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All unconsolidated surficial deposits in the immediate RDA toe region will be stripped to <br />bedrock to provide a firm foundation base. <br />2.04.7 Hydrology Description <br />(1) Groundwater Information <br />A detailed investigation of the groundwater hydrology for the permit area was conducted <br />by Water, Waste, and Land in 1980. The investigation was updated by a report prepared by <br />Basin Resources in 1994. These reports are provided in Exhibit 8— Hydrology and Geology <br />Information. Both investigations indicate that groundwater resources in the Raton Formation <br />near the New Elk Mine are limited. Additional hydrologic testing for the project area was <br />performed in 2010 to support the permit renewal for mining in the Allen and Apache coal seams. <br />The 2010 testing program focused on evaluating the permeability of the coal beds and adjacent <br />rocks. Three monitoring wells were also installed to evaluate bedrock groundwater levels. The <br />results of the 2010 hydrologic investigation are summarized in the following sections. Complete <br />documentation for the program is presented in Exhibit 8. <br />2010 Groundwater Investigation <br />Hydrogeologic studies during 2010 included the installation of three bedrock monitoring <br />wells and packer permeability testing in exploration boreholes. The monitoring wells NE -1 -10, <br />NE- 6- 10(a), and NE- 6 -10(b) were installed in the Allen, Apache, and Blue coal seams, <br />respectively. Packer permeability tests focused on evaluating the hydraulic conductivity of the <br />Raton Formation between the Allen and Blue coal seams. Results from the packer testing <br />program are summarized in Table 8. Well completion details and water level elevations are <br />summarized in Table 9. <br />Table 7. Joint Orientation of the Refuse Disposal Area (RDA) <br />STATION <br />STRIKE <br />DIP <br />1 <br />N78E <br />86N <br />2 <br />E -W <br />87N <br />3 <br />N88W <br />86N <br />5 <br />N75E <br />86S <br />N82E <br />88N -86S <br />8 <br />N79E <br />84S <br />TR -56 2.04 -17 Revised 2/1/11 <br />