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U <br />na lF.~.hJ.gad 'J.m::^ Y.q>ar }(!nr_ <br />Efcca of sedime ~[ oonds nn channel ~iantc:eristics end dr>,vnsveam users. Pomn[ial <br />impaurs of sediment pond t)ll`. un downs;ream uses wiil invoivc possible reduc:ions in flow <br />due ro impounded water. The water auetnenm[ion plan discusses [he available warer which <br />will be used should impacu be identified. WFC currently has riy+hu to a satHcient quantity <br />of warer to supply all users assceiated with the mining ac:iviries. Pius an additional quantity <br />of water that can be used to mitigate any impact co downstream users. <br />Effects of sediment pond discharge an su~t'ace water quality. The effecu of sediment pond <br />diversions on surface water quality will be negligfole because [he structure has been designed <br />to minimize impacu to the hydrologic balance. The diveuion involves such minor areas of <br />disturbance eha[ chemical and sedimen[ changes in the tows will be unmeasurable. <br />Effects of runoff From reclaimed areas nn the quality of streamNow. Due to the relatively <br />small area of disturbance in the New Horizon 2 minine area. anv reductions in runoff will <br />have only a minimal impact an sueamtiow quantity, as flow is Calamity Draw is dominated <br />by irrigation return Bow. Decreased sedimcn[ loads predicted by SEDCADT indicate that <br />reclamation efforu conduced in the mining area will ensure that additional contributions <br />of suspended sediment is runoff from reclaimed areas will not occur. <br />i <br />• Effects of runoff from reclaimed areas on the ouality of streamt)ow. Based on past <br />operating history at [fie Nucla brine, no significant trend toward higher concentrations of the <br />selected parameters have been detected. In addition the pond discharge will be monitored <br />in accordance with NPDES discharge limitations and any potential impact w[71 be identified. <br />Therefore, mnaff from the reclaimed area should have no sigtificant impact over time on <br />the quality of receiving stream water quality. rls a recut[, post mining land uses which <br />currently occur in the area should not be effeaed due co the mice plan which has been <br />approved. <br />Summary, The discussion presented herein of the probable hydrologic consequences of the <br />revised mine plan approved by WFC identifies the potential effecu of mining. Table <br />2.05.6(3)-1 summarizes the discussion by listing :he probable hydrologic consequences and <br />the resulu of the analysis of each. rtis can be seen. all of the probable impacts have been <br />deu:mined to be of a shott term nature. of minimal significance, or a plan has been <br />presented to mitigate [hose determined ro have some significance. Ai a result. mining and <br />post mining affecu to current land uses should be neglig[ble. <br />' Recommended Hydrological Monitoring Plan <br />Western Fuels recommendations for the new monitoring plan include the elimination of <br />several surface warer stations. and the addition of oche:s. Groundwater will also be <br />monitored through a selec[ set of existine wells and instatlation of new wells. ~fap L04.7-t <br />t3 <br />• <br />Attachment 2.04.7-5-16 <br />