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Section 816.73 (b) Continued. <br />• (2) A filter system to ensure the proper functioning of the rock core <br />shall be designed and constructed using standard geotechnical engineering <br />methods. <br />(3) The grading may drain surface water away from the outslope of the <br />fill and toward the rock core. The maximum slope of the top of the fill <br />shall be 1v:33h (3 percent). Instead of the requirements of Section <br />816.71(g), a drainage pocket may be maintained at the head of the fill <br />during and after construction, to intercept surface runoff and discharge <br />the runoff through or over the rock drain, if stability of the fill is <br />not impaired. In no case shall this pocket or sump have a potential for <br />impounding more than 10,000 cubic feet of water. Terraces on the fill <br />shall be graded with a 3- to 6-percent grade toward the fill and a 1- <br />percent slope toward the rock core. <br />Energy Fuels will not be disposing of excess spoil in a head-of- <br />• hollow fill. <br />(c) The drainage control system shall be capable of passing safely the <br />runoff from a 100-year, 24-hour precipitation event, or larger event <br />specified by the regulatory authority. <br />Energy Fuels will not be disposing of excess spoil in a head-of- <br />hollow fill. <br />Section 816.74 Disposal of excess spoil: Durable rock fills. <br />In lieu of the requirements of 816.72 and E16.73, the regulatory auth- <br />ority may approve alternate methods for disposal of hard rxk spoil, <br />including fill placement by dumping in a single lift, on a site specific <br />basis, provided the services of a registered processional engineer <br />experienced in tine design and construction of earth and rockfill embank- <br />• 816-100 <br />