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Discharge from Outfall 001A <br />Analyte <br />2010 Avg <br />2000 -2005 Avg <br />Flow (gpm) <br />26.7 <br />22.3 <br />pH <br />8 <br />7.93 <br />Conductivity <br />2027 <br />1926 <br />TDS (mg/1) <br />1419 <br />1360 <br />Iron (mg/1) <br />0.03 <br />0.055 <br />Minrec has also provided upstream and downstream water quality data for the North <br />Thompson Creek. The data shows slight decreases in the downstream concentrations of <br />TDS, As, Cu, Fe and Zn and a slight increase in the downstream concentration of B. The <br />probable hydrologic consequences for the discharge predicted a very slight impact on the <br />North Thompson Creek due to an increase in TDS of approximately 3 %. Based on the <br />data presented in the 2010 Annual Hydrology Report and the fact that the discharge from <br />outfall 001A is now directed into the refuse pile sediment pond and sediment pond P -9, <br />the Division agrees that there will be minimal impacts to the North Thompson Creek. <br />Based on the Division's review of the 2010 Annual Hydrology Report for the North <br />Thompson Creek Mines the Division has the following question. <br />1. Since May 2010 the discharge from Treatment Pond T -2 has been rerouted from <br />outfall 001A (into the North Thompson Creek) and into sediment pond P -9 and <br />the refuse pile pond. This rerouting of water is approved as part of the developed <br />water resource approved for the North Thompson Creek Mines. To date, based <br />on the Division's quarterly site inspections, the water levels in the ponds has been <br />well below the pond spillways. There is, however, a possibility that the ponds <br />will fill with water and discharge. A discharge from either of these ponds would <br />be from a non - approved location. Please describe how Minrec monitors the <br />water flowing into sediment pond P -9 and the refuse pile pond and what <br />measures will be taken if the water level in these ponds approaches the pond <br />spillways. <br />This concludes the Division's review of the 2010 Annual Hydrology Report for the North <br />Thompson Creek Mines. Please contact me at (303) 866 -3567 X8145 if you have any <br />questions. <br />Sincerely, <br />James R Star <br />Environmental Protection Specialist <br />cc: Sandy Brown <br />