2009-02-19_PERMIT FILE - C1982056A (3)

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(c) The results of a geeotechnical investigation of the proposed disposal site includine the following (i) The character of bedrock and any adverse geologic conditions in the disposal azea; (ii) A survey identifvine all sprin¢s, seepage and around water flow observed or anticipated duringwet periods in the area of the disposal site; (iii) A survey of the potential effects of subsidence of the subsurface strata due to past and future mining onerations• (iv) A technical description of the rock materials to be utilized in the construction of those disposal stmctures containine rock chimney cores or underlain by a rock drainage blanket: and (v) A stabilit~analvsis including, but not limited to. streneth parameters pore pressures and long-term seepage conditions These data shall be accompanied by a description of all en ing Bering design assumesions and calculations and the alternatives considered in selecting the specific design specifications and methods. (d) If under 4.09.1(10), rock toe buttresses or key-way cuts are required, the applications shall include the following: (ii) En ineering specifications utilized to design the rock-toe buttresses or key-way cuts which shall be determined in accordance with 2.05 3(6)(c)(v). RESPONSE The partial highwall excavation and the ramps contain 68,000 BCY of material, which at a 28 percent swell factor equals 87,000 CY and the low-permeable barriers contains 20,000 CY of material. An additional 68,000 CY of spoil were required to fill the pit to an elevation of 6,860 feet. This material was pushed into the pit from the spoils to the south by dozers leaving the slopes at an angle of 2H:1V. The resulting level storage area is approximately 200 feet wide at the west end, 100 feet at the east end, and 1,700 feet in length. As neither excess spoil nor underground development waste will be generated in connection with the Fish Creek Tipple operation, the requirements of this section and Rule 4.09 do not apply. (7) Coal Handling Structures (a) A narrative and appropriate map. prepared to meet the standards of 2.10, generally explaining the location. construction, modification, use, maintenance and removal of coal removal, handling. storage, cleaning, and transportation azeas and stmctures in acwrdance with 4 O1 1 RESPONSE Coal-handling structures are shown on Map 24 (Sheet 1/3), Freshwater Systems and Surface Facilities. Over time, the coal-handling system has evolved, with numerous changes in both coal handling and equipment, as previously described under Rule 2.05.3, Mine Facilities (pgs 2.05-24 through 2.05-38) and supplemented by the brief summary and historic information grovided_in the following,sections. TR07-59 2.05-86 02/27/07