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~ • Construction and utilization of the support facilities will not result in damage or disruption of any oil or gas
<br />production or transmission facilities. Likewise, no utility lines for water, sewage, electrical or telephone services will
<br />be affected by the facilities. The only utilities in the area of the mining operation will be constructed for the specific
<br />it purpose of providing services to those operations. Upon completion of all mining and related activities, it is
<br />anticipated that those utilities serving the mine site will either be stubbed off or removed.
<br />4.05 HYDROLO(',I(' RAi. NCF
<br />4.05.1 G . .RA RQ[_1TR_F.MENTS
<br />All ongoing and planned underground mining and associated operations at CEC will be conducted to minimize
<br />changes in the prevailing hydrologic balance in both the permit and adjacent areas, and to prevent long-term adverse
<br />changes in water quality and quantity which might result from the operations.
<br />As a preliminary step in minimizing adverse changes, hydrologic baseline information has been and is being
<br />collected, compiled, and analyzed. The hydrologic information is outlined in Section 2.04.7, Hydrology Information.
<br />This data provides detailed information on quality and quantity of surface water, ground water, drainage patterns, and
<br />geology. In addition, Section 2.05, Minimum Requirements for Operation and Reclamation Plans, details the specific
<br />mining and reclamation techniques which CEC has and will implement to minimize changes to the hydrologic
<br />balance. The post-mining land use is described in Section 2.05.5, Post-Mining Land Uses. Changes in the
<br />hydrologic balance will be minimized so that post-mining land uses will not be adversely affected.
<br />Water quality standazds and effluent limitations at the mining operation are regulated by the U.S. Environmental
<br />Protection Agency and the Colorado Department of Health, Water Pollution Control Division, under the terms of an
<br />• NPDES permit, see Exhibit 2, Other Required Permits, and by the Coal Regulations of the Colorado Mined Land
<br />Reclamation 13oard. The applicable effluent limitations will be met by using treatment methods which include
<br />prompt revegetation, minimizing disturbed areas, sediment retention, use of contour furrows, mulching, sediment
<br />ponds, and if necessary, strategically placed energy dissipaters, such as riprap, check-dams, mulches, filters, and
<br />dugouts. Water quality control measures are discussed in detail under Sections 2.05.3, 2.05.4, and 2.05.6 of this
<br />application.
<br />Where practical, diversion methods have been used to channel the flow of water from undisturbed areas so as to by-
<br />pass the disturbed area rather than using the drainage and sediment control system. The principal techniques to be
<br />used for this purpose will be diversion ditches. The locations of these diversion ditches are shown on the Drainage
<br />and Sediment Control Plan Map (Map 26) and are discussed in detail under Section 2.05.3, Operation Plan -Permit
<br />Area. The specific diversion ditch designs are presented in Exhibit 18, Drainage and Sediment Control Plan.
<br />As discussed in Section 2.05.4, Reclamation Plan, CEC will use a cover crop mulch on the topsoil after its
<br />redistribution as one (1) method to prevent excessive wind or water erosion.
<br />CEC plans to have surface runoff from the disturbed areas pass through sedimentation ponds. Sedimentation ponds
<br />are discussed in detail under Sections 2.05.3 and 2.05.6, and their locations are shown graphically on the Drainage
<br />and Sediment Control Map (Map 26). The detailed designs for all sedimentation ponds are presented in Exhibit 18,
<br />Drainage and Sediment Control Plan.
<br />In addition to the mining, reclamation, and treatment methods described and referenced in this section, further
<br />protection of the hydrologic balance will be established by an ongoing plan for monitoring any changes in surface
<br />water quality and quantity. This monitoring plan is described under Section 2.05.6, Mitigation of the Impacts of
<br />Mining Operations, and monitoring locations are graphically shown on the Hydrologic Monitoring Program Location
<br />Map (Map 1 1).
<br />Permit Renewal No. 3 4.01-3 7/15/98
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