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HYDROLOGY DESCRIPTION <br />The New Horizon North (NHN) permit area is shown on Map 2.04.7-1, Hydrology Monitoring <br />Site Locations, contained in the appendix of this section of the application. The NHN permit area <br />is adjacent to WFC's active New Horizon Mine and incorporates part of the old Peabody Nucla <br />Mine. Peabody performed detailed hydrologic studies at the New Horizon 1 & 2 mine areas <br />(formerly called the Nucla and Nucla East mine areas, respectively). WFC continues to conduct <br />water level and water quality monitoring at the New Horizon Mine. WFC refers the reader to the <br />original Peabody permit application: Volumes B, C, D, E, F, and G for hydrology data related to <br />old Nucla Mine (New Horizon 1 Mine area). During the spring of 2008, WFC met with DRMS <br />personnel to discuss and agree upon a hydrologic monitoring program for the N14N permit area. <br />The resulting plan resulted in the drilling of 9 hydrologic monitoring wells (GW -N47 through GW - <br />N55) during the fall of 2008 and the establishment of 15 new surface water monitoring stations <br />(SW -N200 through SW -N214) and two current New Horizon Mine stations (SW -N1 and SW -N3) <br />to supplement the existing data that had been collected in the area at the New Horizon Mine 2 area <br />and in the New Horizon Mine 1 area. Five additional surface water monitoring sites (SW210 — <br />SW214) were later added. Of the nine ground water monitoring wells, three (GW -N49, GW -N52, <br />and GW -N55) were drilled and completed as overburden monitoring wells, three were completed <br />as coal zone monitoring wells (GW -N48, GW -N51, and GW -N54) and three were completed as <br />underburden monitoring wells (GW -N47, GW -N50, and GW -N53. Map 2.04.7-1 shows the <br />locations of the nine new ground water monitoring wells. Map 2.04.7-1 also shows the location <br />of six ground water monitoring wells that were completed by Peabody in (and adjacent to) the <br />incorporated area of New Horizon 1 Mine area. Map 2.04.7-1 also shows the locations of the 17 <br />new surface water monitoring sites (SW -N1, SW -N-3 and SW200 - SW214) as well as monitoring <br />sites established by Peabody for the New Horizon 1 Mine area. <br />After permit approval and prior to new disturbance, three (3) new ground water monitoring wells <br />were installed in the southwestern portion of the NHN permit area. The locations of these 3 new <br />wells are shown on Map 2.04.7-1. New ground water monitor well GW -N56 will monitor the <br />underburden (UB), well GW -N57 will monitor the coal zone (Coal) and well GW -N58 will <br />monitor the overburden. GW -N56 was completed on August 8, 2012 while GW's N57 and N58 <br />were completed on August 9, 2012. The completion diagrams for the three new monitor wells <br />are shown on Figure 3 of Appendix 2.04.7-1. These wells will be monitored and reported on the <br />same cycle as the other ground water monitoring wells. It is anticipated that these wells will <br />become the points of compliance after review of additional data and consultation with DRMS. <br />SITE SPECIFIC GROUND WATER INFORMATION AND BASELINE DATA <br />Introduction Regional and site specific geology and physiography pertinent to the description of <br />ground water resources in the NHN Mine permit area are discussed in Section 2.04.5 and 2.04.6. <br />Section 2.04.7 Page 1 Sept. 2015 (TR -11) <br />