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-18- Mt. Gunnison Mine permit application, information and analyses contained in other permit applications for mines located in the general area and other available information including site visitation by members of the Division staff. Coal mining operations in the study area include: 1. West Elk Coal Company - Mt. Gunnison No. 1 Mine, CIdfRD File No. C-007-80. 2. Bear Coal Company, Inc. - Bear No. 1, 2, and 3 Mines, CMLRD File No. C-033-81. 3. Colorado Westmoreland, Inc. - Orchard Valley Mine, CMLRD File No. C-038-83. 4. U.S. Steel Corporation - Somerset Mines, CMLRD File No. C-022-81. This permit has been requested to be transferred to Kaiser Coal Company. 5. Blue Ribbon Coal Co. - Blue Ribbon Mine, CMr.Rn File No. C-047-81. This mine is currently undergoing permanent reclamation and is no longer conducting mining activities. 6. Western Slope Carbon - Hawk's Nest Mines, c'+II,RD File No. C-016-81. 7. Terror Creek Company - Terror Creek Loadout, CMr.Rn File No. C-059-83. All of these coal mines have life-of-mine areas within a 247 square mile subwatershed of the 978 square mile North Fork of the Gunnison drainage basin. All mining operations in the general area are underground operations, with the exception of Terror Creek Loadout which is strictly a loading facility. The life-of-mine areas of the underground mines are plotted on Figure 2. In addition, the coal seams to be mined, the area of surface disturbance, the area to be undermined during the first five year permit period and the area to be undermined during the life-of-mine are tabulated in Table 1. This assessment is divided into the three major subsections: General Description of the Hydrologic Environment, Probable Hydrologic Consequences of the Mt. Gunnison No.l Mine and Cumulative Hydrologic Impact Assessment. Sections have been added to this CHIS to specifically address any impacts associated with the proposed lower waste pile. These sections are clearly marked.