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~ ~ ~ III IIIIIIIIIIIII III M E M O R A N D U M T0: Carol Pehlke FROM: Jerry Zln~fer DATE: September 10, 1979 RE: Bourg Coal I have reviewed the sediment control plan and hydrology package for the purposeaBourg Coal Mine. It wntalns numeross deflcleneles which mjst be corrected before we can approve the appllca~llon. 1) Mlntng Through Mann Draw a. Water Rights - although this area Is primarily the concern of the Division of Water Resources,wwater rights should be addressed In the application submitted to this office. (1) Would mining through Mann Draw affect water supply (surface or groundwater) to the stock pond located downstream along Mann Draw? (2) The appllcantlswwell permit was denied because the water was probably tributary to the Canadian River. Mining through Mann Draw would interrupt both surface and sub-s~rfaee flow downstream. Is this of concern to Water R6sources7 b. Channel Reconstruction - reconstruction of Menn Draw should be based upon geomorphic considerations rabher than c~epe,cl~~~ upon structural controls (I.e. gravel). (2) The division needs a longitudinal profile of Mann Draw including upstrea~; downstream, and the area to be mined. The reconstructed channel should integrate with the undisturbed profile as smoothly as possible. (2) Under the interim rags, stream channel reconstruc~ Lions are viewed as equivalent to permanent diversions. As such they should be designed to safetly pass the 100- year event. (This should be calculated using anaac- cepted hydrologic method). (3) Dimensions of the actual channel should be based upon a width/depth ratio determined from field data. (4) I would prefer that the channel not be immediate- ly lined with gravel. This approach should be re- served as a mitigation of erosbn problems to develop. (5) The channel way should be revegetated with the s same type of vegetation as occurs presently. .~ ~I ~.i~'yY~