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observation made to date were elevated iron concentrations in 2003 and 2004, some of which may be related to <br />subsidence ponding. These levels appeaz to have returned to those seen with normal seasonal fuctuations. The <br />data base for these sites will require expanding before a complete assessment can be made. <br />Surface Water: Recorded surface water flows for Foidel Creek, Fish Creek, and Trout Creek were generally <br />low in comparison to TCC's historic record. This is undoubtedly associated with general drought conditions seen <br />in this area over the last few years. <br />Conductivity concentrations at site 301, 69, and 1005 on Trout Creek appeared elevated during the spring runoff <br />season in April. This tray be the result of upgradient spring runoff flushing through the old P & M mine azea. <br />No other notable water quality impacts are evident at any surface water sites monitored during 2006. <br />Recorded 2006 spoil spring discharges remain negligible and, therefore, did not constitute a significant portion of <br />dischazge from the TCC mine area with the potential to impact off-site areas. Dischazges from sedimentation <br />ponds predominately occulted in conformance with applicable CDPS permit limitations and therefore did not <br />constitute significant impacts to receiving waters. Mine water discharge site 109 did not dischazge to Foidel in <br />2006. Site 115 did not dischazge to Fish Creek in 2006. TCC has redirected mine water from this source, to <br />underground locations for dust control. <br />Mine Discharee:No significant hydrology impacts, attributable to CDPS dischazge activities at the Foidel Creek <br />Mine, were noted during 2006, with the exception of the unanticipated discharge of coal fines to Foidel Creek <br />from a ruptured wash plan[ shiny pipeline into Pond E (CO-0027154 Outfall No. 006). Fines made it <br />approximately 2.8 miles downstream of the outfall where they dropped out in a low flowing flat marshy area. No <br />significant water quality impacts were noted downstream beyond the marshy area, however the vent resulted in <br />NOV CV-2006-006. As discussed, TCC implemented a timely remediation of the Pond and coal fines located <br />along the banks of Foidel Creek and in Foidel Creek culverts in consultation with DRMS. Foidel Creek <br />remediation was completed in October 2006 to the satisfaction of a DRMS abatement order. Final dredging of <br />Pond E was completed in January 2007. <br />Inlow: No unusual occurrences of inflow were noted as a result of the Annual Mine Inflow study. Inflows are <br />within the projected flows presented in the permit. Water quality has not changed significantly and appears to <br />mirror the quality of the adjacent spoil water. It appears that the elevated EC and iron readings are associated <br />with the water that has pooled in the mine sump, in contact with the overlying Marine Shale. This contact has <br />provided [he opportunity for additional salts and iron to be leached from [his unit. The pumping of the sump <br />should see a decrease in the elevation of the pool over time, with an anticipated decrease in the EC and <br />concentration of iron in the effluent. <br />Subsidence: During 2006, subsidence survey data was collected periodically from established monuments on <br />the Union Pacific Railroad and the YVEA power line in azeas underlain by gate roads or panel centers during <br />periods of mining in the 18 and 19 Rt longwall panels. Subsidence survey data was collected periodically from <br />established monuments on the Union Pacific Railroad in areas underlain by gate roads or panel centers during <br />periods of mining in the 18 and 19-Right longwall panels. <br />17 <br />