2013-12-11_REPORT - C1994082

• Permit No: C1994082
• IBM Index Class Name: REPORT
• Doc Date: 12/11/2013
• Doc Name: 2012 Annual Hydrology Report Review
• From: DRMS
• To: Seneca Coal Company
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

Page 4 of 5
16. Sampling frequency of
Tab 15, Table 15 -8 of
Ground water samples are collected from YSAL1, YSAL3,
ground water monitoring
CDRMS mining permit C-
YAAL14, YGAL16, YOV30, YW30 YWU30, YWC33, YWCU33,
wells
1992 -084
YTM32, and SGAL70 and SFAL72 on an annual basis.
17. Parameters to be
Volume 14, p. 2.04.7 -2
Parameters to be sampled are conductivity (umhos /cm), pH
analyzed in ground water
of CDRMS mining permit
(units), temperature (C), dissolved iron (mg /1), dissolved
samples
C- 1980 -005
manganese (mg /1), dissolved fluoride (mg /1), dissolved nitrate
(mg /1), dissolved nitrite (mg /1), dissolved selenium (ug /1),
dissolved sulfate (mg /1), total suspended solids (mg /1), and
total dissolved solids (mg /1). All parameters were met.
18. Basic Standards for
CWQCC regulations 41.4
The Yoast Mine did not generate significant amount of
Ground Water
and 41.5
Ieachates in 2012. One groundwater well 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 .2
mg /1. In 2012 neither of the Seneca II wells displayed a value
higher than 0.47 mg /1.
19. Restoration of ground
CDRMS regulation
For the 2012 water year, water levels at all wells fell within
water recharge to
4.05.12(3)
their historic ranges. All alluvial wells displayed seasonal
approximate pre- mining rate
water level fluctuations in response to periods of
precipitation recharge.
20. Prevention of adverse
CDRMS regulation
Compliance with the Basic Standards for ground water, as in
impacts to ground water
4.05.11(1)
item 10, indicates the permittee is preventing adverse
systems outside permit area
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. 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 impacts to
CDRMS regulation
No material damage has occurred, as discussed in item 20,
ground water that adversely
4.05.11(2)
above.
impact post- mining land use
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 Yoast Mine is the minimum that can be
area
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 5 of
damage to the hydrologic
4.05.1(1)
the 7 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 four
sites was lower than predicted for the 2012 water year.