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-4- <br />pond separated from the main pond in the footprint excavation area. The <br />sediment pond will be located in the north end of the excavation footprint <br />adjacent to the buffer zone and ditch inlet. Water being pumped to the <br />sediment pond would be able to recharge immediately to the inlet/river via <br />groundwater. Groundwater drawdown into the inlet and river and Deep Cut <br />Ditch would have to intercept and dewater the sediment pond before it could <br />affect the groundwater elevations or base flow of those adjacent channels <br />and/or alluvial materials. <br />• There will be no losses to any adjudicated ditch water from the river <br />because the pumped ground water will eventually go to the inlet/river <br />or the sediment pond adjacent to the ditch inlet. The District Water <br />Commissioner can request mitigation should she determine that water <br />is being lost from the ditch due to pumping. Please Note: The Deep <br />Cut Ditch is supplied by the river via the inlet, so the dewatering <br />would have to drawdown the whole Yampa River (300 feet away) to an <br />elevation well below the base elevation of the ditch head-gate to affect <br />the ditch. <br />• There is no significant vegetation that will be damaged, the pasture has <br />thin topsoil is currently low yielding and has no irrigation water <br />allotment or assignment. The small cottonwood tree grove will be <br />protected during excavation operations by a distance sufficient so <br />that tree roots are not encountered damaged or exposed. <br />• The small wetland areas have been delineated and will be enhanced <br />and not degraded. Some groundwater could also be directed to the <br />wetlands for recharge if the wetlands are affected. <br />• Pit dewatering activities would be done as necessary for the mining to <br />proceed north to south. By pumping to the sediment pond or directly to <br />the inlet/river the cone of depression could be to the base of gravel <br />body (20+ feet BGL) and extend to approximately 100 feet beyond the <br />pond invert edge (the excavated static water surface). <br />5. The fact that the Stormwater Permit will be modified in the future so that <br />dewatering waters can be discharged to the river (actually to the Deep Cup <br />Ditch Inlet) should eliminate any "theoretical groundwater drawdown effect" <br />concerns to the ditch and/or inlet and subsequent loss of water from the ditch. <br />Please contact me if you have any additio3Timothy], mments or questions a (719) 655-2709. <br />Thank you. Regards, <br />., e arilon <br />Ge st