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General Comments (New) <br />6. The Volume IX text refers to various coal mine waste ("Gob") piles, numbered 1 through <br />4, and the west expansion area of Gob Pile #2. The various Gob piles are not identified <br />on the Maps (Figures) for Volume IX. <br />Please identify the various coal mine waste piles on the figures in Volume IX. <br />7. On Volume IX, Figure 1, Section D-D', there is an unidentified blue line that roughly <br />parallels the green original ground surface line. <br />Please identify the blue line, or remove if it is irrelevant. <br />In the Legend for Figure 2 (Volume IX), symbols for the rock drains and the lateral <br />subdrains have not been provided. There are also some small, fuchsia concentric circles <br />near the haul road that are not identified in the legend. <br />Please modify the Legend for Figure 2 to include symbols for the items listed <br />9. In the southwestern corner of Map 15-3 is proposed Gob pile, with a note to refer to <br />Volume XI. <br />Please verify that Volume XI is correct (perhaps it should be Volume IX?). <br />Hydrologic Review <br />10. The hydrology designs were well done. However, a few minor changes need to be made <br />in the table on page App-B9 of Appendix B entitled "Summary Coal Mine Waste <br />Disposal Area Ditches and Culverts" and on Figure 3, entitled "Coal Mine Waste <br />Disposal Area Pond F Detail". <br />A. For ditches F6 and F18, the ditch depths listed in Appendix B for the minimum <br />grade and for the maximum grade should be the same for each ditch since the <br />grade of each ditch is continuous. The same is true for the velocities for <br />minimum and maximum grades. Please revise Appendix B accordingly. <br />B. The peak flow for ditch F9 is listed in Appendix B as being 0.00 cfs instead of <br />the 1.67 cfs listed on page App-B20. Please revise. <br />C. For ditch F14, the D50 size is listed in Appendix B as being 21 inches in the <br />table but as being 9 inches on page App-B25. Please revise accordingly. <br />4