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Revised 11/15/81 <br /> A regional hydrologic study has been completed to assess the hydrologic <br /> impact of the area. This report is shown in Exhibit 6, Hydrology and <br /> Geology Information and has been developed by Water, Waste, and Land <br /> Limited. The sedimentation ponds and associated diversion ditches have <br /> been designed with regard to Section 4.05.6 and Section 4.05.9 of the <br /> Regulations for Coal Mining. In addition, the diversion structures have <br /> been designed utilizing the requirements of 4.05.3 and 4.05.4. Typical <br /> sections of the emergency spillways and embankments of each sediment <br /> control structure are shown in Figure 4. Figure 5 shows typical <br /> diversion ditch cross sections. Table 12 shows the dimensions of each <br /> constructed diversion structure located on the Sediment and Surface <br /> Water Control Plan Map (Map 13) . The design of each sediment control <br /> structure located on the Sediment and Surface Water Control Plan Map <br /> (Map 13) is. shown in Table 13, Sediment Control Structures Dimensions. <br /> Topsoil <br /> All topsoil material which is located in the area which will be <br /> disturbed by surface mining operations at the Maxwell Mine will be <br /> removed prior to disturbance in that area. CF&I Steel Corporation <br /> currently plans to disturb only additional area as required for <br /> placement of coal processing waste as shown on the Mine Plan Map (Map 3) <br /> during the term of the permit. Particular care will be taken to ensure <br /> that topsoil material is removed prior to the disturbance of the arL-a. <br /> The topsoil distribution which currently exists outside of the disturbed <br /> area at the Maxwell Mine is shown on the Soils Map (Map 14). In <br /> addition, depths of topsoil , subsoil , and other material are located on <br /> this Map. <br /> Soil material will be removed in preparation for expanding the coal <br /> processing waste or refuse disposal area. Table 14, Topsoil Mass <br /> Balance, shows the anticipated schedule of topsoil removal and <br /> replacement during the permit term. <br /> 2.05-14 <br />