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should be of minimal significance. Contour ripping, mulching and revegetation have been <br />'1 <br />demonstrated to minimize soil erosion and will be used to mitigate the increased runoff potential until <br />• the topsoil structure is developed. <br />Effects of sediment porxls on d~annel draracteristicsanct dannistream users. Potential impacts of <br />sediment pond 007 on downstream users v~ill involve possible reductions inflow due to impounded <br />water. The water augmentation plan discusses the available water which will be used should <br />impacts be identified. WFC currently has rights to a sufficient quantity of water to supply all users <br />associated with the mining activities, plus an additional quantity of water that can be used to mitigate <br />any impact to downstream users. <br />Effects of sediment pond discharge on surface wafter qual'rtX The effects of sediment pond <br />diversions on surface water quality wrill be negligible because the structure has been designed to <br />minimize impacts to the hydrologic balance. The diversion involves such minor areas of disturbance <br />that chemical and sediment changes in the flows v~ill be unmeasurable. <br />Effects of runoff from rodaimed areas on the quality of streamflow Due to the relatively small area <br />>> <br />i ~j of disturbance in the New Horizon 2 mining area, any reductions in runoffv~ill have only a minimal <br />• impact on streamflow quantity, as flow in Calamity Draw is dominated by irrigation return flow. <br />Decreased sediment loads predicated by SEDCAD+ indicate that reclamation efforts conducted in <br />the mining area wrill ensure that additional contributions of suspended sediment in runoff from <br />reclaimed areas v~ill not occur. Effects of runoff from reclaimed areas on the quality of streamflow. <br />Based on past operating history at the Nucla Mine, no significant trend toward higher concentrations <br />of the selected parameters have been detected. In addition, the pond discharge will be monitored <br />in accordance v~ith NPDES discharge limitations and any potential impact will be identified. <br />Therefore, runoff from the reclaimed area should have no significant impact over time on the quality <br />of receiving stream water quality. As a result, post mining land uses which currently occur in the <br />area should not be affected due to the mine plan which has been approved. <br />Summary The discussion presented herein of the probable hydrologic consequences of the revised <br />mine plan approved by WFC identifies the potential effects of mining. Table 2.05.6(3)-1 summarizes <br />the discussion by listing the probable hydrologic consequences and the results of the analysis of <br />each. As can be seen, all of the probable impacts have been determined to be of a short term <br />,~ (Revised ¢sss~ 2.04.7-46 <br /> <br />..:a~. <br />