2015-08-31_PERMIT FILE - C1981010A (16)

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Doc Date:1211112001999 III I II I II I II IIII III • 2/4� YDROLOGIC IMPACTS This section discusses the predicted impacts and mitigation of the surface and ground waters from the Trapper Mine, changes in the post -mine hydrologic balance, probable impacts to the potential alluvial valley floors, and operational monitoring. 4.8.1 Surface Water Section 2.7.4 discusses the pre -mine conditions of the surface water near the Trapper Mine, while this section discusses the surface water impacts and mitigation of those impacts. The use of surface water at Trapper Mine will be presented first and followed by a discussion of the surface drainage during and after mining. Finally, data which were collected from the operational surface water quality mondori g is presented, with a discussion of the surface water quality after mining. This data includes the information obtained during the initial permit term of 1981-1987. Data from 1988 through the present are included in Appendix W (annual reports), Section 2. • It should be noted that this application reflects the maximum expected level of production at Trapper Mine during the proposed permit period. A lesser production rate during parts or all of the permit period will result in a slower progression of disturbance. The drainage and sediment control plan presented in this application covers all affected lands at Trapper through the proposed permit term. All structures, however, are planned for maximum disturbance through the life of the mine. 4.8.1.1 Use of Surface Water Applications to the District a Water Court, Steamboat Springs, have been filed to use surface water in the settling reservoirs for dust suppression, livestock and wildlife. A copy of this application is included in Appendix Q. This is the only use of surface water at Trapper Mine.