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Considerations for feasibility and <br />Co 8.1.4 Evaluate waste rock management options <br />101 <br />A geochemical evaluation of the spoil material that will be generated at the Collom Mine <br />should be conducted at the feasibility level. This evaluation was originally scoped for the <br />pre - feasibility study but was later delayed until feasibility. Some geochemical data exist <br />from previous exploration programs in the Collom study area. However, an additional <br />sampling program should be designed and implemented during the feasibility study to <br />collect samples that will be representative of the final geology of the mine dump and the <br />reclaimed mine pit. Results would be used to develop plans for managing spoils during <br />mining and closure, and to evaluate the water quality that may result if mine spoils are <br />re- saturated. These data will be a key aspect of the permitting documentation and <br />analysis that will be needed for Collom. <br />8.2 Permitting considerations <br />Baseline hydrologic monitoring initiated during the pre - feasibility study included surface <br />water characterization, spring and seep surveys, and groundwater characterization. <br />Baseline monitoring activities are listed in the Sampling and Analysis Plan and will be <br />continued until a sufficient baseline is established. The permit application will also <br />require evaluation of potential hydrologic consequences of mining including potential <br />impacts to surface water and groundwater. Activities that should be considered are <br />discussed below. <br />C 8.2.1 Regional groundwater model <br />0 <br />The mine permit will require an assessment of the potential hydrologic consequences of <br />mining. A three - dimensional groundwater model of the Collom area and surrounding <br />region is planned to facilitate and support this evaluation of impacts. The model can be <br />used to determine long -term impacts from groundwater extraction on the regional <br />groundwater flow regime and evaluate post- mining impacts. Work on developing the <br />regional model was initiated during the pre - feasibility study and should continue so that it <br />is available for use for permitting and feasibility. <br />8.2.2 Ongoing baseline monitoring <br />Baseline monitoring should continue to obtain at least 12 months of data. Activities <br />include: <br />Surface water — Complete the installation of flumes at the selected surface <br />water stations. Continue monthly flow measurement and water quality <br />sampling. <br />Valley fill groundwater — Continue monthly water level measurements and <br />groundwater sampling (KEC is conducting monthly sampling, minimum <br />sampling should be quarterly). <br />2572 -R2 <br />Colowyo Coal Company <br />Water Management Consultants <br />