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100 Considerations for feasibility and permitting <br />l <br />increased inflow. If the burn zones are in connection with the valley fill groundwater in <br />the major stream valleys, they may provide a pathway for valley fill groundwater flow into <br />the pit. During the 2005 drilling program, the following activities are recommended: <br />• Identify holes that will intersect the burn zone. <br />• Collect hydrologic data during drilling in these holes including water levels <br />and water production rates. <br />• Conduct flow meter logging using the EM flow meter (if feasible based on <br />hole conditions). <br />• Install standpipe piezometers in several holes to determine water levels <br />conditions in the burn zones and to allow hydraulic testing. <br />• Conduct single -hole hydraulic tests in the burn zone. <br />• Determine areas of the proposed pit that may intersect burn zones and <br />evaluate whether additional dewatering measures are needed. <br />8.1.2 Hydrogeological conditions in areas outside of the Collom footprint <br />The pre - feasibility study focused on the hydrogeology in the Collom footprint area. <br />However, it is our understanding that some coal deposits outside of this footprint may be <br />C considered as targets for mining. As these areas are explored with drillholes, we <br />recommend that piezometers be installed on an opportunistic basis to start collecting <br />hydrogeological information that could be relevant to mining. We suggest using <br />standpipe piezometers since they will allow hydraulic testing to be conducted in the hole. <br />If specific areas of interest are encountered during explorations drilling, such as areas of <br />geologic structures or high inflow, then the EM flow meter logging should be considered. <br />This will provide scoping -level permeability data to be obtained at relatively low cost. <br />8.1.3 Refine the mine dewatering /slope depressurization system design <br />The pre - feasibility level dewatering design is based on the preliminary mine plans. As <br />the mine plan is changed during feasibility, changes to the dewatering system may be <br />required to refine the system and optimize its performance and cost. It is important that <br />the feasibility level dewatering system be tailored to the specific mine plan and pit <br />slopes. <br />A regional -scale groundwater model is being developed of the Collom study area. This <br />model will be used to evaluate potential hydrologic impacts during mining and closure. It <br />can also be used as a tool to evaluate the feasibility level dewatering /depressurization <br />program and to optimize the system design. <br />• <br />2572 -R2 Colowyo Coal Company <br />Water Management Consultants <br />