2021-11-22_PERMIT FILE - C1992081 ‎(2)‎

• Permit No: C1992081
• IBM Index Class Name: Permit File
• Doc Date: 11/22/2021
• Section_Exhibit Name: Tab 13 Hydrologic Monitoring Program
• Media Type: D
• Archive: No

REVISED MONITORING PROGRAM (2016 TR-11)
The current (2005-2016) monitoring program consists of spring and fall
full-suite water quality sampling of upstream and downstream surface and
ground water sites. In addition, National Pollutant Discharge
Elimination System (NPDES) monitoring occurs at two outfalls. The tipple
area was fully reclaimed in 2011. The office area was fully reclaimed in
2013. Vegetation is coming back very well. Only the rail track remains.
Since the tipple and office areas are fully reclaimed, the surface and
ground water quality parameter lists were revised in TR11 submitted in
2016. Surface water monitoring at sites HGSD1 and HGSD3 in the spring
and fall will be retained. Ground water monitoring at wells HGDAL3 and
HGDAL4 will be reduced from semiannual to annual (spring), which is
consistent with the monitoring programs for the adjacent Peabody Energy
closed mines, Seneca II-W and Yoast. NPDES monitoring will be continued
per the NPDES permit.
Data from the upstream (HGSD1) and downstream (HGSD3) surface water
sites for the last five years (2011 to 2015) were compared to the
receiving stream standards for lower Dry Creek (Yampa Segment 13h,
Regulation No. 33, June 2014). Parameters that exceeded the standards
were total recoverable (TR) iron, nitrites, and dissolved selenium.
Those parameters will be analyzed as part of the new surface water
parameter list, Table 13-3. In addition, to be consistent with Colorado
Department of Reclamation, Mining, and Safety (CDRMS) requirements and
surface water parameter lists from adjacent mining areas, the following
parameters will also be monitored: flow, temperature, conductivity, pH,
manganese, total dissolved solids (TDS) and total suspended solids
(TSS).
Data from upgradient (HGDAL4) and downgradient (HGDAL3) wells for the
last five years (2011 to 2015) were compared to Colorado Department of
Public Health and Safety (CDPHE) ground water agricultural use standards
(CDPHE, Reg. 41, 2008). Parameters that exceeded the standards were
boron and manganese. According to the CDPHE, the 750 ug/l boron standard
is set for sensitive crops, and that the limit otherwise is 5000 ug/l.
None of these sensitive plant species are grown commercially in this
area. The highest boron value from a HGT well was 920 mg/l, therefore,
boron monitoring will be discontinued. Manganese monitoring will be
retained. To be consistent with CDRMS requirements and ground water
parameter lists from adjacent mining areas, the following parameters
will also be monitored: depth to water, temperature, conductivity, pH,
iron and total dissolved solids (TDS). All parameters will be analyzed
as part of the new ground water parameter list, Table 13-4.
2021 PR-2
With the approval of PR-2 the land use for majority of the Rail loop and
Rail Spur will be changed to recreation. Following SL2, releasing the
recreation area, groundwater well HGDAL3 will no longer be required to
be monitored. HGDAL3 will be removed and abandoned prior to the transfer
of the property to the Town of Hayden.
PR-02 13 Revised 11/21