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r 1 <br />LJ <br />U <br />24-hour event). The annual sediment yield was calculated with the Universal Soil Loss <br />Equation (Haan & Barfield, 1978) .The pond is designed to store two years of sediment <br />below the volume of the 10- year, 24-hour event. Sediment from the pond will be <br />cleaned when 60 percent of the allocated volume has accumulated. A staff gauge, <br />located in the pond, will be used to monitor sediment accumulation. The 25-year, 24- <br />hourcapacity spillway will be located one foot above the design runoff and sediment <br />volume. <br />The primary spillway is a 4" cast iron pipe. Design features of Pond A are summarized <br />in the table below. As-constructed details of Pond A and associated facilities are shown <br />in Figure 4.3-ti. <br />Table 4.3-6. Summary of Sediment Pond A <br />Actual Capacity <br />Required Capacity (Appendix 4.7-2) <br />Stage Height to Contain 1.2 A-F <br />The Operator intends to have a third party drill two or three coal bed methane test wells <br />west of the Coal Ridge No. 1 Mine. These test wells will produce some water which will <br />be piped to the Coal Ridge No. 1 Mine sediment pond during 2007. The pipe will be laid <br />on the surface so no significant surface disturbance will occur. The water will be left in <br />the pond to evaporate. The field below the pond will be irrigated with the water if the <br />quality is suitable. At lease 1.2 feet of freeboard will be maintained to assure no <br />uncontrolled discharge occurs from the pond <br />7.2 A-F <br />1.2 A-F <br />1.2 FT <br />The maximum <br />CB-Coal Ridge No. 1 <br />4-39 <br />rV~/Q- Z 4 4/07 <br />