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Appendix K-5 <br />- • 165 South Union Boulevard, Union Tower, Suite 1000 Lakewood,CO 80228 <br />BE&K/TERRANEXT MEMORANDUM <br />To: Don MacDonald <br />Coors Energy Company <br />From: Gary R. Lake <br />BE&K/Terranext <br />Re: Existing and Post-closure Surface WaYai`"IeVlhoff Control <br />at Keenesburg Mine Site (Weld County, Colorado) <br />Date: May 21, 1998 <br />Existine and Proposed CEC Site Drainage Systems <br />The existing CEC site drainage plan and facilities are discussed in Appendix K, "Technical <br />Revision Drainage Control Plan II," dated June, 1994. Existing diversion/drainage ditches <br />that have been constructed along the access and haul roads and azound the north and east sides <br />. of the CEC property presently serve to convey surface water runoff to Sediment Pond 2. The <br />existing drainage facilities, as well as existing site topographic features, aze identified in <br />Appendix M-1 of the Permit. It is noteworthy that total long-term sediment accumulation in <br />Sediment Pond 2 has not been a problem in twelve years of use. The Dugout Pond shall <br />remain undisturbed at site closure in order to provide a continued wildlife habitat, in <br />accordance with direction by the Colorado Division of Minerals and Geology (CDMG). The <br />Dugout Pond was created dtuing CEC active mining operations and did not exist prior to CEC <br />developing the site for mining. The proposed permanent drainage facilities for final site <br />reclamation are indicated in Appendix Q-1 of the Permit. <br />The Final Reclamation Contour Map and Drainage Plan (Appendix Q-1) has been designed to <br />improve and promote positive surface water drainage away from both the existing A- and B-Pit <br />cell areas. For this reason, the proposed final ground surface contour elevations over the pit <br />cell areas have been modified from those initially shown on the 1986 Reclamation Plan map in <br />:. <br />Telephone: 303 914.1700 Facsimile: 303 914.1709 www.bektnxLCOm <br />