2014-05-12_PERMIT FILE - C2010089A (3)

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Surface Water Monitoring WFC will continue to collect data from the baseline surface water monitoring sites (SW -N200 through SW -N209, minus SW -N206, destroyed by County maintenance) for the foreseeable future, (see Section 2.04.7 and Appendix 2.04.7 -2). It is anticipated that some of the sites may be relocated (with DRMS consultation) as mining advances and that other sites may be added as circumstances require. As an example, the two sites monitoring the 2nd Park Lateral inflow and out flow, SW -N209 and SW -N200 respectively, will be affected when the irrigation water is diverted through the HDPE pipeline. Irrigation water will be reintroduced in the Garvey parcel during the reclamation phase of the NHN Mine. This will be a sprinkling type of system in contrast to the current "flood" system. Additionally, prior to mining, the NHN permit area will be managed to prevent irrigation water from entering the permit area. Upstream irrigation runoff flow in Glasier, Meehan, and Nygren Draws will not be affected by mining as they will be protected by "stream buffer zones ". Surface water monitoring site SW -N205 will be affected in that the irrigation water will be shut off indefinitely. The surface water monitoring will be maintained for the life of the mining operation or until such a time as DRMS may agree that they are no longer necessary. Surface water monitoring installations, if any, will be removed upon completion of the post mining phase of the Hydrologic Monitoring Program. All surface water data collected at each monitoring site in each future water year will be compiled and submitted to DRMS in the form of the New Horizon Annual Hydrology Report (AHR) within three months after the end of each water year. Future AHRs will include copies of quarterly NPDES discharge monitoring reports for each NPDES monitoring site submitted to the Colorado Department of Health during the same water year. Stream Buffer Zones The stream buffer zones along Nygren Draw, Meehan Draw, and Glasier Draw (land within 100 feet of a perennial stream or stream with a biological community as defined by Section 4.05.18(3) of DRMS regulations) will protect the streams from adjacent disturbance activities within the New Horizon North area, (see Map 2.04.7 -1, Section 2.04.7). The stream buffer zones will be managed by "best practices" to prevent any entrance into or disturbance of the stream buffer zones which will include (but not be limited to) diversion ditches, berms, silt fences and "buffer zone" identification. Pit perimeter roads (haul roads and access) will cross Meehan Draw on both the east and west ends of the draw and adjacent to the right -of —ways of 26 '/z Road and 26 Road and will cross Glasier Draw on the west end of the draw and adjacent to 26 Road. WFC will obtain Corps of Engineers 404 permits for these crossing that will be constructed by extending the existing culverts under the roads at stream grade and then adding fill above the culverts. The effect will be similar to widening the roads at the crossing points. Section 2.05.6(3) Page 7 October 2013 (TR -05) E: \New Horizon \DRMS \NHN Permit \04_Techmcal Revisions TR \TR -05 \Documents from Jason \2.05.6(3) Protection of Hydrologic Balance_TR- OS.doc