2014-05-01_REPORT - C1992081

• Permit No: C1992081
• IBM Index Class Name: Report
• Doc Date: 5/1/2014
• From: Jason Musick
• To: Janet Binns
• Annual Report Year: 2013
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Email Name: JHB
• Email Name: DIH
• Media Type: D
• Archive: No

Page 3 of 4
standard appropriate for the Loadout would be 10
mg /I based on the CDPHE revised standard for soils
with a higher pH as found at the Loadout. Neither well
displayed a manganese value higher than 3.215 mg /I
during the water year.
Well HGDAL3 exceeded the boron standard (750 ug /1)
with a value of 920 (ug /1) in September. Due to the
crop species grown within the Loadout area the
applicable standard for boron is 5000 ug /1.
TDS of alluvial ground water consistently exceeds
10,000 mg /1, indicating "Limited Use and Quality ".
Leachate originating from the Loadout would lack
sufficient head to migrate into underlying bedrock.
19. Restoration of
CDRMS regulation 4.05.12(3)
No mining or groundwater depletion has occurred at
ground recharge to
the site; however, for the 2013 water year, water levels
approximate pre- mining
at all wells fell within their historic ranges.
rate
20. Prevention of
CDRMS regulation 4.05.11(1)
As noted in Item 10 above, it was determined that
adverse impacts to
groundwater points of compliance are unwarranted at
ground water systems
the Hayden Gulch Loadout. It was determined that any
outside permit area
Leachate originating at the Ioadout would likely be of
better quality than native groundwater in the Lewis
Shale which has high concentrations of dissolved solids.
21. Prevention of
CDRMS regulation 4.05.11(2)
No mining or groundwater depletion has occurred at
impacts to ground
the site.
water that adversely
impact post- mining land
use
22. Minimize
CDRMS regulation 4.05.1(1)
The disturbance to the hydrologic balance within and
disturbance to
adjacent to the permit area caused by reclamation at
hydrologic balance
the Hayden Gulch Loadout is the minimum that can be
within and adjacent to
expected from a reclaimed surface Ioadout at this
the permit area
location.
23. Prevention of
CDRMS regulation 4.05.1(1)
Surface water - No surface water impacts due to mining
material damage to the
have occurred. Note Item No. 22 above
hydrologic balance
outside the permit area
Ground water— No material damage has occurred, as
discussed in item 20, above.
24. Agreement of
CDRMS regulation 2.05.6(3)
observed hydrologic
and requirement to keep
No local or regional impacts were observed. This
impacts with "probable
current, CDRMS regulation
observation is consistent with the PHC.
hydrologic
2.03.3(1)
consequences"