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• exhibiting only seasonal fluctuations. Two springs (SW-1 and SW-2) are monitored in the same vicinity as <br />91M001 and 91M004. Minor flow was detected in SW-2 during 2006. The Ashley well was undermined in <br />1999 and exhibited water level declines corresponding to mining activity. This well appeared to be recovering in <br />2000 ,continuing through 2006. <br />No unusual observations are noted with respect to Foidel Creek alluvium groundwater levels. The historical <br />increasing conductivity trend in well 001-5-5 (Figure 32) stabilized in 2004, and appears to be increasing again <br />through the end of 2006. <br />No unusual observations are noted with respect to Fish Creek alluvium groundwater levels. The general water <br />level decline noted in well 006-AY-1 (Figure 34) since 1995, appears to continue in 2006. Overall, fluctuations <br />at this well are insignificant. No other notable water level observations are apparent based upon review of the <br />2006 data. Field conductivity readings at this well appear stable over the last few years. Two new alluvial wells <br />(AVF-13 and AVF-14) were installed in August 2001, and one (AVF-15) in June 2002. The only unusual <br />observation made to date were elevated iron concentrations in 2003 and 2004, some of which may be related to <br />subsidence ponding. These levels appear 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 may be the result of upgradient spring runoff flushing through the old P & M mine area. <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 />discharge from the TCC mine area with the potential to impact off-site areas. Discharges from sedimentation <br />ponds predominately occurred 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 discharge to Foidel in <br />2006. Site I15 did not discharge to Fish Creek in 2006. TCC has redirected mine water from this source, to <br />underground locations for dust control. <br />Mine Dischar¢e:No significant hydrology impacts, attributable to CDPS discharge activities at the Poidel Creek <br />Mine, were noted during 2006, with the exception of the unantic}pated discharge of coal fines to Foidel Creek <br />from a raptured wash plant slurry 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 ]ow 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 />16 <br />