2010-02-24_REVISION - C1996083 (3)

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0 2.05.3 3. Utility Corridor A utility corridor was constructed to provide a cleared route for the water line, power line and downhill conveyor. The proposed surface disturbance is a steep corridor about 3,000 feet long. 4. Benches The proposed surface disturbance for the upper mine facilities includes the construction of benches with related access roads. The first or upper is a utility bench for a water tank, electrical substation and ventilation shaft and two fans. The second bench or D -Seam portal bench is developed for an office, change house, shop, warehouse, screen and crusher building, coal stockpile, reclaim tunnel, radial stackers and other facilities. Portions of the portal bench will be utilized for material storage and other mine facilities that are discussed in section 2.05.3(3). A small bench along the haul road was constructed for the downhill conveyor transfer and drive building. The B- Seam portal bench was developed during 2003 for mine entries, portal conveyor, transfer tower and other facilities. Another bench was constructed along old State Highway 133 for the coal stockpile, reclaim system and truck loadout. The Hubbard Creek shaft bench was constructed in 2007 & 2008. It is located immediately west of Hubbard Creek Road approximately three tenths of a mile north of the USDA -FS boundary. The Hubbard Creek shaft pad was strewn with large sandstone boulders. These boulders were mechanically broken into —24" minus rocks. Some of the rocks were used on site to stabilize cut and fill slopes. Some were taken to a temporary rock storage area near Freeman Gulch. Approximately 1,300 cubic yards of rock and dirt were hauled to the Bowie No. 1 Mine for permanent disposal. Based on the Operators knowledge of geology in the area, sandstone is non -toxic and non acid forming. The slope above the B -Seam portal bench is unstable and has caused problems with the haul road and has partially crushed out one of the B- Seam portal entries. The Operator has decided move the haul road to the north and re -align curve #11 in order to flatten the slope above the B- Seam portal bench. The plans for this project are shown on Maps 15 -5 and 15 -6. The project includes the construction of a riprap reinforced slope above the B -Seam Portals and two soil nail retaining walls. Soil nail wall #1 and #2 are 220 feet long and have 2,170 and 1,630 face square feet respectively. A 350 foot long French drain will be constructed along wall #2. Approximately 8,000 cubic yards will be rearranged on the face • PR-12 2.05-11- 02/10