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• The location of the proposed sedimentation pond and diversion structures to be <br />constructed within the facilities area are shown on the Facilities btap (Map 5). <br />Generally, the pond and spillways were sized and placed according to such hydrological <br />factors as required sediment storage volume, rate of flow, and volume of flow for ]0- <br />year, 24-hour and 25-year, 24-hour events. The pond and spillway have been designed to <br />maintain structural integrity and stability, adequacy in height, size and shape to provide <br />sufficient volume for sediment and water for functional use during the life of the <br />operations. The pond has been designed under the direction of a qualified, registered, <br />professional engineer. Specific calculations are shown in Exhibit 9, Drainage and <br />Sediment Control Plan Calculations. <br />The purpose of the sedimentation pond is not only to provide a final measure to prevent <br />additional contributions of sediment outside the facilities area, but also to provide a <br />means of compliance with all applicable effluent limitations of the Colorado Department <br />of Health, Water Pollution Control Division, especially with respect to total suspended <br />solids. <br />The location of the dugout pond and diversion structures within the facilities area is <br />shown on the Facilities Map (Map 5). The purpose of the dugout pond is to control any <br />erosion from Topsoil Pile #1 from leaving the permit boundary untreated. However <br />Topsoil pile #1 is fully vegetated and little or no erosion occurs. The dugpond has been <br />• designed under the direction of a qualified, registered, professional engineer. Specific <br />calculations are shown in Exhibit 9, Drainage and Sediment Control. <br />The effluent quality will be regulated by the National Pollutant Discharge Elimination <br />System (NPDES) Permit. The NPDES Permit is issued by the State of Colorado <br />Department of Health under the National Pollutant Discharge Elimination System <br />established as a result of the Clean Water Act (33 U.S.C. Section 1251, et sea . TCC is <br />operating under an approved NPDES permit. <br />Topsoil <br />Prior to construction of the loadout facility, topsoil will be, removed from the site to be <br />disturbed and stockpiled for use in future reclamation of the area. The topsoil will be <br />removed by scrapers and/or dozers. <br />Approximately 12 inches of topsoil will be removed from the areas to be affected by the <br />loadout construction and approximately eight inches of <br /> <br />2.05-4R <br />Rev. 6- l 5-93 <br />Permit Renewal 3 <br />/>l R-I "~ <br />