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• 4.05 HYDROLOGIC BALANCE 4.05.1 General Requirements The underground mining activities at the Bear No. 3 Portals have been planned and will be conducted to minimize changes in the prevailing hydrologic balance, in both the permit and adjacent areas, and to prevent long-term, adverse changes in the balance that might result from the activities. As a preliminary step in minimizing adverse changes, hydrologic baseline information has been and is being collected, compiled, and analyzed. The origin of this data, along with a planned monitoring program, is outlined in Section 2.04.7. Information in this Section will provide detailed assessment of both the quality and quantity of surface water, drainage patterns, and geology. In addition, Section 2.05.6 details the specific technique which Bear Coal Company will implement to minimize • changes to the hydrologic balance. The post-mining land use as described in detail under Section 2.04.3 will be undeveloped land and limited residential use as defined in Section 1.04, Definitions. Although classified as undeveloped and residential land, the land will have the capability of providing shelter and feed for wildlife. Changes in the hydrologic balance will be minimized so that any post-mining land use will not be adversely affected. Water quality standards and effluent limitations at the existing mining operation and the proposed relocation of mining are regulated by the U.S. Environmental Protection Agency and the Colorado Department of Health under the terms of an NPDES Permit, and by the Coal Regulations of the Colorado Mined Land Reclamation Board. The applicable effluent limitations will be met by utilizing treatment methods which will include revegetation, minimizing disturbed areas, sediment retention, • mulch, and sedimentation ponds. Water quality control measures are discussed in detail under Sections 2.05.4 and 2.05.6. 4.05-1