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• <br />C J <br />4.3 PROPOSED CONSTRUCTION <br />I 4.3.1 Waste Rock Pile <br />We recommend that the waste rockpile be constructed to <br />generally comply with the requirements of Section 4.10 of the <br />CMLRB regulations with the exception of Section 4.10.3, Water <br />Control Measures, which will be discussed subsequently. <br />Our stability analyses, as presented in Appendix C, in- <br />dicate that the safety factor of a pile constructed withl(v): <br />2.0(h) side slopes should exceed the required value of 1.5. <br />The height of the pile should not exceed 50 feet above the <br />existing ground surface without first evaluating the effect <br />~i of the increased load on the stability of ttLe piJ_e, sLLrface <br />dater control, and _°inal reclamation. <br />Since our analyses have assumed that the waste pile will <br />~ be fully drained, an interceptor ditch should be constructed <br />I upslope of the pile to prevent surface runoff from entering <br />the area. The ditch should be stabilized and designed to <br />I' pass a 100-year, 24-hour precipitation event. The ditch <br />should be located at a sufficient distance from the toe of <br />it the pile to enable access between ditch and the pile. <br />I <br />After final grading and covering of the pile, any nearly <br />horizontal sections above the 1(v):2.0(h) side slopes should <br />I be sloped outwards at a slope not exceeding 1(v):20.0(h). <br />There should be no depressions on the surface of the pile <br />I <br />I~ where ponded water could accumulate. <br />Surface runoff from the pile should be conducted to a <br />runoff pond in stabilized channels which caill safely pass the <br />runoff from the 100-year, 24-hour precipitation event. <br />• <br />- 2 l - <br />GE6XYDR0 CONSUL~ING.INC. <br />