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Response to DRMS Adequacy Review (1) -Cotter SR -11 Mine Reclamation Plan Amendment <br />work with the Division in addressing steps to evaluate the prevailing <br />hydrological balance, which may include wells and a monitoring plan. <br />Exhibit U <br />12. Addressing Rule 6 4.21(6)(b)(iii), please describe how Cotter Crop, will prevent adverse <br />off -site impacts during periods of Temporary Cessation. <br />Current stormwater structures are in place to prevent adverse off -site <br />impacts. These structures will be inspected one to two times per month <br />during times of Temporary Cessation. Stormwater control structures will be <br />maintained as required during periods of Temporary Cessation. <br />13. Addressing Rule 6.4.21(7), the EPP states that a radiometric survey will be completed <br />prior to mining in order to document baseline conditions at the site. Baseline conditions <br />shall be established as part of this amendment process. Please conduct a radiometric <br />survey of the affected area and submit the results to the Division along with an <br />evaluation of the expected effectiveness of the proposed EPP, which specifically <br />addresses the risks, from uranium, uranium byproducts, and any other radionuclides <br />expected to be encountered during this operation, to human health, property and the <br />environment. <br />The baseline radiometric survey is included as Attachment 6. Cotter's <br />procedures for separating ore from waste rock are designed to minimize the <br />addition of uranium ore to the waste rock pile —an approach that makes <br />sense from an economic and environmental standpoint. The EPP addressed <br />several issues that evaluate the risks to human health and the <br />environment. The potential of acid mine drainage from the waste rock piles <br />was quantified by the SPLP tests, which indicated this was not an issue. The <br />hydrogeologic evaluation presented in the EPP showed that factors of low <br />precipitation, low permeability, and geochemical conditions restricted <br />potential leachate from the waste rock piles from impacting groundwater <br />resources. A detailed Drainage Design Plan (Appendix III in the EPP) routes <br />5 <br />