2011-05-11_REPORT - C1980005

• Permit No: C1980005
• IBM Index Class Name: Report
• Doc Date: 5/11/2011
• Doc Name: 2010 AHR Review
• From: DRMS
• To: Hayden Gulch Terminal, Inc
• Annual Report Year: 2010
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Media Type: D
• Archive: No

approximate pre-mining
rate
20. Prevention of CDRMS regulation YES Compliance with the Basic
adverse impacts to 4.05.11(1) Standards for ground water, as in
ground water systems item 10, indicates the permittee is
outside permit area preventing adverse impacts to
ground water quality outside the
permit area. Monitoring data
indicate the permittee is
preventing impacts to water
quantity outside the permit area.
Hydrology reports indicate that a
water level at all wells fell within
their historic ranges, with the
exception of well SFAL72. SFAL72
is new to the monitoring program
so long term data is not available.
All alluvial wells showed seasonal
water level fluctuations in
response to periods of
precipitation or lack thereof.
Overburden and coal well water
levels are fluctuating in response
to the precipitation recharge and
ground water flow from the
reclaimed mine pits.
21. Prevention of CDRMS regulation YES
impacts to ground 4.05.11(2)
water that adversely
impact post-mining land
use
22. Minimize CDRMS regulation YES The disturbance to the hydrologic
disturbance to 4.05.1(1) balance within and adjacent to the
hydrologic balance permit area caused by mining and
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