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Name of Addressee <br />Page 2 <br />Date <br />discharge in the 2013 Annual Hydrology Report. Please provide data from the June <br />2013 sampling event on the No. I Mine discharge, or provide an explanation of why <br />the sampling was not conducted <br />4. Minrec, Inc. reports no discharge at Outfall 001, since there was no discharge directly to <br />North Thompson Creek. The October 17, 2012 (within 2012/2013 water year) Division <br />inspection report indicated that Pond P9 was discharging. Any discharge through the <br />Pond P9 spillway would constitute a discharge as soon as it crosses the permit boundary, <br />regardless of where the flow is directed after crossing the permit boundary. Rule <br />4.05.2(1) requires discharge from underground workings to meet the effluent limitations <br />of Rule 4.05.2 before leaving the permit area. Accordingly, Minrec, Inc. should be <br />recording and analyzing discharges from Outfall 001 in accordance with the approved <br />CDPS permit to demonstrate that the discharge is meeting the applicable effluent <br />limitations. <br />5. The water quality data provided for North Thompson Creek generally indicates little <br />change in water quality at the downstream point, below Outfall 001, when compared to <br />the upstream data. There are a couple of isolated incidents of constituents with elevated <br />values downstream (Arsenic (both total recoverable and potentially dissolved) <br />10/30/2013 and Iron (dissolved) 5/28/2013). The cause for these isolated incidents is <br />unclear and the Division will continue to monitor the water quality. <br />6. The 2013 report includes monitoring data from samples taken at the No. 1 Mine and No. <br />3 Mine discharges prior to passage through the passive water treatment system. The data <br />is from one monitoring event (08/21/2013) that did not coincide with the two monitoring <br />events on North Thompson Creek. It would be helpful if future sampling events would <br />coincide with the upstream and downstream monitoring of North Thompson Creek. <br />7. Monitoring results to date are generally in line with the predicted impacts to the <br />hydrologic balance summarized in the report and detailed in the approved permit <br />application package. <br />If you have any questions, please contact me. <br />Sincerely, <br />AaA--)L <br />Brock Bowles <br />Environmental Protection Specialist <br />