Laserfiche WebLink
Susan Burgmaier -3- September 16, 2013 <br />10. DRMS: The pagination of Appendix B pages 3 -end are inconsistent with the submitted <br />pages App. B -1 through B -2. Please renumber Appendix 8 for consistency. <br />BOW2: Please see revised Appendix B. <br />11. DRMS: The Subwatershed Hydrology Detail table is provided on page 17 of Appendix B. <br />There are three subwatersheds that should be assigned a curve number of 90 given the current <br />and anticipated pile expansion configuration. Please revise SWS2 for Structure #36 (Ditch F17), <br />SINS1 for Structure #8 (Ditch F5), and SWS1 for Structure #18 (Ditch F14) to a curve number of <br />90. <br />BOW2: The SWS for Ditch F -17 is correct. There is a small drainage area that is not coal mine <br />waste flowing into ditch F17 from the area in front (north) of the topsoil stockpile. The large <br />drainage area that is currently a CN =90 is from the Gob pile. The CN for Ditch 5 has been <br />changed to 90. Please see revised pages App. B -17 and 36. The curve number for Ditch 14 is <br />correct. It will receive flow from the gob pile, but it's drainage area is from undisturbed areas. <br />12. DRMS: On pages 19 and 20 of Appendix B, the Time of Concentration Details appear to <br />have a few minor errors in the slope information. Please verify and /or revise the Time of <br />Concentration Details for Structures #11 and #23. <br />BOW2: The SWS for Ditches F8 and the East Diversion Ditch (structures #11 and 23 <br />respectively) and have been revised. Please see revised pages App. B -19, 20, 40 and 61. <br />13. DRMS: The Structure Summary table from the Sedcad run for the 100 -yr event was not <br />included in the submittal. Please provide the Structure Summary table so that we can verify <br />the discharge values used to size the ditches and culverts. <br />BOW2: Please see new pages 26. <br />14. DRMS: The Structure Detail output page from the Sedcad run for West Diversion #1 was <br />not included in the submittal. Please provide design information for West Diversion #1. <br />BOW2: Please see the Structural detail output page for West Diversion Ditch #1 on page App. <br />B -58. <br />15. DRMS: Page App. B -2: <br />a. Please revise the table consistent with the design information provided for Culvert C -F4 <br />(should be a 30" culvert.) <br />b. The design information submitted for Ditch F16 indicates that the ditch will be triangular, <br />but it is listed as trapezoidal on page App. B -2. Please verify which is correct and make the <br />appropriate revisions for consistency. <br />