, to the extent that this is physically possible and reasonably accomplished: • Adequate crowning or sloping to ensure positive drainage From the traveled surface; and Erosion and sediment control structures and practices sufficicn[ to safely convey surface water runoff away from the road. Typical road layouts include embankment, side hill, cut slope and gentle slope topography drainage situations (Figure 7). During a road's operational life, maintenance activities will be performed to ensure that proper surface configurations are maintained. Surfacing will be of adequate thickness and durable materials capable of supporting the types and amounts of traffic expected to use the road during its use period. Surfacing materials will also minimize or prevent erosion and sedimentation from the road's surface. Drainage systems that are capable of safely carrying runoff from roads into undisturbed drainage channels will be provided. Road drainage systems will typically include the use of ditches, berms, diversions and channels of various configurations and sizes (Figure 8); drop structures (Figure 5); water bars (Figure 9); and culverts (Figure 10) with outlet protection as needed (Figure I l) to achieve positive drainage and protect the integrity of the roadbed. When Amencan Sala. L.L.P. 4-5 Soil Conxrvation. Fiosion and Sedirnent Control. Rttlamation, and Rcvegetation Plan nctober 28. 1998 Neviud Apn19, 1999