2014-05-30_REPORT - C1994082

• Permit No: C1994082
• IBM Index Class Name: Report
• Doc Date: 5/30/2014
• From: DRMS
• To: Seneca Coal Company
• Annual Report Year: 2013
• Permit Index Doc Type: Hydrology Report
• Email Name: JHB
• Email Name: DIH
• Media Type: D
• Archive: No

Page 4 of 5
samples
1994 -082
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 2013. One groundwater well exceeded the
manganese standard (0.2 mg /1) in 2013. 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 2013 the Yoast Mine wells did not displayed a value
higher than 0.442 mg /1.
19. Restoration of ground
CDRMS regulation
For the 2013 water year, water levels at all wells fell within
water recharge to
4.05.12(3)
their historic ranges, with the exception of wells YSAL3 and
approximate pre- mining rate
YOV30. Sage Creek Alluvial Well YSAL3 displayed its highest
level ever during the 2013 water year with a value of 2.56
feet. Overburden Well YOV30 displayed its lowest water level
during 2013 with a value of 128.10 feet. All alluvial wells
displayed seasonal 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 with the exceptions noted in Item 19 above. 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 —A prediction was made as to the increase in
damage to the hydrologic
4.05.1(1)
TDS would be observed at various stream sites during the
balance outside the permit
irrigation season (June- September). Average TDS at all four