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Conductivity concentrations at site 301, 69, and 1005 on Trout Creek appeared somewhat elevated during the <br />spring runoff season in April and again when flow is at a minimum during the early fall. This may be the result <br />of upgradient spring runoff flushing through the old P & M mine area. Fish exhibited some short term spikes in <br />total recoverable iron in the spring. This may be related to a erosion from a precipitation event or a quick rise in <br />snow melt. No other water quality impacts of concern were evident at any surface water sites monitored during <br />2017. <br />Spoil Springs: Spoil spring discharges (303 series) occurred in 2017 only at 303-1. The 2012 reclamation at the <br />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 2017. 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 during the months <br />of April, May and June. <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, 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 IORT (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 are <br />associated with the water that has pooled in the mine sump, which is in contact with the overlying Marine Shales. <br />This contact has provided the opportunity for additional salts and iron to be leached from this unit. The pumping <br />of mine water and sumps 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: Excerpts from the conclusions section of the SubTerra Subsidence report: <br />8.1. Union Pacific Railroad Energy Spur <br />Some general conclusions can be drawn from the initial work described in Section 3, including: <br />1. With the exception of panel 4 -East, the majority of the movement associated with each longwall will <br />occur over a one month period starting when the face is about 500 -feet from the rail line and ending <br />when the face is about 1,000 -feet past the rail line. This distance is measured parallel to face retreat. <br />19 <br />