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Response to DRMS Adequacy Review (4) — Cotter LP -21 Mine Reclamation Plan Amendment <br />12. Please stamp and sign all five drawings pursuant to Rule 6.4.21(10)(a). <br />All drawings will be sealed for the submittal of these responses. <br />13. Sheets I and 2, Future Onsite & Offsite Basins /Proposed Drainage Improvements: <br />a. Please label all engineered channels, ditches and berms consistent with supporting <br />stability and capacity analyses. <br />Channels and berms have been labeled consistent with the supporting <br />analyses worksheets. <br />b. On Sheet 1, there is " *NOTE" shown in subbasins ON 30 and ON 40 referring to <br />TC flow paths on Sheet 2, but no TC flow paths are shown on Sheet 2. Please <br />show the TC flow paths on Sheet 2. <br />Onsite Basin 30 and 40 flow paths are now shown on the revised sheet 2 <br />included in Attachment 8. <br />c. Sheet 2. The DRMS assumes the dark cobble - shaded linear structure on Sheet 2 is <br />the proposed retention berm (Section B -B on Sheet 3). Please label this structure <br />and reference the Section B -B on Sheet 3. <br />The retention berm and section B -B are the same and are labeled similarly <br />on the relevant sheets in Attachment 8. <br />d. Sheet 2. There are three areas associated with the east proposed retention <br />berm that appear to be low spots (indicated below) that could retain <br />stormwater and overtop the proposed berm (note the intermediate contours <br />do not show up on the scanned image below): <br />o <br />._. <br />% <br />� w <br />ce <br />% Q <br />a <br />Please address this poten t ial and address the grading plan appropriately. <br />The berm has been noted to be graded to drain to avoid low spots which <br />could retain water. It has been aligned on the plan with contours showing <br />