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OF.COIp <br /> Ham \g DEPARTMENT OF NATURAL RESOURCES <br /> * (may * David H.Getches,Executive Director <br /> MINED LAND RECLAMATION DIVISION <br /> f 878 DAVID C.SHELTON, Director <br /> Richard D.Lamm ` <br /> Governor <br /> June 23, 1986 <br /> Mr. George Wear <br /> Mid-Continental Resources, Inc. <br /> 201 Centennial Street, Suite 406 <br /> Glenwood Springs, CO 81601 <br /> RE: TR for Sutey Expansion, C-017-81 <br /> Coal Basin Mines <br /> Dear Mr. Wear: <br /> Dr. J. Pendleton, Jeff Deckler and I have completed review of the TR for <br /> adequacy. The following concern needs to be addressed. <br /> The sizing for the dewatering orifices of the lower pond has not been <br /> submitted. The center of mass of the 10-year flood volume should be routed <br /> through both ponds giving time of detention of the center of mass. Division <br /> policy is to require 24 to 36 hours of detention time for the center of mass. <br /> The lower pond dewatering orifice size should be sized accordingly. <br /> If you have any questions, please call . <br /> Sincerely, <br /> 4rdace M. Thompson <br /> Hydrologist <br /> CMT/cj <br /> 1503F <br /> 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />