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Introduction <br />The information assembled in this 2015 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 of 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 />PAP. In addition, NPDES ponds, surface water sites, monitor wells and <br />spoil springs are depicted on Figure 1, Appendix A. A general site map <br />of PSCM and Seneca Coal Company monitoring sites is provided in Figure <br />2. All references to 2015, or to "this year", will be for Water Year <br />2015 (October 1, 2014 through September 30, 2015) unless otherwise <br />noted. All tables referred to in the following text can be found in <br />Appendix A. In addition, a table of contents for Appendix A is given at <br />the beginning of that appendix. <br />This is the sixth 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. <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 umbos/cm range. The <br />pH meter is calibrated using NBS traceable buffers with pH values of 7 <br />and 10. Prior to October 1, 1989, all field conductivity values <br />collected at Seneca II monitoring sites were not corrected for <br />temperature (i.e., 25° C). Field conductivity data starting on October <br />1 <br />