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Technical Revision No. 79 Page 2 February 7, /997 •The drilling of a deep drillhole which penetrated bedrock to show the competency of the rock -Figure E-l, Appendix E cmd Appendix K •A design for the Sylvester Gulch crossing for the 100-year, 24-hour storm event -Appendix L .A simulation to look at the timing of the Phase 1 cut and the filling of coal refuse -Enclosed for the Division's fries •An analysis of the unnamed gulch to determine if the addition of water from the clear water diversion ditch will be handled through the gulch and the existing State Highway culvert. - Appendix L •The use of contour furrows on the final reclaimed slope of the RPE -Figure L-3, Appendix L North Soil Storage Area There are currently no available sites within the West Elk Mine facilities area to locate additional subsoil and topsoil stockpiles. MCC has therefore, proposed the North Soil Storage Area on the north side of State Highway 133 directly across from the mine entrance. It is anticipated that only two piles (one for subsoil and one for topsoil) will be needed, but MCC has designed two additional piles for any unknown surplus. In the interim, the location of the eastern most subsoil pile will be utilized as a construction staging area when work begins on the projects proposed in this revision and the Sylvester Gulch Facilities Area (Plt#07). MCC anticipates that mobile, office construction trailers, construction equipment and light vehicles, and materials will be located in this area. If a portable fuel tank is located at the staging area, secondary containment (e.g. berms, etc) will be provided. MCC proposes this azea for a small area exemption (SAE) and will utilize alternative sediment control (e.g., silt fences, straw bales, vegetation, etc.). The construction staging area will also utilize alternative sediment control. Before the LRP can be filled to design capacity, the existing subsoil and topsoil stockpiles must be removed from the top of the L1tP. MCC anticipates needing to move a portion of this soil to the North Soil Storage area, as a majority of the soil will be used for reclamation of the L1tP. The North Soil Storage area has been added to Maps 53 and 54. Also enclosed is a larger scale of this area for the Division's files. Mine Entrance Improvements In an effort to control access to the West Elk Mine, to provide a safer intersection with State Highway 133, and enough room for vehicles to turn-azound at the entrance, MCC is proposing to