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May Day Idaho Mine Complex 112 (d) Permit Application <br />• <br />(b) Groundwater Quality Data <br />No groundwater wells are located within the permit area. As such, no groundwater <br />quality data has been collected to date. A groundwater quality monitoring plan is <br />presented in Section 6.4.20(19). The Division has agreed that a 112(d) permit may be <br />issued, if all of the requirements of the Act are met, prior to completion of five successive <br />calendar quarters of groundwater sampling, with appropriate limitations on mining <br />activities which might potentially impact groundwater pending completion of all five <br />quarters of sampling. <br />(c) Detection Limits <br />Analytical detection limits and groundwater parameters are discussed in Section <br />6.4.20(12). <br />6.4.20(10) Surface Water Control and Containment Facilities Information <br />(a) Design Specifications <br />• <br />(i) Designated Chemical Storage <br />All chemicals, with the exception of the potassium amyl xanthate, will be stored <br />in a locked shipping container at the bench at May Day No. 1. <br />Potassium amyl xanthate will be stored within a separately locked above ground <br />storage unit. The storage unit will be sealed and bermed. <br />(ii) Surface Water Diversion <br />For areas where surface water in the form of stormwater may be present, surface <br />water diversions (BMPs) will be implemented as outlined in the Metal Mining <br />General Permit Stormwater Management Plan (SWMP) (Attachment T-4). No <br />surface water will be encountered underground where the milling activities will <br />occur. All chemicals planned for use will be used in very small quantities. <br />Additionally, berms will be put in place surrounding any locations where <br />chemicals are stored on site and where chemicals are used in the subsurface in <br />the mill. <br />(ii) Surface Water Diversion <br />Surface water diversion will occur through the implementation of BMPs <br />described in the Metal Mining General Permit Stormwater Management Plan <br />(SWMP). <br />(b) Storm Water Management Plan <br />• <br />A Metal Mining General Storm Water management Plan has been prepared for submittal <br />to the CDPHE. A copy of the plan is provided in Attachment T-4. <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />11