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Fifth Adequacy Letter, Amended CN -01 <br />May Day Idaho Mine Complex, M- 1981 -185 <br />• Figure F -5A, Chief Portal Little Deadwood Gulch Reclamation Topography, <br />indicates a 25 foot highwall at 0.8H:1V, which is in conflict with the 2H:1V permit <br />condition imposed in Exhibit 6.5. <br />Please correct the above listed maps to support and clarify the reclamation plan. <br />6. Design specifications, certified by a licensed professional engineer, are required for all <br />Environmental Protection Facilities under Rule 6.4.21(10), including the redundant <br />containment measures required under Rule 6.4.21(7)(a). The Division has clarified that <br />designs were required for the following structures: <br />• Mill building <br />• Storage sheds, including Zircon or large shipping containers, in which designated <br />chemicals are stored or utilized <br />• Location of dewatering of tailings <br />• Pipelines for tailings and recycled process water <br />• Recycled process water storage tanks <br />• Tailings disposal and /or storage locations <br />• Sump or pit to contain leachate from stacked tailings <br />The Applicant submitted design specifications certified by a licensed professional <br />engineer for two of the four Zircon units indentified as Environmental Protection <br />Facilities. The Applicant did not provide the specifications required by Rules 6.4.21(10) <br />and 6.4.21(7)(a) for the mill building, two of the four Zircon units, tailings dewatering <br />location, pipelines for transport of tailings and recycled process fluids, storage tanks for <br />recycled process fluids, and the tailings disposal location. <br />Please address the requirements of Rules 6.4.21(10) and 6.4.21(7). <br />7. Pursuant to paragraph (3)(b) of the Joint Stipulation, approved and signed by the Mined <br />Land Reclamation Board on July 28, 2010, ground and surface water quality data <br />required under Rules 6.4.20(9) and (11) shall be collected subsequent to permit <br />issuance. The parties agreed that mining may not commence until the Applicant <br />submits appropriate and adequate hydrologic information to the Division and the <br />Division approves the information as a permit modification. Paragraph (3)(b) of the <br />Joint Stipulation clarifies that limited mining activities, which will not affect surface or <br />ground water quality, may occur subject to the Division's approval. <br />NOTE: Subsequent to the signing of the Joint Stipulation and prior to the filing of CN -01, <br />the Rules were updated and the reference to Rule 6.4.20(9) and (11) in the Joint <br />Stipulation now refer to Rules 6.4.21(9) and (11). <br />a. The Division had determined some of the proposed mining activities pose minimal <br />potential to affect surface or ground water quality. Such activities may commence <br />after the issuance of CN -01 and prior to the Division's approval of adequate <br />5 <br />