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SECTION 2.04.7 <br />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 this permit application. The NHN <br />permit area is adjacent to WFC's active New Horizon Mine and incorporates part of the old <br />Peabody Nucla Mine. Peabody performed detailed hydrologic studies at the New Horizon 1 & 2 <br />mine areas (formerly called the Nucla and Nucla East mine areas respectively). WFC continues <br />to conduct water level and water quality monitoring at the New Horizon Mine. WFC refers the <br />reader to the original Peabody permit application: Volumes B, C, D, E, F, and G for hydrology <br />data related to old Nucla Mine (New Horizon 1 Mine area). During the Spring of 2008, WFC <br />met with DRMS personnel to discuss and agree upon a hydrologic monitoring program for the <br />NHN permit area. The resulting plan resulted in the drilling of 9 hydrologic monitoring holes <br />(GW -N47 through GW -N55) during the fall of 2008 and the establishment of 15 new surface <br />water monitoring stations (SW -N200 through SW -N214) and two current New Horizon Mine <br />stations (SW -N1 and SW -N3) to supplement the existing data that had been collected in the area <br />at the New Horizon Mine 2 area and in the New Horizon Mine 1 area. Five additional surface <br />water monitoring sites (SW210 — SW214) were later added. Of the nine ground water monitoring <br />holes, three (GW -N49, GW -N52, and GW -N55) were drilled and completed as overburden <br />monitoring holes, three were completed as coal zone monitoring holes (GW -N48, GW -N51, and <br />GW -N54) and three were completed as under- burden monitoring holes (GW -N47, GW -N50, and <br />GW -N53. Map 2.04.7 -1 shows the locations of the nine new ground water monitoring holes. <br />Map 2.04.7 -1 also shows the location of six ground water monitoring holes that were completed <br />by Peabody in (and adjacent to) the incorporated area of New Horizon 1 Mine area. Map 2.04.7- <br />1 also shows the locations of the 17 new surface water monitoring sites (SW -N1, SW -N -3 and <br />SW200 - SW214) as well as monitoring sites established by Peabody for the New Horizon 1 <br />Mine area. <br />SITE SPECIFIC GROUND WATER INFORMATION AND BASELINE DATA <br />Introduction Regional and site specific geology and physiography pertinent to the description <br />of ground water resources in the NHN Mine permit area are discussed in Section 2.04.5 and <br />2.04.6. Maps 2.04.5 -1 (General Geology and Hydrology Map), 2.04.6 -4 and 2.04.6 -5 (Geologic <br />Cross Sections A —A' and B -B') graphically illustrate the site specific geology at the NHN area. <br />New ground water monitoring holes GW -N47 through GW -N49 are located on the northwest <br />end of Cross Section A -A'. Monitoring holes GW -N50 through GW -N52 and GW -N53 through <br />GW -N55 are located on the northeast and southwest ends respectively of Cross Section B -B'. <br />The NHN Mine permit area is shown on Maps 2.04.5 -1 and 2.04.7 -1. These maps also show the <br />topography of the NHN area. The permit area is drained to the west and north by tributaries of <br />Coal Canyon and to the south by tributaries of Tuttle Draw. The surface water divide between <br />Tuttle Draw and Coal Canyon is located in the southern most part of the proposed mining area. <br />Relatively deep incision of the strata to be mined by Coal Canyon, Tuttle Draw, and their <br />tributaries results in a some what small and isolated hydrologic system. This system is <br />completely isolated from the New Horizon Mine effects on both surface and ground water <br />because of the stream incision of Tuttle Draw. The projected outcrop of the LDx Seam is shown <br />Section 2.04.7 Page 1 November 2011 <br />