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Third Adequacy Letter, Amended CN-01 I 7 <br />May Day Idaho Mine Complex <br />The Division has enclosed three maps of the underground workings, which might assist <br />the Applicant in identifying specific locations for disposal of mill tailings, waste rock, and <br />debris from the dismantled mill facility. Please submit underground mine maps, labeling <br />all locations proposed for underground disposal of waste rock, mill tailings, and debris <br />from the dismantled mill facility. <br />Exhibit D - Mining Plan, Rule 6.4.4 <br />14. In the preliminary adequacy letter for CN-01, dated March 15, 2011, the Division <br />referenced a Joint Stipulation, which was approved and signed by the Mined Land <br />Reclamation Board on July.28, 2010. Pursuant to paragraph (3)(b) of the Joint <br />Stipulation, ground and surface water quality data required under Rules 6.4.20(9) and <br />(11) (new Rules 6.4.21(9) and 6.4.21(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 />a. The Division has 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 />hydrologic information for surface and ground water. These activities are limited to <br />the following: <br />• Stabilization and reconstruction of illegal access road from County Road 124 <br />to bridge; <br />• Grading of pre-existing access roads; <br />• Installation of storm water management structures; <br />• Excavation of the collapsed portal at May Day 1 level and establishment of a <br />stable highwall and mine bench at the May Day 1 level; <br />• Removal of soil, rock and mining related debris from the drainage channel of <br />Little Deadwood Gulch at the Chief Portal and May Day 2 level; and <br />• Corrective measures as necessary to comply with enforcement actions issued <br />by other agencies, with written approval from the Division. <br />b. The Division has determined some of the proposed mining activities pose significant <br />potential to affect surface or ground water quality. Such activities may not <br />commence until the Division receives and approves hydrologic information adequate <br />to fully characterize baseline conditions for surface and ground water, and a <br />hydrologic monitoring plan sufficient to verify compliance with water quality <br />regulations. These activities, which cannot commence until hydrologic baseline <br />conditions have been approved by the Division through a permit modification, <br />include the following: