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Section 780.21(c) Continued. <br />tations described in Section 816.42, will ensure that the proposed <br />operations will not have an adverse effect on the sediment load of <br />streams draining the mine plan area. <br />Dissolved Salt Load <br />The construction of sediment and flow control facilities such as <br />sedimentation ponds and diversion ditches which detain water will <br />have the effect of increasing the concentration of total dissolved <br />solids in the water due to evaporation. Also, any water which will <br />be pumped or discharged by gravity flow from the pits to <br />sedimentation ponds and subsequently discharged to surface drainages <br />may contain relatively high levels of dissolved salts. Therefore. <br />the concentration of total dissolved salts, while difficult to <br />quantify, might increase in streams draining the mine property. As <br />shown in Table 14, Kerr Mine Area Surface Water Quality Data, the <br />average total dissolved solids content of affected surface waters <br />within the mine plan area is higher than the baseline concentration. <br />The sedimentation ponds in the mine plan area increase the total <br />surface area of water, and, hence, increase the evaporative loss and <br />average dissolved salt concentration of surface water discharged from <br />the mine plan area during mining and reclamation. Pumping may be <br />required to remove accumulated water in the mine pits. While the <br />dissolved salts concentration of this water and the amount to be <br />pumped at any one time cannot be accurately predicted from data <br />collected to date, the pumped water will contribute dissolved salts <br />to surface drainage during operations. This will be a temporary <br />effect which will be mitigated when mining and reclamation are <br />concluded and the required sedimentation ponds are removed. <br />C:...1830TR10.REV <br />osioz~s3 anm 780.125R Revised - September 1993 <br />