2013-09-10_REPORT - C2009087

• Permit No: C2009087
• IBM Index Class Name: REPORT
• Doc Date: 9/10/2013
• Doc Name: 2012 Annual Hydrology Report Review
• From: DRMS
• To: Peabody Sage Creek Mining, LLC
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

18. Basic Standards for
CWQCC regulations
The PSCM did not generate significant amount of
Ground Water
41.4 and 41.5
leachates in 2012. Eight groundwater wells exceeded
the pH standard (8.5) in 2012. Five groundwater wells
exceeded the manganese standard (0.2 mg /1) in 2012.
As mentioned in the above item number 8 above, in soils
with a high pH a standard of 10 mg /I would be more
appropriate than the 0.2 mg /1. In 2012 no PSCM wells
displayed a value higher than 2.4 mg /1. Three wells
exceeded the fluoride standard (2.0 mg /1). The iron
standard was exceeded at alluvial well 71.
19. Restoration of
CDRMS regulation
For the 2012 water year, water levels at all wells fell
ground recharge to
4.05.12(3)
within their historic ranges. All alluvial wells displayed
approximate pre- mining
seasonal water level fluctuations in response to periods
rate
of precipitation recharge.
20. Prevention of
CDRMS regulation
Compliance with the Basic Standards for ground water,
adverse impacts to
4.05.11(1)
as in item 10, indicates the permittee is preventing
ground water systems
adverse impacts to ground water quality outside the
outside permit area
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 SCAL69, SGAL70, COV11, COV23, COV2633, COV2702,
CW23, CW2632, and CW2701. Alluvial wells SGAL70 and
SCAL69 and overburden Wells COV23 displayed their
lowest water levels on record. Overburden wells COV11
displayed a higher reading than previous. Overburden
wells COV23, COV2633, and COV2702 were all lower
than previous readings. Wadge Coal we11sCW23,
CW2632 and CW2701 were all lower than previous
readings. However, monitoring of these wells began in
2008; so long term data is not available. All alluvial wells
showed seasonal water level fluctuations in response to
periods of precipitation or lack thereof. Spoil well water
levels indicate that down slope highwall portions of the
spoil exhibit significant amounts of saturation.
21. Prevention of
CDRMS regulation
Underground development at the PSCM began during
impacts to ground
4.05.11(2)
the 2011 water year with no development work or
water that adversely
mining being conducted in the 2012 water year. Due to
impact post- mining land
the premature mining process, prevention of impacts to
use
groundwater cannot be determined as of the date of
this review.
22. Minimize
CDRMS regulation
The disturbance to the hydrologic balance within and
disturbance to
4.05.1(1)
adjacent to the permit area caused by mining and
hydrologic balance
reclamation at the PSCM is the minimum that can be
within and adjacent to
expected from a reclaimed surface mine at this location.
the permit area
Use of best management practices indicates