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~i~ Each detailed design plan for a structure shall: <br />(A) Be prepared by, or under the direction of, and <br />certified by a qualified registered professional engineer with assistance <br />from experts in related fields such as geology, land surveying, and <br />landscape architecture; <br />(B) Include any geotechnical investigation, design, <br />and construction requirements; <br />(C) Describe the operation and maintenance <br />requirements for each structure; and <br />(D) Describe the timetable and plans to remove each <br />structure, if appropriate. <br />(iii) If a sediment pond or impoundment has a capacity of <br />more than 1,000 acre-feet, or has a dam or embankment in excess of 10 feet <br />in vertical height, from the bottom of the channel to the bottom of the <br />spillway, or has a surface area at high waterline in excess of 20 acres, <br />•_ then each plan under 2.05.3(4)(b) or (c) shall meet the applicable <br />requirements of the State Engineer in accordance with C.R.S. 37-87-105. <br />In cases where a sedimentation pond or impoundment meets or exceeds the <br />criteria of 30 CFR 77.216(a), then the permittee shall also comply with the <br />applicable requirements of the Mine Safety and Health Administration, 30 <br />CFR 77.216(1) and (2). <br />(b) Sedimentation ponds. Sedimentation ponds, whether temporary <br />or permanent, shall be designed in conformance with the requirements of <br />4.05.6. Any sedimentation pond or earthen structure which will remain on <br />the proposed permit area as a permanent water impoundment shall also be <br />designed to comply with the requirements of 4.05.9. <br />(c) Permanent and temporary impoundments. Permanent and <br />temporary impoundments shall be designed to comply with the requirements of <br />4.05.9. <br />~1 <br />2.05-15 <br />