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TWENTYMILE COAL, LLC - FOIDEL CREEK MINE (C-1982-056) <br />TR16-84, 6MN PASSIVE WATER TREATMENT SYSTEM <br />TECHNICAL ADEQUACY RESPONSES 12/18 <br />Items from 1st Adequacy Review Letter <br />Table of Contents <br />1. Please update proposed revised page xii to indicate that Exhibit 49EE also contains the designs <br />for the 9 -East Utility Borehole (MR296). Not yet addressed <br />Response: The referenced TOC page has been updated to reference the 9 -East Borehole design <br />information. Copies of the revised page accompany these responses for replacement in the PAP. <br />2. The Final Design Drawing Package submitted as Appendix C and Appendix I to proposed <br />Exhibit 49EE, contains many designs drawings that are often too small to read. Please submit <br />legible copies of the design drawings for the hard copy of the permit. Addressed with <br />11/13/2018 submission <br />3. Figures 4-6 and 4-7 of proposed Exhibit 49EE are difficult to read. Please submit a revised <br />page with legible figures for the hard copy of the permit. Addressed with 11/13/2018 <br />submission <br />4. Per Rule 2.05.3(4)(a)(ii) and Rule 4.05.6(3)(b), please describe how frequently the <br />sediments collected in the passive water treatment cells will be cleaned out. Please <br />describe where the sediments will be disposed of. This information would be appropriately <br />placed on proposed revised page 2.05-84.5. Addressed with 11/13/2018 submission <br />S. Page 2.05-45.28 to 45.29, indicates that once discharge operations cease the man-made <br />discharge structures will be removed and modification of the cell embankments will be made to <br />provide flow-through with the cells and associated ponded areas and wetlands remaining. <br />Please modem this language to indicate the passive water treatment system will be reclaimed <br />in accordance with the approved reclamation plan discussed in section 2.05.4 of the permit. <br />Adequacy issues pertaining to the currently proposed reclamation plan are discussed in <br />section 2.05.4 of this letter. Addressed with 11/13/2018 submission <br />6. The `Mine Water Discharge and Recycle System" section on proposed page 2.05-50 and <br />the "Fish Creek Dewatering Boreholes, Treatment Systems, and Transfer Pipeline" <br />sections were recently revised with MR299. These revisions were not included in the <br />proposed revised section. Please update these pages to include the revisions made <br />with MR299. Please ensure updates from all approved revisions prior to the next <br />response are included in updated pages. <br />Response: For the PAP pages revised for TR16-84, the CDRMS laserfiche files were checked for the latest <br />approved revisions, and the pages were updated, as appropriate. Copies of the revised pages accompany these <br />responses for replacement in the PAP. <br />