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iii iiuiiiiiiiiiiii <br />STATE, OF COLORADO <br />Roy Romer, Gove <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Director <br />DATE: January 6, 1989 <br />T0: Cdr, Richard ~4i115 <br />Supervisor Environmental Affairs <br />Cyprus Empire Corporation <br />P,O. Box 68 <br />Craig, Colorado 8162fir- <br />FROtd: Candy Thompson ~,~~ <br />P.E: Eagle 5 & 9, Refuse Area Diversion Design <br />I have reviewed the refuse disposal area design section. This section of the <br />permit application describes that the ditches were designed in accordance with <br />Rule 4.10.3-Refuse design. The report also describes the ditches as being <br />installed per design at 3 feet deep and a 1% grade. However, the permit <br />application conflicts between the refuse disposal area section describing the <br />ditch (Exhibit 21, page 3) and the hydrologic design section for the whole <br />mine (Exhibit 18), The sizing and acreages drained for ditches D 9-9 and D <br />9-10 in Exhibit 18 are incorrect and need to be amended. Also, even though <br />Exhibit 21 refers to the design no detailed design is given. <br />In summary, one design needs to be submitted giving a ditch configuration <br />adequate to pass the 100 year, 24 hour event. This needs to be submitted as a <br />technical revision. An on-the-ground check of the ditch size should also be <br />made and any modifications required documented in the revision. <br />CT/es <br />2397E <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80 20 3-2 27 3 Tel. (303) 866-3567 <br />