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AW -2 and AW -15 were dry or damp during all baseline monitoring events. <br />The average conductivity at the upstream North Fork of the Gunnison River <br />monitoring station for the baseline period (2012 AHR) is 167 umhos/cm. The <br />following table presents the estimated affect the coal pile and gob pile <br />leachate will have on the quality of water in the North Fork of the Gunnison <br />River at low flow: <br />rriu worn rorK or me <br />AW -4 <br />AW -5 <br />AW -6 <br />AW -11 <br />AW -12 <br />AW -16 <br />AW -17 <br />Min <br />5300 <br />4700 <br />4600 <br />390 <br />490 <br />740 <br />200 <br />Max <br />5700 <br />6200 <br />4700 <br />1060 <br />610 <br />740 <br />320 <br />Average <br />5500 <br />5450 <br />4650 <br />760 <br />567 <br />740 <br />264 <br />Gob Pile Leachate <br />3750 <br />3750 <br />3750 <br />3750 <br />3750 <br />3750 <br />3750 <br />AW -2 and AW -15 were dry or damp during all baseline monitoring events. <br />The average conductivity at the upstream North Fork of the Gunnison River <br />monitoring station for the baseline period (2012 AHR) is 167 umhos/cm. The <br />following table presents the estimated affect the coal pile and gob pile <br />leachate will have on the quality of water in the North Fork of the Gunnison <br />River at low flow: <br />rriu worn rorK or me <br />uunnison <br />raver <br />Flow gpm <br />Flow (cfs) <br />Conductivity <br />(umhos/cm) <br />North Fork <br />11,220 <br />25.00 <br />167 <br />Gob Leachate Discharge <br />4.9 <br />0.0165 <br />3750 <br />Coal Pile Leachate <br />0.4 <br />0.00156 <br />5205 <br />Combined Flow <br />11,225.3 <br />25.0118 <br />168.7 <br />Based on a combined 5.3 gallon per minute flow rate through the coal <br />stockpile and gob pile, the potential impact to the North Fork of the Gunnison <br />River that may result from alluvial ground water migration is minimal as <br />shown above. The conductivity of the alluvial well water is greater than the <br />predicted leachate that could impact the wells except for, AW -11, AW -12, <br />AW -16 and AW -17. <br />The predicted gob pile leachate, based on AW -15, AW -16 and AW -17 has <br />average total recoverable iron concentrations of 2.52,10.08 and 2.17 ppm <br />and average total recoverable manganese concentration 0.412, 1.126 and <br />0.123 ppm respectively. (2012 AHR). This equates an average iron <br />concentration of 4.92 and manganese concentration of 1.66. <br />PR -14 2.05-119 03/14 <br />