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Satimr - 2.05.3 HH. Ells Creek Culvert - In conjunction with the historic Sotnetset Mme C Seam minutg • activities, U.S. Steel placed approximately 800 feet of 9-foot diameter culvert in the Elk Creek drainage channel and backfilled over the culvert to create a level facilities area neaz the mouth of Elk Geek Canyon. OMI has subsequently extended this culvert another 650 Feet to accommodate progressive mine expansion activities. The culvert has been sized, bedded, placed, and backfilled to assure it's long-term stability. The Elk Creek culvert is designed to safely pass the peak flows resulting from a 100-yEaz, 24-hour storm event and is permitted under applicable provisions of Na[ionwide Pemut 26 by the U.S. Army Corps of Engineers (Fermi[ No. 199675449). OMI proposes to culvert two additional segments totaling approximately 1,600 feet of the middle portion of Elk Creek in order to establish a haul road and facilities pad for the new Elk Leek Mme. II. Ells Geek Canyon Road -The Elk Creek Canyon road was apre-law road extending from the main haul road part way up Elk Geek Canyon. The lower portion of this road was modified and improved a short distance beyond the Elk Geek Facilities area in conjunction with previous mining-related activities. Expansion of the Elk Geek coal stockpile in 1997-1998 cut-off access to this road at the lower end of Elk Geek Canyon. Access was reestablished by a light-use road extending from the Cemetery up the west side of Elk Geek Canyon to tie-in with the existing road. OMI proposes to modifythis light-use road and the middle portion of the Ells Creek Canyon road as a haul road to access the Elk Geek Mme facilities and operations. Additional detail on this road is provided in the subsequent roads section. JJ. ID. Signs (Rule 4.02) -Mme and permit identification signs are displayed at each entrance to the pemut area from public roads. Sanbom Creek Mine Facilities -See the General Facilities Maps, (Map 2.05-M1), and the Facilities Detail Maps, (Map series 2.05-M3x). A. Sanbom Geek Mme Haul Road -The haul road accessing the Sanbom Geek Mine portak begiru in the Elk Creek Facilities area from the main haul road and extends approximately 4,500 feet to the northeast. The haul road, which is approximately 20 to 30 feet wide, and the Sanbom Creek Mme overland conveyor are contained within the 30- to 40-foot road comdor. The gravel-surfaced road is used for transportation of then, equipment, and supplies and may be aced in an emergency or if the conveyor belt is down for haulage of coal, coal refuse, or mine development waste. Additional details on mine roads are provided in the subsequent roads section. B. Sanbom Creek Mme Overland Conveyor - Coal is transported from the Sanbom Creek Mme portak by an overland conveyor. This conveyor previously extended to the existing dump station, however, modificatioru to coal handling systems in conjunction with the 1995-2000 mine expansion increased conveyor capacity and re- routed the conveyor discharge to the Stacking Tube No. 1 headhouse. The Sanbom Creek Mme conveyor has a capacity of approximately 2,300 tons per hour consistent with the tnaramum annual production rate of 4,800,000 tons annually. The conveyor design includes partial covets for dust control, walkways for inspection and maintenance, and emergency stop controk in compliance with applicable MSHA safety regulations. Additional details on coal handling systems are provided in subsequent coal handling section. • G Declines to the GSeam -Three declines, including the intake, beltline, and return entries and the associated concrete, structural steel and comtgated metal Eace-up stmctures extend from the finished grade at the Sanbom Geek Mme portal area down to the GSeam. The declines extend about 70 feet, in horizontal distance, from elevation 6,057 to 6,044. During 1995, an additional rock slope was developed from PR04 2.05-18 Revised August 2000