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~IAD WESTERN CORPOR~ON III I II I II I II IIII III <br />II990 GRANT STREET <br />SUITE 555 <br />DENVER, CO 80233 <br />RFrFI~lFfti <br />FEB 0 ~ 1996 <br />February 6, 1996 <br />Division o1 Mme~a~s & G°o~ot~V <br />Ms. Christina L. Kamnikar <br />Division of 1\7inerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Response to Technical Adequacy Review of Amendment Application for l 12 Permit; #M-88-044, <br />Coal Creek Resources <br />Deaz Ms. Kanmikaz: <br />We have reviewed the Division of Minerals and Geology adequacy response letter dated January 12, 1995, <br />regarding the Coal Creek Resources amendment application. This letter addresses each of the issues as they <br />are presented in the Division's adequacy review letter. <br />a) The diversion channel constructed azound the active mining area will have similar dimensions <br />and slope as the existing channel. The depth of the existing channel ranges from one to three <br />feet and has an average width often feet. The slope of the existing channel has an average <br />slope of .7%. <br />Other than sloping, the diversion channel banks a minimum of 3H:1 V. No other stabilization <br />measures will be taken to prevent erosion and sedimentation. The diversion channel will not <br />be stabilized further for two major reasons: 1) The diversion channel is temporary and it will <br />be relocated on regular basis; and 2) Coal Creek is an ephemeral stream system and rarely <br />flows in this section. <br />b) The Coal Creek channel meanders within the lowland mining azea. Sections of [he chaimel <br />will be relocated on the opposite end of the mining progress. Attachment 1 is a schematic <br />drawing showing this concept. <br />c) Once mining is completed, the channel will be brought back to its pre-mining course. We <br />have estimated that no more than 1000 feet of channel will be relocated at any given time. <br />The construction of the final channel is expected to take a half day to complete with minimal <br />expense. This cost was included in the amended reclamation bond calculation. <br />2) If the groundwater level drops two fee[ below the pre-mining groundwater level in the <br />cottonwood groves, the depth of mining will be reduced and/or the setback from the <br />cottonwood groves will be increased. <br />