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Spoil Springs: Recorded 2015 spoil spring discharges (site 303-1) occurred in 2015. The 2012 reclamation at <br />the Fish Creek Tipple, resulted in the loss of two smaller associated springs in the 303 series (303-2 and 303-3) . <br />Thus, they did not constitute a significant portion of discharge from the TC mine area with the potential to impact <br />off-site areas. Discharges from sedimentation ponds predominately occurred in conformance with applicable <br />CDPS permit limitations and therefore did not constitute significant impacts to receiving waters. <br />Mine Discharge: Mine water discharge site 109 did not discharge to Foidel in 2015. In 2005, TC began <br />redirecting electro -coagulation treated mine water pumped from the Fish Creek Borehole well, underground <br />locations for dust control. Mine water from the Fish Creek Borehole well (which is treated by electro- <br />coagulation) can also be directed to discharge to Fish Creek via site 115. Site 115 discharged for a couple of <br />hours in 2015 due to a broken pipeline that was subsequently repaired. <br />The mine pump at IORT began discharging to Foidel in September 2008 under an emergency discharge permit <br />issued by CDPHE. In early 2009, TC experienced difficulties in consistently meeting WET and iron standards at <br />the pipeline discharge source. In the second quarter of 2009, TC halted all discharge at the discharge source <br />permited under the emergency discharge permit, and re -directed IORT dewatering to the Area # 1 Pit. The Pit <br />overflow goes via DRMS site 7 to Pond D, which may in turn flow into Foidel Creek via CDPS Outfall 005A <br />(a.k.a. site 84). As indicated earlier, future treatment of TORT (EMD) mine water is under consideration. <br />Mine Inflow: No unusual occurrences of inflow were noted as a result of the Annual Mine Inflow study. <br />Inflows are within the projected flows presented in the permit. Water quality has not changed significantly and <br />appears to mirror the quality of the adjacent spoil water. It appears that the elevated EC and iron readings seen in <br />2012 are associated with the water that has pooled in the mine sump, which is in contact with the overlying <br />Marine Shale. This contact has provided the opportunity for additional salts and iron to be leached from this unit. <br />The pumping of the sump should see a decrease in the elevation of the pool over time, with an anticipated <br />decrease in the EC and concentration of iron in the effluent. <br />Subsidence: During 2015, no ponds or surface creeks were undermined or subsided. No subsidence ponding <br />overlying historical mined areas along Foidel Creek, or Middle Creek was evident in 2015. No ponding was <br />evident along Fish Creek in 2015, with the exception of a small permanently ponded area around alluvial well <br />AVF-15 that occurred around 2003. No significant/adverse water quality impacts relating to subsidence were <br />evident in 2015. <br />19 <br />