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2009-06-12_REPORT - C1982056
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2009-06-12_REPORT - C1982056
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Last modified
8/24/2016 3:47:40 PM
Creation date
6/15/2009 12:18:02 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
REPORT
Doc Date
6/12/2009
Doc Name
2008 AHR Review Letter
From
DRMS
To
Twentymile Coal Company
Annual Report Year
2008
Permit Index Doc Type
Hydrology Report
Email Name
TAK
Media Type
D
Archive
No
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<br /> <br />Requirement <br />Requirement <br /> <br />citation Require- <br />ment <br />complied <br />with ? (yes <br />/ no) <br /> <br />Comment <br /> The mine discharges surface runoff and pumped mine water to the following stream <br /> segments in Region 12 of the Yampa River basin: <br /> Segment 13c, Trout Creek above Fish Creek <br /> Segment 13b, Foidel Creek <br /> Segment 13a, Trout Creek below Fish Creek <br /> CWQCC lists numeric standards for these segments in its regulation Regulation 133. <br /> Long-term historical monitoring data from the stream segments indicate the iron numeric <br /> standard is frequently exceeded and the lead and manganese standards are occasionally <br /> exceeded. Premining data indicate these exceedances usually are unrelated to areas <br /> covered by active mine permits. <br /> Snowmelt from historically deep snowpack in 2008 is the suspected cause of relatively <br /> high flow rates in Foidel Creek at Site 008, located immediately upstream from the Foidel <br /> Creek Mine. Foidel Creek at Site 008 is fed by surface runoff and coal spoil leachate <br /> springs on the historical Eckman Park/Energy Fuels coal mining area. Samples from Site <br />E. Instream CWQCC Regulation 008 had historically high iron and sulfate concentrations in March, April, June, and <br />Numeric 133 yes September of 2008. The suspected sources of these high concentrations are large volumes <br />Standards of snowmelt that would have infiltrated spoil backfill in the Eckman Park/Energy Fuels <br /> area, and then would have flowed as surface runoff to the channel of Foidel Creek (via <br /> Pond A, upslope from the Foidel Creek Mine). <br /> Spoil leachate from Eckman Park, carried in the channel of Foidel Creek to Trout Creek, is <br /> a suspected major source of the high iron and sulfate concentrations observed in Trout <br /> Creek at Site 1005 in March, April, June, and September of 2008. CWQCC Regulation <br /> No. 133 indicates Trout Creek Site 1005 is subject to a 10 mg/l total recoverable iron <br /> standard and a contingent 250 mg/l sulfate standard. (Applicability of the sulfate standard <br /> is contingent on actual or potential domestic water use in the stream segment.) The iron <br /> and sulfate instream standards were exceeded at Site 1005 on Trout Creek in March, April, <br /> June. The sulfate standard was also exceeded in September. The Foidel Creek Mine may <br /> have contributed to the iron exceedance in March by pumping underground mine water <br /> into Fish Creek from the Fish Creek Borehole, and may have contributed to the sulfate <br /> exceedance in September by pumping underground mine water into Foidel Creek from <br /> Panel 10 Right. As explained in preceding item D, these pumped discharges were <br /> reported to CWQCD in CDPS discharge monitoring reports. <br />Page 3
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