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The pond has been designed to comply with the Board's requirements and provide <br />an additional margin of safety. Detailed data on the pond is listed in Tables 7 and 8. • <br />Work Area Sedimentation Pond <br />This pond illustrated on Figure I1 is constructed in an area adjacent to the work <br />area for providing sedimentation of the runoff from the working area. The working area is <br />the area occupied by the mine offices, maintenance facilities and yards, and storage <br />yards and buildings. <br />The pond was constructed at the beginning of mining activities and has been <br />serving its intended function for some time. The design was checked for compliance with <br />required regulations, and a principal pipe spillway and an emergency spillway were con- <br />structed in the summer of 1.980 in accordance with the recommendations to meet the <br />required regulations. Detailed data on the pond is listed in Tables 7 and 8. <br />Loadout Area Sedimentation Pond <br />This pond illustrated on Figure 12 is constructed in the loadout area for providing . <br />sedimentation of the runoff from the loadout area. The pond has been checked for com- <br />pliance with the Board's regulations and meets those requirements. In order to provide an <br />additional measure of safety, for insuring sufficient detention time, it is recommended that <br />an orifice plate with a 4" diameter orifice be attached to the 8" diameter principal spill- <br />way pipe. This will insure sufficient detention time in the event the pond is filled to the <br />elevation of the principal spillway at the time of a flood event and the valve on the 8" <br />pipe is fully open. Detailed data on the pond is listed in Tables 7 and 8. <br />CONCLUSION <br />The calculations made for the design and checking of the various features described <br />are attached as annexures to this exhibit. All features have been designed in accordance <br />with the Federal or State regulations applicable at the time of design. For those features <br /> <br />9 <br />