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10 -year, 24-hour storm to the retention ponds. The ditch will be reclaimed and the ground <br />surface reshaped to its approximate original contour. The plan calls for reseeding with an <br />irrigated pasture/poorly drained phase seed mix (generally similar to the pre -disturbance <br />swale/vegetation type). Finally, topsoil disking activities will overlap adjacent non -disturbed <br />native vegetation to hasten reinvasion of the native plants. <br />WATER RIGHTS <br />The surface water rights, namely, the shareholders of Colorado Cooperative Company 2nd Park <br />Lateral are listed in Appendix 2.04.7-2 of Section 2.04.7. The ground water rights (water wells) <br />adjacent to the New Horizon North mining area are listed in Table 2.04.7-4 of Section 2.04.7. <br />The water rights inventory boundary includes all water rights within a one mile radius of the <br />New Horizon North Mine. <br />ALTERNATIVE WATER SUPPLIES <br />ERMR has secured 27 shares of CCC 2nd Park Lateral water from the Garvey's during mining <br />with a coal mining surface lease. ERMR has an option to purchase land and 20 water shares from <br />the Meehan's, to be exercised upon DRMS's approval of the permit. Further alternative water <br />supplies are the 114.5 acre foot consumptive use credit of Colorado Cooperative Company <br />(CCC) water and the absolute storage right in NPDES Pond 001 (at the New Horizon 1 <br />reclaimed mine area of 4 acre-feet. No mitigation of any ground water impacts is anticipated. All <br />of the above water sources are considered as alternative water supplies that could be used as part <br />of NHN's augmentation plan for mitigating potential surface water rights impacts. It is estimated <br />that NHN, following augmentation usage, will still have available approximately 54 acre-feet of <br />excess consumptive use credit of (CCC) water. The alternative water sources will be selected <br />based on the pre -impact quantity and quality of the source to be mitigated. <br />PROTECTION AND MITIGATION PLAN <br />Introduction Only minor potential hydrologic impacts have been identified as having any <br />significance at the New Horizon North mining area. Surface water rights (flows) within the <br />influence of the pit inflow drawdowns will be protected and unabated by the diversion of the 2nd <br />Park Lateral ditch into a HDPE pipeline. The ditch water will be diverted around the mining area <br />until the pit has migrated far enough north to allow the pipeline to be rerouted to its approximate <br />original location. Rerouting the pipeline instead of putting the water back in a ditch prevents the <br />ditch water from being lost in the permeable backfill. A detailed augmentation and water rights <br />plan is presented in Appendix 2.05.6(3)-Ic and any potential impacts will be fully mitigated. In <br />addition to the mining practices designed to minimize disturbances to the hydrologic balance <br />previously discussed, comprehensive ground and surface water monitoring plans have been <br />Section 2.05.6(3)(b)(v) Page 4 December 2016 (RN -01) <br />