Laserfiche WebLink
Conductivity concentrations at site 301, 69, and 1005 on Trout Creek appeared somewhat elevated during the <br />spring runoff season in April. Thi ii may be the result of pgradient spring runoff flushingthrough tl e old P & M I <br />mine area. Fish exhibited some short term spikes in total recoverable iron in the spring. This may be related to a <br />erosion from a precipitation event or a quick rise in snow melt. No other water quality impacts of concern were <br />evident at any surface water sites monitored during 2016. <br />Spoil Springs: Recorded 2016 spoil spring discharges (site 303-1) occurred in 2016. 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 pennit limitations and therefore did not constitute significant impacts to receiving waters. <br />Mine Discharl1e: Mine water discharge site 109 did not discharge to Foidel in 2016. 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 2016 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 pennit <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 />pennited 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 cuality 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 />associa ed with the water that has pooled in the mii ie sump, which is in c ntact with the overlying Marine Shales. <br />This contact has provided the opportunity for additonal 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 thet SubTerra Subsidence report: <br />8.1. Union Pacific Railroad Energy Spur <br />Some general conclusions can be drawn from the initial ork described in Section 3, including: <br />1. With the exception of panel 4 -Ea t, the majority of the ovement associated with each <br />longwall will occur over a one mon h period starting when the face is about 500 -feet from the <br />rail line and ending when the face is about 1,000 -feet past the rail line. This distance is <br />measured parallel to face retreat. <br />2. During pre -ballasting, track differential gradients will generally be maintained below 0.4% <br />19 <br />