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material and further sliding could be triggered. Little, if any, flow has historically occurred in the ditch. Any small flows which are not diverted in the area of the slide can be accommodated by WEM's mine site sedimentation & runoff containment system. 4. An "extra" ditch appears to exist at the margin of the east toe of the refuse pile and a pile of boulders located between the toe of the refuse pile and the east perimeter ditch. The boulders were excavated from the Phase IV area of the Lower Refuse Pile. Minor Revision #67, (approved 2/06/90), allows MCC to pile these boulders onto the east toe of the Lower Refuse Pile. This buttress is to be completed by September 30, 1991, and will remove any confusion that an extra ditch exists. 5. See the response to question II. "Surface Hydrology", below. 6. All sedimentation ponds at the West Elk Mine site have separate principal dewatering & emergency spillway systems. No revisions are presently required to meet the current sediment pond & impoundment performance standards. VII. Bonding 1. Greystone Consultants Inc. will be recalculating MCC's reclamation bond in coordination with the CMLRD as part of the permit update & restructuring process and will be completed by October 31, 1991. I. Permit Boundary 1. The loadout facility is entirely contained within WEM's permit boundary. The permit boundary signs were conveniently hung on the fence which surrounds the building & area which drains to the sediment pond. The steel beams located on the north side of the railroad tracks which support the loading chute & weigh bin over the rails are within the permit area but do not drain to the pond as they are considered a part of the exempt rail area. Signs will be placed on the beams to clarify that they are within the permit boundary. No revision is required.