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r <br />about 1500 feet. Please make the modifications to the data, <br />including any resultant calculations, or justify the use of <br />the submitted values. <br />18. On Map 20, Sedimentation Control Plan, for greater clarity, <br />please add an annotation arrow from "C-B1" to the appropriate <br />culvert. <br />19. On Map 21-1, Drainage Plans, and on Map 20, Sedimentation <br />Control Plan, there appears to be an unlabelled ditch that <br />leads into culvert C-B12. Please add a label to this ditch. <br />20. In the Culvert Summary and Minimum Size Requirements table on <br />page 26 of Exhibit 8, and referring to Map 21-1, Drainage <br />Plans, for culvert C-B12, it appears that "Ditch B-24" should <br />be changed to "Ditch B-19." <br />21. In the same table that is referred to in item #14 above, <br />please explain the reason why culvert C-13, and its value of <br />-1.88 cfs is used for culvert C-B12. <br />22. Please add the data for culverts C-D1, C-E1, C-F1 and the <br />culvert at the base of the gob pile to the Culvert Summary and <br />Minimum Size Requirements table, found on page 26 of Exhibit <br />8. <br />23. On Map 20, Sedimentation Control Plan, and on Map 21-1, <br />Drainage Plans, please add the annotation to the culvert at <br />the base of the gob pile. <br />24. Please add the annotation of culvert C-F1 to Map 20, <br />Sedimentation Control Plan. <br />25. On page 23 of Exhibit 8, a statement is made that flows <br />greater than 6 fps in ditches are considered to be erosive. <br />The Division would like to state its position that erosive <br />velocities depend upon the type of soil and the amount and <br />type of any vegetation in the ditch. As a general guideline <br />only, the Division has, in the past, used 5 fps as the <br />threshold velocity for erosion. <br />26. On Map 20, Sedimentation Control Plan, please add annotations <br />for ditches D-F1 and D-F2. <br />27. Please add the data for ditches D-D1, D-D2, D-E1, D-F1 and D- <br />F2 to the V-Ditch Design table, found on page 24 of Exhibit 8. <br />28. The operator has requested, on page 12 of section 4.1.5 of <br />Volume IV, small area exemption status for the coal waste pile <br />topsoil stockpile and the coverfill stockpile. However, no <br />designs have been submitted, pursuant to Rule 4.05.2(3). <br />Please submit such designs, after which the Division can <br />5 <br />