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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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Mine Discharge: Mine water discharge site 109 did not discharge to Foidel in 2008. Site 115 had ]limited <br />• discharge to Fish Creek in 2008. TCC had redirected pumped mine water from the site 115 source in 2005 to <br />underground locations for dust control. <br />The mine pump at TORT began discharging to Foidel in September 2008 under an emergency discharge permit <br />issued by CDPHE. TCC has been in contact with Gary Beers and Andrew Neuhart of CDPHE, regarding <br />difficulties in currently meeting WET and iron standards at the HDPE pipeline discharge source. TCC has <br />requested that CDPHE consider that site 900 is able to meet requirements, and allow us to continue discharging <br />until TCC can select and construct a treatment system. They are considering the request. <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 Shale. <br />This contact has provided the opportunity for additional salts and iron to be leached from this unit. The pumping <br />of the sump should see a decrease in the elevation of the pool over time, with an anticipated decrease in the EC <br />and concentration of iron in the effluent. <br />Subsidence: During 2008, no ponds, or other structures were undermined or subsided. No subsidence ponding <br />overlying subsurface mined areas along Foidel Creek or Middle Creek was evident in 2008. No <br />. significant/adverse water quality impacts relating to subsidence were evident in 2008. <br />• <br />18
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