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Twentymile Coal, LLC. <br />Page 2 <br />November 16th 2018 <br />sediments will be disposed of. This information would be appropriately placed on proposed <br />revised page 2.05-84.5. Addressed with 11/13/2018 submission <br />5. Page 2.05-45.28 to 45.29, indicates that once discharge operations cease the man-made discharge <br />structures will be removed and modification of the cell embankments will be made to provide <br />flow-through with the cells and associated ponded areas and wetlands remaining. Please modify <br />this language to indicate the passive water treatment system will be reclaimed in accordance with <br />the approved reclamation plan discussed in section 2.05.4 of the permit. Adequacy issues <br />pertaining to the currently proposed reclamation plan are discussed in section 2.05.4 of this letter. <br />Addressed with 11/13/2018 submission <br />6. The "Mine Water Discharge and Recycle System" section on proposed page 2.05-50 and the <br />"Fish Creek Dewatering Boreholes, Treatment Systems, and Transfer Pipeline" sections were <br />recently revised with MR299. These revisions were not included in the proposed revised section. <br />Please update these pages to include the revisions made with MR299. <br />Please ensure updates from all approved revisions prior to the next response are <br />included in updated pages. <br />7. Proposed revised page 2.05-50.10 does not appear to take into account the approval of MR299, <br />the proposed revised text does not follow with the preceding page. Please review these pages and <br />revise the most recently approved permit text and insure they follow the preceding and <br />subsequent text and pagination. <br />Please ensure updates from all approved revisions prior to the next response are <br />included in updated pages. <br />8. The design information for the passive water treatment system contained in Exhibit 49EE must be <br />certified by a qualified registered professional engineer experienced in the design and <br />construction of impoundments per Rule 2.05.3(4)(a)(ii)(A). Please submit documentation to be <br />included in the proposed Exhibit that these designs are certified per the cited rule. <br />Addressed with 11/13/2018 submission <br />9. The current design information for the 6MN Reservoir is contained in Exhibit 8CC of the permit. <br />Please update this exhibit to indicate that the design of the Reservoir has been updated with TR - <br />84 to include a spillway to facility discharge from the passive water treatment system. Please cite <br />where the modified design can be found in the permit. No longer applicable to this revision as <br />discharge is not being proposed. <br />10. The current 6MN Reservoir is designed as a closed system and the "upper diversion ditch" was <br />designed to divert 13.16 acre-feet of runoff from a 119.09 acre area around the reservoir based on <br />a 100 year -24 hour storm event. Now it appears a large portion of this 119.09 acre area watershed <br />will be diverted directly into the 6MN Reservoir with the south and north diversion ditch around <br />