Laserfiche WebLink
<br />INTRODUCTION <br />Kerr Coal Company (Kerr) utilizes an extensive drainage and sediment <br />control method consisting of sedimentation ponds, diversion ditches and <br />culverts to control surface runoff within the Kerr permit area and limit <br />contributions of suspended solids to receiving drainages. Over the mine <br />life, Kerr will construct a total of 12 sedimentation ponds designated A <br />through L within the Kerr mine area. These ponds are located as shown on <br />the Mine Area Surface Water Hydrology Map, (Map 16a). Ponds A through G <br />currently exist and Ponds H through L will be constructed as required as <br />mining progresses to the north. All ponds are designed to retain the <br />runoff volume resulting from the 10-year, 24-hour storm event to allow <br />removal of sediment particles, and in addition, provide adequate capacity <br />to contain a design sediment volume. All diversion ditches and culverts <br />are also shown on the Mine Area Surface Water Hydrology Map, (Map 16a). <br />There have been two (2) methods used to determine runoff, peak discharge, <br />and sediment yield for the Kerr Mine. In the origins] permit (1980), the <br />"SCS Method" was used. Proposed ponds and associated structures have been <br />designed utilizing the "SEDCAD+" computer model. This Drainage and <br />Sediment Control Plan discusses both methods and summarizes the <br />methodology, assumptions, calculations, and results for the existing and <br />proposed structures separately. <br /> <br />The drainage and sediment control plan from the original permit (1980) for <br />the Kerr loadout area has been included in this Exhibit. This plan has <br />been approved and implemented for the Kerr loadout area. <br />23-1R Revised - August, 1990 <br />