2012-10-18_REVISION - C1980004 - Laserfiche WebLink

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Mike Boulay upland areas that can't be seen on Figure 2.2 -3. A note was added to 2.2- 3 to see 2.2 -3a for full view of upland areas. • On revised page 2.05 -21, the use of a centrifugal pump is mentioned as an optional way of dewatering the sediment pond. The Division requests that mention of this option be added to Section A -A' of Figure 2.2 -3. No pump to be used, page 2.05 -21 revised. MCM: No longer applicable, please see approved Figure 2.2 -3. 101. The Structure Networking sheets on pages 20 and 21 of Appendix M show that culvert C -13 flows directly into the sediment pond and that culvert C -18 flows directly into ditch D -18. However, on Figure 2.2 -3, the culvert leading directly to the pond appears to be labeled as culvert C -18 and culvert C -8 leads into ditch D -18. Please explain. MCM: No longer applicable. 102. Several of the ditch designs show water velocities above 5.0 feet per second but not all of the ditches are designed to be riprapped, including ditches D -3, D -5, D- 11, D -30 and R -1. Please explain. MCM: No longer applicable, no surface expansion proposed. 103. Please add a discussion to the permit text, or point out where such a discussion is located in the permit, concerning inlet and outlet protection for culvert C 11. MCM: No longer applicable, no surface expansion proposed. MCM: No longer applicable, no surface expansion proposed. -36- October 16, 2012 104. Because culvert C 11 will be about 600 feet long, does MCM intend to construct access sites in case the culvert gets blocked or construct inlet protection to minimize debris entering the culvert? Please add a discussion to the permit text concerning this issue. 105. On page 1 of Appendix N - Probable Hydrologic Consequences, Figure 4.2 -3 is referenced as showing the projected saturated zone of the Cameo Coal Seam. Please update Figure 4.2 -3 to reflect the projected saturated zone given the mine expansion and new permit boundary proposed with PR -2.