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2022-09-06_REPORT - C1982056 (3)
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2022-09-06_REPORT - C1982056 (3)
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Last modified
9/8/2022 12:42:23 PM
Creation date
9/7/2022 11:13:24 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
9/6/2022
Doc Name Note
2021 Annual Hydrology Report Text
Doc Name
Annual Hydrology Report
From
Twentymile Coal, LLC
To
DRMS
Annual Report Year
2021
Email Name
TNL
Media Type
D
Archive
No
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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> limitations and therefore did not constitute significant impacts to receiving waters. See Section 3.4 <br /> for more information. <br /> Mine Discharge: <br /> Mine water discharge sites 109 and 115 did not discharge in 2020. Site 7 (Area #1 Pit) receives <br /> dewatering water from wells located at the former Fish Creek vent shaft in the old Western <br /> Mining District (WMD) and the 10RT well located in the old Eastern Mining District (EMD). The <br /> Pit overflow goes through DRMS site 7 to Pond D, which may in turn flow into Foidel Creek via <br /> CDPS Outfall 005A (a.k.a. site 84). There were no exceedances of the CDPS permit limits at <br /> Pond D/Outfall 005A in 2021. <br /> Mine Inflow: <br /> No unusual occurrences of inflow were noted as a result of the Annual Mine Inflow study. Inflows <br /> are within the projected flows presented in the permit. Water quality has not changed significantly <br /> and appears to mirror the quality of the adjacent spoil water. It appears that the elevated EC and <br /> iron readings are associated with the water that has pooled in the mine sump, which is in contact <br /> with the overlying Marine Shales. This contact has provided the opportunity for additional salts <br /> and iron to be leached from this unit. The pumping of mine water and sumps should see a <br /> 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 /> 29 <br />
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