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2009-03-03_REPORT - C1982056 (2)
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2009-03-03_REPORT - C1982056 (2)
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Last modified
8/24/2016 3:44:04 PM
Creation date
3/3/2009 10:37:54 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
REPORT
Doc Date
3/3/2009
Doc Name
2008 Annual Hydrology Report
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2008
Permit Index Doc Type
Hydrology Report
Email Name
JHB
Media Type
D
Archive
No
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into the mine workings have been encountered to explain this difference in potentiometric surface or to suggest <br />that dewatering of the formation is directly attributable to mining activities. No readily apparent water quality <br />impacts associated with mining are noted for the Trout Creek Sandstone aquifer based upon data collected during <br />2008. <br />Mining related dewatering impacts were noted for the Fish Creek sandstone wells 91M001 and 91M004 (Figure <br />26), and the Ashley well (Figure 27). Wells 91M001 and 91M004 were undermined in 1995 and exhibited <br />historic water level declines corresponding to mining activity. Water levels in these wells subsequently stabilized, <br />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-1 during May and August of 2008. SW-2 exhibited no <br />flow in 2008. The Ashley well was undermined in 1999 and exhibited water level declines corresponding to <br />mining activity. This well appeared to be recovering in 2000, continuing through 2008. <br />No unusual observations are noted with respect to Foidel Creek alluvium groundwater levels. The historical <br />increasing conductivity trend in well 001-S-5 (Figure 32) stabilized in 2004, and appears to be increasing again <br />through the end of 2008. <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 2008. Overall, fluctuations <br />at this well are insignificant. No other notable water level observations are apparent based upon review of the <br />2008 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 />high in comparison to TCC's historic record. Flooding of Fish Creek was observed in March and April. A <br />stream gage study was initiated by TCC with the aid of a consultant in the fall of 2007, continuing through 2008. <br />This study will continue in the spring, summer and fall of 2009. A discussion of this study, including results for <br />re-evaluating stream rating curves will be included in the 2009 AHR. <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 2008. <br />Spoil Springs: Recorded 2008 spoil spring discharges remain negligible and, therefore, did not constitute a <br />significant portion of discharge from the TCC mine area with the potential to impact off-site areas. Discharges <br />from sedimentation ponds predominately occurred in conformance with applicable CDPS permit limitations and <br />therefore did not constitute significant impacts to receiving waters. <br />17
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