2016-01-13_REPORT - C2009087

• Permit No: C2009087
• IBM Index Class Name: Report
• Doc Date: 1/13/2016
• From: DRMS
• To: Peabody Sage Creek Mining, LLC
• Annual Report Year: 2014
• Permit Index Doc Type: Hydrology Report
• Email Name: JLE
• Email Name: DIH
• Media Type: D
• Archive: No

Peabody Sage Creek Mining, LLC
Page 8
12/14/2015
20. Prevention of
CDRMS regulation
A groundwater point of compliance is not established for
adverse impacts to
4.05.11(1)
bed rock aquifers at this site. Compliance with the Basic
ground water systems
Standards for ground water, as in item 10, indicates the
outside permit area
permittee is likely 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 as well. 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 the
impacts to ground water
4.05.11(2)
2011 water year with no development work or mining
that adversely impact
being conducted in the 2014 water year. Due to the
post -mining land use
premature mining process, prevention of impacts to
groundwater cannot be determined as of the date of this
review.
22. Minimize
CDRMS regulation
Use of best management practices indicates minimization
disturbance to
4.05.1(1)
of disturbance to the hydrologic balance.
hydrologic balance
within and adjacent to
No determination has been made concerning Item no. 7
the permit area
mentioned above. An investigation by the CDPHE and
Peabody Sage Creek Mining as to the cause of the
elevated selenium measurements is ongoing. Should it
be determined that these exceedances are due to impacts
permitted under the current mine plan, revisions to the
PHC may need to be required.
PSCM will need to continue to monitor manganese levels
at SSSPG6, a spoil spring that discharges into Little
Grassy Creek. The manganese level reported at this spoil
spring is above to 10 mg/1 EPA standard discussed in
Item No. 8 above.
23. Prevention of
CDRMS regulation
Surface water - No surface water impacts due to mining
material damage to the
4.05.1(1)
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.