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HYDROLOGY DESCRIPTION <br />The NHN permit area is adjacent to Elk Ridge Mining and Reclamation's active New Horizon 2 <br />Mine and incorporates part of the old Peabody Nucla Mine. Peabody performed detailed <br />hydrologic studies at the New Horizon 1 & 2 Mine areas (formerly called the Nucla and Nucla <br />East mine areas, respectively). Please refer to the original Peabody permit application: Volumes <br />B, C, D, E, F, and G for hydrology data related to old Nucla Mine (New Horizon 1 Mine area). <br />In the spring of 2008, Elk Ridge Mining personnel met with DRMS to discuss and agreed upon a <br />hydrologic monitoring program for the NHN permit area. The plan resulted in the drilling of 9 <br />hydrologic monitoring wells (GW -N47 through GW -N55) during the fall of 2008 and the <br />establishment of 19 surface water monitoring stations (SW -N200 through SW -N218) and <br />inclusion of two current New Horizon 2 Mine stations (SW -N1 and SW -N3) to supplement the <br />existing data that had been collected in the New Horizon 1 & 2 Mine areas. Of the nine ground <br />water monitoring wells, three (GW -N49, GW -N52, and GW -N55) were drilled and completed as <br />overburden monitoring wells, three were completed as coal zone monitoring wells (GW -N48, <br />GW -N51, and GW -N54) and three were completed as underburden monitoring wells (GW -N47, <br />GW -N50, and GW -N53). Map 2.04.7-1 shows the locations of the nine ground water monitoring <br />wells, and also shows the location of six ground water monitoring wells that were completed by <br />Peabody in (and adjacent to) the incorporated area of New Horizon 1 Mine area. Map 2.04.7-1 <br />also shows the locations of the 21 surface water monitoring sites (SW -NI, SW -N3 and SW200 - <br />SW218) as well as monitoring sites established by Peabody for the New Horizon 1 Mine area. <br />After permit approval and prior to disturbance, three (3) ground water monitoring wells were <br />installed in the southwestern portion of the NHN permit area. The locations of these 3 wells are <br />shown on Map 2.04.7-1. The three wells and the nine listed above make up NHN's groundwater <br />monitoring program. Ground water monitor well GW -N56 monitors the underburden (UB), well <br />GW -N57 monitors the coal zone and well GW -N58 monitors the overburden. GW -N56 was <br />completed on August 8, 2012 while GW's N57 and N58 were completed on August 9, 2012. The <br />completion diagrams for these three monitoring wells are shown on Figure 3 of Appendix 2.04.7- <br />1. All twelve wells will be monitored and reported in the Annual Hydrology Report. After review <br />of additional data and consultation with DRMS, ground water monitoring wells GW -N56, GW - <br />N57, and GW -N58 have been designated as points of compliance. <br />SITE SPECIFIC GROUND WATER INFORMATION AND BASELINE DATA <br />Regional and site specific geology and physiography pertinent to the description of ground water <br />resources in the NHN permit area are discussed in Section 2.04.5 and 2.04.6. Maps 2.04.5-1 <br />(General Geology and Hydrology Map), 2.04.6-4 and 2.04.6-5 (Geologic Cross Sections A —A' <br />and B -B') graphically illustrate the site specific geology at the NHN permit area. The permit area <br />is drained to the west and north by tributaries of Coal Canyon and to the south by tributaries of <br />Section 2.04.7 Page 1 December 2016 (RN -01) <br />