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• Roaring Fork River. Sediment accumulating in Pond 2 will be cleaned <br />out annually. Disposal of the sediment will be in the refuse pile at <br />the mine. <br />Truck Dump <br />Sediment from the truck dump area will be controlled in a sedimen- <br />tation pond constructed in the northwest portion of the truck turn- <br />around paved area which is 0.9 acres in size. The sedimentation pond <br />has a quarter-circle shape with a 130-foot radius at the top. This <br />paved area ponding will provide a total detention capacity of 0.11 <br />acre-feet with 10 percent dedicated to sediment volume. The emergency <br />spillway will be a trapezoidal shaped earth structure with 2:1 side <br />slopes, and was designed to pass a 25-year, 24-hour precipitation <br />event, <br />~ Haul Road <br />• Sediment is controlled along the haul road by minimizing the area of <br />disturbance and constructing the road to a minimum grade in order to <br />prevent erosive velocities of runoff from developing, Much of the <br />haul road is situated on an existing road which was upgraded to carry <br />the additional traffic. Utilizing much of the existing road has mini- <br />mized the area of disturbance. Stretches of the road which required <br />new construction will have sediment control measures implemented, such <br />as hydromulcing and reseeding. <br />The average grade of the road from the point at which it leaves the <br />existing county road to the truck dump location is approximately 3 <br />percent. The maximum grade of the road is approximately 8 percent. <br />This occurs where the haul road swings eastward from the existing road <br />and crosses farmland. The maximum grade exists for less than 300 <br />r <br />4-137 <br />