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Mr. John T. Ungefug -2- March 11, 1986 reconstruction during reclamation, etc.). Such a ditch may be considered a permanent, man-made structure within 200' of the affected land and thus require protection as per 34-32-115(4)(d) of the Act. These same comments apply to the Colorado Interstate Gas Company line which runs adjacent to the northeast corner of the plant site. You must either demonstrate technically that your operations will not affect such structures, present a signed agreement with owner of these structures that any damage to them will be compensated by your company, or move your affected land boundaries 200' or more from the structures involved. 2. What are the existing stockpiles (or depressions) shown near the ~ northern boundary of the pit area on Map C-C-1, and how will they ~/ interact with the mining plan? A similar feature is shown to the west /` of the plant site on Map C-C-2. Please clarify this map feature, as well. 3. The location of all topsoil stockpiles should be shown on one of the various Exhibit C Flaps. (I note some stockpiles on Map Exhibit F. Will this location be typical over the entire permit area?) 4. The location of the settling ponds and discharge area should be shown on \ / Map C-C-1. Details concerning their construction and operation should /l\ be given as a part of Exhibit D. Exhibit D - Mining Plan 1. Given our past experience of several years, a minimum totally undisturbed setback of 100' should be maintained between the banks of any perennial stream all mining operations. This aids in protection of these streams during mining and assists in long-term stability of the ~ reclaimed area. Furthermore, this will assist in minimizing impact to riparian habitat. Please commit to such a 100' setback. 2. Please clarify the planned maximum depth of mining and be more specific \ as to where this will occur. Please do the same for the shallower /x\ mining depths. Then correlate this with the areas to be mined wet as opposed to those to be mined dry. 3. Please clarify your topsoil salvage plans. All available topsoil should be salvaged for use in reclamation. Given the soils data you presented, there should be at least enough topsoil available for a 6" replacement depth, especially with 10 acres of lake planned. All topsoil stockpiles should be planted with a perennial grass cover crop (SCS can help you specify such a mixture to us) and graded to no steeper than 2H:1V for purposes of stabilization. I further suggest that such stockpiles be located as far from the river as possible (within the permit area but not within the 100' setback from the river or within necessary setbacks from the ditch).