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surface (pg. 15). Are these depressions to be intentionally created? <br />If so, please describe them in greater detail. <br />p) The staff would recommend fertilizing with phosphorus and potassium <br />prior to seeding (in quanti[ites determined by soil tests). This <br />fertilizer should be disced into the soil. Nitrogen fertilizer is best <br />applied the year following seeding, in order to discourage weed growth. <br />A surface application would be adequate. <br />q) Revegetation of Mann Draw will also be required. How will this be <br />accomplished through six inches of gravel? <br />r) Reclamation of the access road must be discussed in greater detail, <br />in terms of the reclaimed topography, depth of topsoil replacement, <br />and revegetation. How will road surfacing materials be diposed of? <br />s} The proposed channel configuration for the restoration of Mann Draw <br />is currently being reviewed by the geomorphologist on our staff. You <br />will receive his comments shortly. <br />IV. Water Information: Groundwater <br />a) The potential impact of the proposed mine on groundwater hydrology <br />needs to be assessed in greater detail, both in terms of the situation <br />during mining, and following reclamation. A listing of points which <br />need to be addressed follows: <br />b) Additional information concerning the bedrock aquifer must be pro- <br />vided. What is the source of this water (recharge zone)? Based on the <br />information provided by the applicant, the bedrock aquifer would appear <br />to be tributary to the Mann Draw alluvium. An estimate of the quantity <br />of water contributed by the bedrock aquifer should be provided. <br />c) Information provided by the applicant would indicate that the bed- <br />rock aquifer might be contained either within the Sudduth seam, or else <br />in one of the sandstones between the Sudduth and the Hoyle. <br />d) What will be the impact of mining on the bedrock aquifer? If, as <br />stated in the application, the backfilled pit will be more p2r v+ou5 to <br />water than the existing condition, where will this water go? Most <br />likely, it will no longer be tributary to Mann Draw (due to the depth <br />of the backfill). Will the loss of this water constitute a signifi- <br />cant impact on the Mann Draw alluvial aquifer? . <br />e) The staff would agree that the Mann Draw alluvium is the most sig- <br />nificant aquifer on the property. The applicant should provide informa- <br />tion concerning the transmissivity of the Mann Draw alluvium, and the <br />quantity of subsurface low. How will mining affect this flow? Would <br />mining through Mann Draw be expected to have an adverse effect on down- <br />stream water rights, .particularly the small reservoir located 2000 <br />feet north of the permit boundary? <br />f) Additional thought needs to be given to the restoration of Mann Draw. <br />1n the plan which has been proposed, there would be nothing to prevent <br />the subsurface flow from the percolating through the replaced alluvium <br />and into the backfill materials beneath. This could cut off the flow <br />down [he draw. Some sort of impervious liner will probably be necessary. <br />g) The impact which mining through Mann Draw might have on the Canadian <br />River, an important alluvial valley floor, must be evaluated. Since <br />the Canadian River is a critically over-approFriated stream, any decrease <br />in the flow down Mann Draw caused by mining would be extremely important <br />(4) <br />