2016-08-25_REPORT - C2009087

• Permit No: C2009087
• IBM Index Class Name: REPORT
• Doc Date: 8/25/2016
• From: DRMS
• To: Peabody Sage Creek Mining, LLC
• Annual Report Year: 2015
• Permit Index Doc Type: Hydrology Report
• Email Name: JLE
• Email Name: DIH
• Media Type: D
• Archive: No

Peabody Sage Creek Mining, LLC
Page 11
8/25/2016
19. Restoration of
CDRMS regulation
For the 2015 water year, water levels at all wells fell
ground recharge to
4.05.12(3)
within their historic ranges with the exception of Well
approximate pre -mining
SSP61 which fell below is historic range and then
rate
rebounded. All alluvial wells displayed seasonal water
level fluctuations in response to periods of precipitation
recharge. Overburden and coal well water are fluctuating
in response to the precipitation recharge, induced ground
water flow to the reclaimed mine pits, and in some cases,
changes in reservoir water levels.
20. Prevention of
CDRMS regulation
A groundwater point of compliance is not established for
adverse impacts to
4.05.11(1)
bedrock aquifers at this site. Compliance with the Basic
ground water systems
Standards for ground water, as discussed in Item 10
outside permit area
above, indicates the permittee is likely preventing
adverse impacts to ground water quality outside the
permit area. All alluvial wells showed seasonal water
level fluctuations in response to periods of precipitation
or lack thereof. Overburden and coal well water are
fluctuating in response to the precipitation recharge,
induced ground water flow to the reclaimed mine pits,
and in some cases, changes in reservoir water levels.
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 and stopped soon after and no
that adversely impact
development work or mining was conducted in the 2015
post -mining land use
water year. Due to the premature mining process,
prevention of impacts to groundwater cannot be
determined as of the date of this review.
22. Minimize
CDRMS regulation
Exceedances of applicable water quality standards are
disturbance to
4.05.1(1)
discussed in the preceding review items. Please see
hydrologic balance
above for details. For surface water, no exceedances of
within and adjacent to
the effluent limitations were reported for the 2015 water
the permit area
year with the exception of an Iron exceedance at NPDES
Outfall 003 in October of 2014. For groundwater, it has
previously been determined that a bedrock groundwater
point of compliance well is not necessary. The alluvial
groundwater point of compliance well exceeded the
Cadmium standard noted in Table 7 of the AHR but did
not exceed the CWQCC Reg. 41 standard. Other