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Introduction <br />The information assembled in this 2013 Annual Hydrology Report (AHR) <br />includes data collected from approved monitoring sites established at <br />the Peabody Sage Creek Mine (PSCM), State Permit No. C- 2009 -087. <br />Locations of monitoring sites associated with the PSCM can be found by <br />referring to Map 2.04.7 -M1, Hydrology, provided in Volume 4A the PSCM <br />Permit Application Package (PAP). Locations of monitoring sites <br />associated with the Seneca II Mine can be found by referring to Exhibit <br />7 -2, Hydrology Monitoring Site Location Map, provided in the Seneca II <br />Permit Application Package (PAP). In addition, NPDES ponds, surface <br />water sites, monitor wells and spoil springs are located on Figure 1, <br />Appendix A. A general site map of PSCM and Seneca Coal Company <br />monitoring sites is provided in Figure 2. All references to 2013, or to <br />"this year ", will be for Water Year 2013 (October 1, 2012 through <br />September 30, 2013) unless otherwise noted. All tables referred to in <br />the following text can be found in Appendix A. In addition, a table of <br />contents for Appendix A is given at the beginning of that appendix. <br />This is the fourth AHR for the PSCM. The mining permit for the PSCM was <br />approved by the CDRMS in May 2010. Excavation of the portal area began <br />in June 2011. A large portion of the reclaimed Seneca II Mine (State <br />Permit No. C -80 -005) has been incorporated in the PSCM permit area. The <br />last of the coal at the Seneca II Mine was removed in August 1999. Many <br />of the hydrology monitoring sites used by the Seneca II Mine continue to <br />be used for the PSCM. Therefore, when discussing historic data, the <br />Seneca II Mine (or, Seneca) name will be used. PSCM will be used when <br />discussing current data. Sites that are specific to the new Seneca II <br />Mine program (Permit Revision 2, approved December 2010) will be <br />discussed in that AHR. Those include all sites in the NPDES Pond 008 <br />basin, as well as the sites on Fish Creek. <br />Field conductivity and pH meters are calibrated prior to each day's use. <br />The conductivity meter is calibrated using a potassium chloride solution <br />with an electrical conductivity in the 1000 to 4000 umhos /cm range. The <br />pH meter is calibrated using NBS traceable buffers with pH values of 7 <br />1 <br />