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Description of the Environment <br />Location of the Permit Area <br />Township 6 North, Range 87 West of the 6h Principal Meridian <br />Section 28: Portions of SEA NW/4, SWANEA, NW/4 SWA <br />Section 29: Portions of E/2 SEA, W/2 SEA, NEA SE/4 <br />Section 32: Portions of W/2 E/2 <br />Township 5 North, Range 87 West of the 6h Principal Meridian <br />Section 5: Portions of W/2 E/2 <br />Section 8: NW/4, SWA, W/2 NEA, W/2 SEA <br />Section 16: SWA NW/4, NW/4 SWA, and portions of SWA SWA, <br />NW/4 NW/4, SEA NW/4, NEA SWA, NW/4 SEA <br />Section 17: All <br />Section 18: NEA SEA, S/2 SEA <br />Section 19: E/2 and portions of E/2 W/2 <br />Section 20: SWA NW/4, W/2 SWA, N/2 NW/4, and portions of N/2 NE/4 <br />Section 29: NW/4 NW/4 <br />Section 30: N2 NE/4. <br />The Yoast Mine area is located approximately 8.5 miles southwest of the town of Hayden, <br />Colorado, and is positioned between two existing coal mining operations. The Yoast Mine plan <br />area is approximately 4 miles southwest of the Peabody Sage Creek Mine (presently in <br />Temporary Cessation status) and 3.5 miles east of the Seneca II -W Mine (presently in Permanent <br />Cessation status). The mining area is located between Sage Creek and Grassy Creek and is <br />found on USGS Mount Harris and Dunkley maps. Production of coal last occurred in February <br />of 2006. <br />Geology and Topography <br />The Yoast Mine permit area is located within the Wyoming Basin Physiographic Province. <br />Elevations within the permit area range between 6,530 feet along the northern end of Haul Road <br />A and 7,980 feet at the summits of ridges within the southeastern portion of the permit area. <br />Slopes range from 1 ° in Scotchman's Gulch to 100° at isolated sandstone bluffs. The terrain is <br />characterized by broad west and northeast facing moderately sloping benches and ridges that are <br />deeply incised, and barren, brush covered, southwestward facing cliffs where more resistant <br />sandstone outcrops exist. The long, sloping landforms of these areas roughly coincide with the <br />strike and dip of the underlying bedrock. <br />The permit area is dissected by several small, ephemeral drainages which flow into two principal <br />stream systems: Sage Creek on the southwest and Grassy Creek on the southeast. A detailed <br />discussion of the Yoast Mine surface water system is presented in Tabs 7 and 16 of the permit <br />application package (PAP). <br />4 <br />