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2.05.6 <br /> AW-1 AW-2 AW-3 <br />Min 8900 1075 3600 <br />Max 9300 9700 3600 <br />Average 9100 5344 3600 <br />Coal Pile Leachate 505 505 505 <br /> AW-4 AW-5 AW-6 AW-16 AW-17 <br />Min 2900 3100 3300 740 200 <br />Max 5300 6800 5600 740 272 <br />Average 3786 5464 4555 740 236 <br />Gob Pile Leachate 1190 1190 1190 1190 1190 <br />AW-15 has been dry during all monitoring events. <br />Based on a combined 39.1 gallon per minute flow rate through the coal stockpile and <br />gob pile, the potential impact to the North Fork of the Gunnison River that may result <br />• from alluvial ground water migration should be minimal. The conductivity of the <br />alluvial well water is greater than the predicted leachate that could impact the wells <br />exceptforAW-16and AW-17. The predicted gob pile leachate, based on the Upper <br />B-Seam roof and floor analyses presented in Volume III, Tab 6, has an average iron <br />concentration of 26.8 ppm and average manganese concentration of 1.9 ppm. The <br />predicted coal pile leachate based on the Upper B-Seam Coal analyses presented in <br />Volume III, lab 6, has an average iron concentration of 8.6 ppm iron and average <br />manganese concentration of 0.1 ppm. The iron and manganese baseline values for <br />the river are obtained from the Bowie No. 2 Mine, 2006 annual hydrologic report, <br />average from lower monitoring point. The following table presents the impact gob <br />pile leachate and coal pile would have if it flowed into the river at the rate of 34.4 and <br />4.7 gallons per minute respectively. <br />TR-44 <br />Predicted based on conductivity measurement from an Upper B-Seam coal sample. <br />Predicted based on conductivity measurements from Upper B-Seam samples of roof, <br />floor and interburden. <br />2.05 - 75 <br />12/06 <br />APPRavcD <br />3/in/o 7 <br />