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r1 <br />U <br />Principal Spillway <br />Emergency Spillway <br />Spillway Data Summary <br />Sediment Pond 008 <br />Type . <br />Orifice Diameter . <br />Inlet Elevation <br />10-year, 24-hour <br />Peak Stage Elevation . <br />Riser Inlet (CNP) <br />6.00-inch <br />7011.4 <br />7013.8 <br />Type . <br />Barrel Diameter. . <br />Riser Diameter . <br />Length of Barrel . <br />Vertical Head Drop . <br />Entrance Loss Coef . <br />Bend Loss Coef . <br />4!ier Coef <br />Orifice Coef . <br />Manning Coef . <br />Inlet Elevation <br />25-year, 24-hour <br />Peak Stage Elevation . <br />Drop Inlet (CMP) <br />24.000-inch <br />24.000-inch <br />120.000-ft <br />16.2 -ft <br />1.000 <br />0.500 <br />3.100 <br />0.600 <br />0.025 <br />7015.0 <br />7016.7 <br />The entrance to the emergency spillway is located 3.6 feet above the <br />• principal spillway. There will be no flow through the emergency spillway <br />inlet as a result of the runoff from a 10-year, 24-hour precipitation <br />event or less. See Figure 1 for explanation of above. <br />TABLE 3 <br />Pond 008 is designed to safely pass the runoff from the 100-year, 24-hour <br />precipitation eveni without overtopping the dam. The top of the dam <br />elevation (7019.1) is 1.7 feet above the peak stage elevation of 7017.4. <br />CONSTRUCTION PLAN <br />• <br />Site Work Prior to Embankment Construction <br />The embankment construction area was dewatered as much as practicable to <br />allow heavy equipment to operate in the area. To accomplish this, a <br />dewatering trench or trenches was excavated with a small backhoe. A pump <br />was set in the trench to lower the local water table. Peabody received a <br />Construction Dewatering Wastewater Discharge Permit from the Colorado <br />Department of Health. This permit allowed Peabody to discharge this water <br />away from the construction activities while maintaining water quality. <br />6 <br />