2012-12-19_REPORT - C1980005

• Permit No: C1980005
• IBM Index Class Name: Report
• Doc Date: 12/19/2012
• Doc Name: 2011 AHR Review
• From: DRMS
• To: Dennis Jones, Seneca Coal Company, LLC
• Annual Report Year: 2011
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

Page 6 of 6
within and adjacent to
reclamation at the Seneca II Mine
the permit area
is the minimum that can be
expected from a reclaimed surface
mine at this location. Use of best
management practices indicates
minimization of disturbance to the
hydrologic balance.
23. Prevention of
CDRMS regulation
YES
Surface water — Predictions were
material damage to the
4.05.1(1)
made for the TDS increases to be
hydrologic balance
observed on Fish Creek during the
outside the permit area
months of June and July due to
discharges from the Seneca II
Mine. In June, an 18% increase
was predicted between SSF11 and
SSF13. In July, a 13% increase was
predicted between SSF11 and
SSF13. Based on the information
provided there was a 9% increase
in TDS in June and a 2% increase in
July. It appears that the run -off
from Seneca II has little impact on
Fish Creek.
Ground water — No material
damage has occurred, as discussed
in item 20, above.
24. Agreement of
CDRMS regulation
YES
observed hydrologic
2.05.6(3) and
No local or regional impacts were
impacts with "probable
requirement to keep
observed. This observation is
hydrologic
current, CDRMS
consistent with the PHC.
consequences"
regulation 2.03.3(1)
projected in mining
It is noted that the accidences of
the CDPHE selenium standard may
need to be included in a revised
PHC section of the permit. A
determination should be made
based on the NPDES Compliance
Schedule to meet the selenium
limit by December 31, 2015
associated with the NPDES permit.
25. Adequacy of
CDRMS regulation
YES
ground water
4.05.13(1)
monitoring program
26. Adequacy of
CDRMS regulation
YES
surface water
4.05.13(2)
monitoring program