2018-07-02_PERMIT FILE - C2010089 (16)

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NHN mining area are listed in Table 2.04.7-4. The water rights inventory boundary includes all water rights within a one mile radius of the NHN Mine. ALTERNATIVE WATER SUPPLIES ERMR has secured 27 shares of CCC 2nd Park Lateral water from the Garvey's during mining with a coal mining surface lease. ERMR has an option to purchase land and 20 water shares from the Meehans, to be exercised upon DRMS's approval of the permit. Further alternative water supplies are the 114.5 acre foot consumptive use credit of Colorado Cooperative Company (CCC) water and the absolute storage right in NPDES Pond 001 at the New Horizon 1 reclaimed mine area of 4 acre-feet. No mitigation of any ground water impacts is anticipated. All of the above water sources are considered as alternative water supplies that could be used as part of NHN's augmentation plan for mitigating potential surface water rights impacts. It is estimated that NHN, following augmentation usage, will still have available approximately 54 acre-feet of excess consumptive use credit of (CCC) water. The alternative water sources will be selected based on the pre -impact quantity and quality of the source to be mitigated. PROTECTION AND MITIGATION PLAN Introduction Only minor potential hydrologic impacts have been identified as having any significance at the NHN mining area. Surface water rights (flows) within the influence of the pit inflow drawdowns will be protected and unabated by the diversion of the 2nd Park Lateral ditch into a HDPE pipeline. The ditch water will be diverted around the mining area until the pit has migrated far enough north to allow the pipeline to be rerouted to its approximate original location. Rerouting the pipeline instead of putting the water back in a ditch prevents the ditch water from being lost in the permeable backfill. A detailed augmentation and water rights plan is presented in Appendix 2.05.6(3) -lc and any potential impacts will be fully mitigated. In addition to the mining practices designed to minimize disturbances to the hydrologic balance previously discussed, comprehensive ground and surface water monitoring plans have been developed to assess the possible impacts to the hydrologic system. The results of the monitoring programs have and will continue to be employed to detect changes to the hydrologic balance and if detected significant changes can then be mitigated by changes to the operations. The approved monitoring program is described in Section 2.04.7, Hydrology Description. This program will continue for the foreseeable future until amended with approval of DRMS. Groundwater Monitoring Plan Ground Water Quality Monitoring data on ground water quality will be compared against the multiple year baseline monitoring ranges established for each chemical parameter monitored at Section 2.05.6(3)(b)(v) Page 4 March 2018 (TR -16)