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<br />P.mpoed HrrboGgsol Monirwinr Yfm, for Ae New Hor:mn Mine Z <br />of water to supply all users associated with the mining activities, plus an additional quantity <br />of water that can be used to mitigate any impact to downstream ttsers. <br />Effects of sediment pond disch ~e on surface water quality. The effects of sediment pond <br />diversions on surface water quality wHl be negligible because the stmcmre has been designed <br />to m;nim;ve impacts to the hydrologic balance. The diversion involves such minor areas of <br />disturbance that chemical and sediment changes in flte flows wID be unmeazurable. <br />Effects of runoff from reclaimed ateaz on the qualiri of streamflow Due to the relatively <br />small area of disturbance in the New Horizon 2 mining area, any reductions in runoff wt71 <br />have only a minimal impact on streamflow quantity, as flaw in Calamity Draw is dominated <br />by irrigation return flow. Decreased sediment loads predicated by SEDCAD+ indicate that <br />reclamation efforts conducted in the mining area vn71 ettsure that additional conmbutions <br />of suspended sediment in runoff from reclaimed areas will not oaur. <br />Effects of nmoff from reclaimed areas on the quality of streamflow. Based on past <br />operating history at the Nucla Mine, no significant hcnd toward higher coacent[ations of the <br />selected parameters have been detected. In addition, the pond discharge vall be monitored <br />in accordance with NPDFS discharge limitations and any potential impact will be identified. <br />• Therefore, runoff from the reclaimed area should have no significant impact over time on <br />the quality of receiving stream water quahry. As a result, post mining land uses whIclt <br />currently occur in the area should not be affected due to the mine plan which has been <br />proposed <br />Summary. The discussion presented herein of the probable hydrologic consequences of the <br />revised mine plan proposed by WPC identifies the potential effects of mining. Table <br />2.05.6(3)-1 summarizes Ute dscussion by listing the probable hydrologic consequences and <br />the results of the analysis of each, As can be seen, all of the probable impacts have been <br />determined to be of a short term nature, of minimal significance, or a plan has been <br />presented to mitigate those determined to have some significance. As a result, mining and <br />post mining affects to current land uses should be neghgtble. <br />Recommended Hydrological Monitoring Plan <br />Western Fuels recommendations for the new monitoring plan include the elimination of <br />several surface water stations, and the addition of others. Groundwater will also be <br />monitored through a select set of e~dsting wells and installation of new wells. Map 2047-1 <br />shows the locations of surface stations and wells for the New Horizon Mine 2 mottitoring <br />program. Modifications m the etdsting monitoring Locations for surface and groundwater are <br />discussed below. All data will be reported in the annual hydrology report. <br />12 <br />• <br />Attachment 2.04.7-5-36 <br />