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III IIIIIIIIIIIIIIII <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1 J 13 Sherman SI., Room 215 <br />Denver, CO 80203 <br />Phone: (303) 866-3567 <br />FAX: 1303) 832-8106 <br />May 5, 1993 <br />Mr. Mark Kerr <br />Operations Manager <br />Landmark Reclamation, Inc. <br />4901 South Windermere <br />Littleton, CO 80120 <br />Re: Rimrock Strip Mine, Permit No. C-89-074, Rimrock Coal Company <br />Technical Revision No. 2, Reduction of Required Pond Capacity <br />Dear Mr. Kerr: <br />pF _ ~p~ <br />i,'O. 4 <br />~~~ . <br />~~ <br />.,~~.~. <br />~~876 ~e <br />Rny Romer <br />Governor <br />Michael8 Long <br />Division DireUOr <br />The Division has determined that the submittal for TR-2 is incomplete. The <br />submittal only contained hydrologic information for total runoff volume. The <br />Division requires that peak discharge also be calculated. In addition, the <br />pond performance must be evaluated using the revised peak discharge and <br />volume. The 10-year 24-hour and the 25-year 24-hour events must be used. <br />Please refer to Section 2.05.3(4) in Volume I of the Rimrock permit applica- <br />tion for guidance in determining watershed runoff and pond performance. Pond <br />performance must meet the requirements of Section 4.05.6 of the Regulations, <br />as well as for the NPDES permit. <br />If you have any further questions, please call me. <br />Sincerely, <br />(~ D~,~,~ <br />seph J."Dudash <br />Reclamation Specialist <br />JJD/bjw <br />cc: Dan Hernandez <br />STATE OF COLORADO <br />7409E <br />