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Janet Binns -3- April 20, 2019 <br />area of 37.2 acres and a runoff of 2.15 ac -ft. The biggest difference for the runoff is a <br />reduction in the amount of coal mine waste, which has a curve number of 90, and <br />reduction in runoff from a disturbed area which has a curve number of 74. The runoff <br />area is correctly shown as 37 -acres on page Volume XI, page 5. <br />g) DRMS: Page 7 references structures to be built in the future. However, these <br />structures already exist on the ground since they were approved in previous <br />revisions. Please update the text and/or reference the as -built for the rock drain <br />and East sub -drain. <br />BRL: References to the West sub -drainage system were updated to reflect on the <br />ground conditions, please see Volume XI, pages 6 & 7. The East subdrain has not <br />been constructed yet and therefore no changes were made to that section. <br />h) DRMS: Paragraph 4, page 9, discusses a future borrow area to be created. In <br />2019, this borrow area already exists, as previously approved. Please update the <br />text to reflect current conditions. <br />BRL: Please see revised Volume XI, page 9. <br />2) DRMS: Please update map 32, as appropriate. <br />BRL: Map 32 has been revised, and now excludes replacing topsoil to the Topsoil Stockpile F/F1 <br />area. This area will not have additional topsoil placed on it, it will be ripped and seeded during <br />reclamation. In addition, Appendix A has been revised to reflect the current the amount of <br />material in both the coverfill and topsoil stockpiles. A new line was added for topsoil to be <br />placed on areas associated with the gob pile, but not on the gob pile, and therefore the <br />replacement depths for those areas is just 6". Appendix A was also updated to remove most <br />"to be salavaged" text and now shows just amounts actually in stockpile, or what coverfill still <br />remains to be salvaged from the East drying area footprint. <br />For simplicity, all of the Volume XI text pages are included. Please let me know if you have any <br />additional questions. <br />Sincerely, <br />Ta•vww�.e� 13i.S-&o <br />Tamme Bishop, P.E. <br />Project Engineer <br />Cc: Basil Bear <br />Attachments: <br />Volume XI, text pages, Map -32 <br />