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Wesr Elk Mine <br />• <br />Table 52 <br />Summa of F Seam Mine Dischar a Water Quali Data <br /> Total dissolved Solids pH <br />Location <br /> Min. Max. Mean Min. Max. Mean <br />S Ivester Gulch Fan Site 264 2 220 511 6.8 8.0 7.7 <br />East Portal 354 724 547 7.2 8.2 7.6 <br />West Portal 328 2 088 1 029 8.0 8.2 8.1 <br />1 Total dissolved solids measured in 7986 and 1987. Total dissolved solids not measured before 1986, bui <br />calculated from measured conductivity. <br />s Re ortetl for ears 1984 and 1985. <br />It is beyond the scope of this permit application to predict the combination of dischazge rates and <br />river flow conditions that would occur during subsequent years; however, a "worst case" analysis <br />was conducted. The 7-day, 10-yeaz low flow of approximately 30 cfs was used for the North <br />Fork streamflow. Estimates of pond water discharges were based on the maximum capacity of <br />the underdrain systems. <br />The use of water for its designated uses will not be impaired by pond discharges. <br />Seepage From Waste Rock or Coal Refuse Piles <br />Infiltration and percolation of precipitation and runoff through waste rock piles can be a potential <br />source of dissolved solids and pollutants. Effects of seepage from waste rock piles on the North <br />• Fork were evaluated for the upper North fork watershed in the CHIA (2001). According to this <br />study, the chemistry of any leachate would likely be sodium sulfate water with low metals <br />concentrations and neutral pH. <br />A CDMG study determined that "the contribution of salts to leachate from existing and proposed <br />waste piles along the North Fork of the Gunnison River would be insignificant..." Furthermore, <br />the study found that impacts from seepage were probably over-estimated since most seepage <br />would result from snowmelt and occur during times of higher than average streamflows. <br />Discharge of Mine Water <br /> <br />Mine water can be discharged at several locations: Sylvester Gulch Fan site (NPDES outfall <br />011), Lone Pine Gulch (NPDES outfall 013), direct discharge to the MB-1 emergency spillway <br />or into pond MB-1 (NPDES outfall 016), the Sylvester Gulch pumping facility (NPDES outfall <br />017), and pond MB-2R (NPDES outfall 004). Discharged mine water ultimately ends up in the <br />North Fork. Table 52 shows a summary of F Seam mine water quality for dischazges from the <br />Sylvester Gulch fan site and water sent to MB-1 from the east (Portal No. 2) and west <br />2.05-l93 <br />Revised November 1004 PRIO <br />