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Diversions have been designed to pass the 10 -year, 24-hour runoff volumes in accordance with <br />approved engineering design criteria. Culverts and road drainageways will insure that runoff <br />originating within or outside each mining area will be controlled and adequately routed through to <br />minimize changes in surface water quantities. <br />The postmining landscape is designed to protect the hydrologic balance by establishing slopes that <br />generally will not exceed 5:1. Any highwall reductions will result in maximum slopes not to exceed <br />5:1. Reclaimed hillslopes proposed for the New Horizon 2 mining area approximate the original <br />premining contours. <br />Topsoil material will exhibit infiltration rates generally similar to premining soils. At the New <br />Horizon Mine, future reclaimed areas will be manipulated mechanically using chisel plowing and <br />ripping of graded and topsoiled areas in combination with timely reseeding to minimize overland <br />flow rates and volumes. <br />Surface Water Monitoring <br />WFC will continue to collect data from the currently approved monitoring sites. See Section 2.04.7. <br />The current Surface Water Monitoring Plan employed to monitor the extent and magnitude of any <br />mining impacts is discussed in Section 2.04.7.1 Hydrology Description. <br />The surface water monitor will be maintained for the life of the mining operation or until such a time <br />as DRMS may agree that they are no longer necessary. The surface water monitoring installation <br />will be removed upon completion of the postmining phase of the Hydrologic Monitoring Program. <br />All surface water data collected at each monitoring site in each future water year will be compiled <br />and submitted to the DRMS in the form of the New Horizon Annual Hydrology Report (AHR) <br />within three months after the end of each water year. Future AHRs will include copies of quarterly <br />NPDES discharge monitoring reports for each NPDES monitoring site submitted to the <br />Colorado Department of Health during the same water year. <br />Water Rights and Alternative Water Supplies <br />Introciucti cn <br />A new inventory of water rights around both New Horizon mine sites was made in 2001. Ground <br />water rights within the immediate region (2 mile radius) around the New Horizon Mine are <br />presented in the Appendix to Section 2.04.7-1. In all, 29 ground water rights have been identified <br />in the vicinity of the New Horizon 1 and New Horizon 2 mining areas. All monitoring wells <br />installed by the permittee and domestic wells within the surrounding area are shown on Map <br />July 2016 (TR -74) 2.05.6(3)-6 <br />