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• • iii iiiiiiiiiiiiiiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of Natural Resources <br />1317 Sherman St., Raom 215 <br /> <br />Denver, Colorado 80203 I~~~ <br />Phone. (7031 866-7567 <br />FAX: 130]1 872-8106 <br /> DEPARTMENT OF <br /> NATURAL <br />May 9, 1995 <br /> RESOURCES <br />Mr. George Patterson Roy Romer <br /> <br />Kerr Coal Company Governor <br /> <br />P.O. Box 487 lames 5. Lochhead <br />Execolive Uveaor <br />Walden, CO 80480 M.rnael a ~~nF <br /> Dwrsron Dueclor <br />RE: MR-21, Permanent Ditch Designs for PD-1 and PD-2, <br />Kerr Coal Company, Marr Mine, Permit No. C-80-006. <br />Dear Mr. Patterson: <br />The Division received your application for MR-21, Ditch Designs for PD-1 and PD-2, on <br />5/3/95. Designs for ditches PD-1 and PD-2 aze currently approved to safely pass runoff <br />volumes generated from the 100 year, 24 hour precipitation event. MR-21 will alter <br />those design requirements to 10 year, 24 hour. Rule 4.05.3(3) allows the Division to <br />approve designs for PD-1 and PD-2 based upon the 10 year, 24 hour design <br />requirements; however, 1.04(136) states that design changes for regulated structures shall <br />be handled appropriately as a technical revision. <br />Please withdraw your application for MR-21 and submit your request to change the <br />designs for PD-1 and PD-2 as a technical revision. My records indicate that the next <br />application for technical revision should be TR-14. Please submit a cover letter <br />requesting withdraw of MR-21 and inclusion of materials previously submitted under <br />MR-21 into TR-14, accompanied by an application form for TR-14 and a copy of your <br />proposed public notice. <br />Please contact me if I can be of greater service. <br />Sincerely, <br />Wallace H. Erickson <br />Environmental Protection Specialist <br />cc: Jerry Nettleton, TerraMatrix, Steamboat; <br />Thomas Leidich, TerraMatrix, Lakewood. <br />