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Response to DRMS Adequacy Review (1) — Cotter JD -9 Mine Reclamation Plan Amendment <br />confirm whether there is a consistent increase in the concentration of the <br />constituent(s) of concern. If it is confirmed that the concentration of the <br />constituent of concern has increased above the levels indicated above, Cotter <br />proposes to initiate bio-remediation of the mine water to change the <br />oxidation /reduction potential of the mine water in an effort to cause the heavy <br />metals in the mine water to drop out of solution. <br />From: Dustin Czanla <br />Geostability Exhibit <br />1. The mining and reclamation plans, and the geotechnical stability exhibit discuss the <br />waste rock pile slopes being reclaimed to 2H. I V. The Reclamation Plan map shows final <br />slopes of 1.8H. I V. The applicant should clarify the anticipated maximum steepness for <br />the reclaimed slopes and correct the map(s) and/or exhibits as necessary so that they are <br />consistent. <br />A 2H:1V waste rock pile slope will be constructed during reclamation. Revised <br />reclamation plan maps are included as Attachment 4. <br />2. The applicant should provide two cross - sections of the waste rock pile area, one <br />oriented north south and another oriented east -west. The cross - sections should illustrate <br />details down to the material underlying the waste rock pile, and should show the current <br />slope configuration as well as the proposed reclamation slope configuration including <br />the anticipated maximum thickness of the waste rock pile. Details of the cross - sections <br />should extend at least fifty feet horizontally beyond the extent of the waste rock pile on <br />both the upslope and down slope sides. <br />The requested cross - sections (Figure C5) are provided as Attachment 5. <br />14 <br />