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Page 4 <br />11/17/2015 <br />Rule: 2.05.6 — Mitigation of the Impacts of Mining Operations <br />This section was reviewed for protection of the hydrological balance in reference to groundwater <br />and spoil springs. This rule was found to be adequatly described. A general list is provided below <br />to the sections of the permit reviewed for compliance: <br />Groundwater impact discussion: begining on page 2.05-130 <br />Groundwater Quantity protection : See above bullet in reference to Table 9 <br />Exhibit 13 Groundwater Model Documentation <br />Exhibit 31 Spoil Analysis <br />Exhibit 35 Backfill Hydrology Evaluation (From Eckman Park Mines) <br />Exhibit 36 Geochemical Analysis (roof and floor samples) <br />Exhibit 37 Water Test of Flooded Mine Workings <br />Exhibit 38 Estimation of Salt Load from Spoil Material Based on Drill Samples <br />Exhibit 39 Mine Inflow Estimates (finite difference model) <br />Exhibit 49 Calculation of Stream Loading from Mine Table E-49-1 Water Quality Anlayses <br />Probably Hydrologic Consequences discussion begins on page 2.05-131 <br />Effects on Groundwater Quality of Aquifers start on page 2.05-142 <br />Quantity and quality are discussed in relation to probably hydrologic consequence. <br />Leach testing shows solute Concentration will increase once mining is discontinued and workings <br />are flooded. Discharge of the plume of low quality water is estimated to take up to 500 years <br />based on recharge leach studies and poteniometric surface recovery. This is not expected to <br />significantly affect surface water quality due to amount of flow expected. This is not expected <br />impact the two regionally significant aquifers, the Twentymile sandstone and the Trout Creek <br />sandstone at currently predicted hydrologic communication. <br />Subsidence impacts are predicted to increase hydrologic communication between units, which <br />could impact the Trout Creek Sandstone if subsidence affects are great than anticipated given the <br />vicinity of a major fault zone. <br />Probable Hydrologic Consequences have been updated to include development activities for the <br />Wolf Creek Reserve. <br />