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from sedimentation ponds predominately occurred in conformance with applicable CDPS permit limitations and <br />. therefore did not constitute significant impacts to receiving waters. <br />Mine Discharge: Mine water discharge site 109 did not discharge to Foidel in 2010. In 2005, TCC began <br />redirecting electro-coagulation treated mine water pumped from the Fish Creek Borehole well, underground <br />locations for dust control. No mine water from the Fish Creek Borehole well (which is treated by electro- <br />coagulation), was directed through Site 115 and then to Fish Creek in 2010. <br />The mine pump at TORT began discharging to Foidel in September 2008 under an emergency discharge permit <br />issued by CDPHE. In early 2009, TCC experienced difficulties in consistently meeting WET and iron standards <br />at the pipeline discharge source. In the second quarter of 2009, TCC halted all discharge at the discharge source <br />permited under the emergency discharge permit, and re-directed TORT dewatering to the Area # 1 Pit. The Pit <br />may overflow (via site 7) to Pond D, which may in turn flow into Foidel Creek via CDPS Outfall 005A (a.k.a. <br />site 84). CDPS Permit parameter limitations at 005A were met in 2010. As indicated above, future treatment of <br />TORT 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 are <br />associated with the water that has pooled in the mine sump, which is in contact with the overlying Marine Shale. <br />This contact has provided the opportunity for additional salts and iron to be leached from this unit. The pumping <br />of the sump should see a decrease in the elevation of the pool over time, with an anticipated decrease in the EC <br />and concentration of iron in the effluent. <br />Subsidence: During 2010, no ponds or surface creeks were undermined or subsided. No subsidence ponding <br />overlying subsurface mined areas along Foidel Creek, or Middle Creek was evident in 2010. No ponding was <br />evident along Fish Creek in 2010, with the exception of a small permanently ponded area around alluvial well <br />AVF-15. No significant/adverse water quality impacts relating to subsidence were evident in 2010. <br />• <br />20