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MountRoyaleVenturesCashMineHydrology AdrianBrown <br />5.2 IVIRV Response <br />5.2.1 Hydraulic Seal <br />Hydraulic sealing of the Cash Mine following completion of mining will be achieved as follows: <br />1. Installation of a single mine seal in the Mount Royale Adit No 1 (#3 Level) at a distance of <br />approximately 300 feet from the. portal (Figure 3). The mine seal will generally conform to the <br />design of Allan Sorenson, of DRMS. <br />2. Performance of supplemental measures to eliminate surface seepage from the sealed mine, if <br />necessary, including formation or contact grouting, or backfilling of mine portal areas. <br />5.2.2 Groundwater Conditions after Closure <br />Following closure, the mine water level will recharge to an elevation estimated to be equal to the <br />elevation of the #3 Level. The maximum outflow from the mine after closure and re-equilibration of <br />water level in the mine can be computed from the current mine inflow, as follows: <br />Current maximum mine inflow: 1.56 gpm <br />Current drawdown at mine: 350 feet <br />Maximum post-closure drawdown (to #1 Level): 115 feet <br />Projected max post-closure seepage: 0.5 gpm <br />This result is supported by the modeling results, which predicts a maximum seepage from the entire <br />mine of 0.6 gpm. Based on this projection, there will be no point source discharge visible through the <br />reclaimed mine portals, and any seepage will be dispersed over the plug and the portal area to support <br />plant growth and groundwater recharge. No point source discharge will occur, and no NPDES discharge <br />permit will be required. <br />6. ZERO DISCHARGE, UIC CONSIDERATIONS <br />6.1 DRMS Request <br />6. 3.3 EXHIBIT C - Mining Plan, Section 17. Re: Zero discharge status and UIC permit considerations. <br />The Division respects the position of MRV on the need for an EPA -UIC Permit in order to conduct the <br />proposed mining operations. Ultimately, the need (or lack of need) for an EPA-UIC Permit should be <br />left to the discretion of the EPA. The Division will be forwarding MR V's proposed mining activities to <br />the EPA for their determination. <br />6.2 MRV Response <br />6.2.1 Zero Discharge <br />The current Cash Mine plan contemplates zero discharge of mine water. All water obtained from <br />dewatering the mine will be either used in the mining operation (including backfilling), or pumped to the <br />tailings pond for use in milling. <br />1601A-20060911 6