2011-02-25_REPORT - C2009087

• Permit No: C2009087
• IBM Index Class Name: Report
• Doc Date: 2/25/2011
• Doc Name: 2010 Annual Hydrology Report
• From: Sage Creek Coal Company, LLC
• To: DRMS
• Annual Report Year: 2010
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• Media Type: D
• Archive: No

Introduction
The information assembled in this 2010 Annual Hydrology Report (AHR)
includes data collected from approved monitoring sites established at
the Peabody Sage Creek Mine (PSCM), State Permit No. C-2009-087.
Locations of monitoring sites associated with the PSCM can be found by
referring to Map 2.04.7-M1, Hydrology, which may be found in Volume 4A
the PSCM Permit Application Package (PAP). Locations of monitoring sites
associated with the Seneca II Mine can be found by referring to Exhibit
7-2, Hydrology Monitoring Site Location Map, which may be found in the
Seneca II Permit Application Package (PAP). In addition, NPDES ponds,
surface water sites, monitor wells and spoil springs are located in
Figure 1, Appendix A. A general location map of Seneca Coal Company
sites may be found in Figure 2. All references to 2010, or to "this
year", will be for Water Year 2010 (October 1, 2009 through September
30, 2010) unless otherwise noted. All tables referred to in the
following text can be found in Appendix A. In addition, a table of
• contents for Appendix A is given at the beginning of that appendix.
This is the first AHR for the PSCM. The mining permit for the PSCM was
approved by the CDRMS in May 2010. No mining activities have occurred at
the PSCM as of January 2011. A large portion of the reclaimed Seneca II
Mine (State Permit No. C-80-005) exists in the PSCM permit area. The
last of the coal at the Seneca II Mine was removed in August 1999. Many
of the hydrology monitoring sites used by the Seneca II Mine continue to
be used for the PSCM. Therefore, when discussing historic data, the
Seneca II Mine (or, Seneca) name will be used. PSCM will be used when
discussing current data. There was some overlap of the two monitoring
programs this year. This AHR will discuss monitoring sites in use by
both the PSCM and the old Seneca II Mine hydrology program. Sites that
are specific to the new (approved December 2010) Seneca II Mine program
will be discussed in that AHR. Those include all sites in the NPDES Pond
008 basin, as well as the sites on Fish Creek.
. Field conductivity and pH meters are calibrated prior to each day's use.
The conductivity meter is calibrated using a potassium chloride solution
1