2013-10-08_PERMIT FILE - C1982056A (4)

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(c ) The permit shall not be approved by the Division until this information is made available in the application. RESPONSE This application contains comprehensive and detailed descriptions and maps concerning the geology and hydrology of the proposed permit area, adjacent area, and the general area. The definitions of these areas, as contained in Rule 1.04, have been applied in what TC believes to be a reasonable manner to the lands surrounding the planned mining operation. The permit area contains all lands on which the operator will conduct mining operations during the term of the permit. The adjacent area covers lands and resources outside the permit area which may be adversely affected by mining operations. The general area includes the topographic and ground water basin surrounding the area to be mined, including one or more watersheds containing perennial streams and ground water systems. The general area is of sufficient size to allow assessments of cumulative hydrologic impacts in the basin. A strict application of these definitions to Twentymile Park results in the areas shown on Map 4, Proposed Hydrologic Area Boundaries. The proposed permit area includes all lands to be disturbed by mining activities over the life of the Foidel Creek Mine. The proposed adjacent area includes the Twentymile Park ground water basin, including the downstream reaches of the perennial streams of Fish Creek and Trout Creek to the confluence with the Yampa River at Milner. The proposed general area includes the Twentymile Park ground water basin and the watersheds of Fish Creek, Foidel Creek, Middle Creek, and Trout Creek to the confluence with the Yampa River at Milner. Information sufficient for a complete response to this section on the geology and surface and ground water systems for all lands within the general area described above is included under Rules 2.04.6 and 2.04.7 of this application. SOUTHWEST MINING DISTRICT The general information provided above can be applied to the Southwest Mining District. This area is located within the surface and ground water basins described above. Map 4, Proposed Hydrologic Area Boundaries, has been modified to reflect the permit revision. EASTERN MINING DISTRICT A strict application of these definitions to Twentymile Park results in the areas shown on Map 4, Proposed Hydrologic Area Boundaries. The proposed permit area includes all lands to be disturbed by mining activities over the life of the Eastern Mining District. The proposed adjacent area includes the Twentyrnile Park ground water basin, including the downstream reaches of the perennial streams of Foidel Creek, Middle Creek, and Trout Creek to the confluence with the Yampa River at Milner. The proposed general area includes the Twentymile Park ground water basin and the watersheds of Fish Creek, Foidel Creek, Middle Creek, and Trout Creek to the confluence with the Yampa River at Milner. The general information provided previously can be applied to the Eastern Mining District. This area is located within the surface and ground water basins described above. Map 4, Proposed Hydrologic Area Boundaries, presents the area covered in this permit application. The ground water inflow into the mine during the proposed longwall operation in the Eastern Mining District was calculated with the application of an analytical method (Maximov, 1975). Results of these calculations are presented in Exhibit 9A, Ground Water Inflow Into Mine, Eastern Mining District, Tables 1 and 2. These equations were developed for calculation of ground water inflow into horizontal sections of an underground mine, and are the basis for the mine inflow calculations: RN l 2 -06 2.04 -9.2 i 04/01/13)