2013-12-31_REPORT - C1982057

• Permit No: C1982057
• IBM Index Class Name: REPORT
• Doc Date: 12/31/2013
• Doc Name: 2012 Annual Hydrology Report Review
• From: DRMS
• To: Roy Karo
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

Page 5 of 5
22. Minimize disturbance to
CDRMS regulation
The disturbance to the hydrologic balance within and
hydrologic balance within
4.05.1(1)
adjacent to the permit area caused by mining and
and adjacent to the permit
reclamation at the Seneca II -W Mine is the minimum that can
area
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 material
CDRMS regulation
Surface water— Predicted TDS values were exceeded at 1 of
damage to the hydrologic
4.05.1(1)
the 3 sites. A prediction was made as to the increase in TDS
balance outside the permit
would be observed at various stream sites during the
area
irrigation season (June- September). Average TDS at all three
sites was lower than predicted for the 2012 water year.
Ground water— In Tab 17 of the PAP, predictions were made
as to the expected TDS increases to be observed at various
monitoring wells. Predicted TDS values were exceeded at 3
of the 7 sites. No material damage has occurred, as discussed
in item 20, above. Agricultural ground water standards were
exceeded at four monitoring wells. Baseline information
shows that several parameter concentrations in excess of
both irrigation and livestock standards.
24. Agreement of observed
CDRMS regulation
hydrologic impacts with
2.05.6(3) and
No local or regional impacts were identified in the AHR. This
"probable hydrologic
requirement to keep
observation is consistent with the PHC.
consequences" projected in
current, CDRMS
mining
regulation 2.03.3(1)
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 ground
CDRMS regulation
The current ground water monitoring program continues to
water monitoring program
4.05.13(1)
adequately address the protection of the hydrologic balance.
26. Adequacy of surface
CDRMS regulation
The current surface water monitoring program continues to
water monitoring program
4.05.13(2)
adequately address the protection of the hydrologic balance.