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Introduction <br />The information assembled in this 2011 Annual Hydrology Report (AHR) <br />includes data collected from approved monitoring sites established at <br />Seneca Coal Company's (SCC) Seneca II Mine (State Permit No. C -80 -005). <br />Locations of monitoring sites discussed in this report can be found by <br />referring to Exhibit 7 -2, Hydrology Monitoring Site Location Map, which <br />may be found in the Seneca II Permit Application Package (PAP). In <br />addition, NPDES ponds, surface water sites and spoil springs are located <br />in Figures 1 and 2, Appendix A. A map of ground water monitor wells may <br />be found in Figure 3. All references to 2011, or to "this year ", will be <br />for Water Year 2010 (October 1, 2010 through September 30, 2011) unless <br />otherwise noted. All tables referred to in the following text can be <br />found in Appendix A. In addition, a table of contents for Appendix A is <br />given at the beginning of that appendix. The last of the coal at this <br />mine was removed in August 1999. <br />A new mine has been created in a large part of the 2009 Seneca II Mine <br />permit area. This new mine, the Peabody Sage Creek Mine (PSCM, State <br />Permit No. C- 2009 -087) now includes the NPDES Ponds 002, 003 and 004 <br />drainage basins. The mining permit for the PSCM was approved by the <br />CDRMS in May 2010. This AHR will discuss monitoring sites that are <br />specific to the new (PR -02, approved December 2010) Seneca II Mine <br />hydrology program. Those include all sites in the NPDES Pond 008 basin, <br />as well as the sites on Fish Creek. A discussion of this year's data <br />from the hydrology monitoring sites associated with the old (pre - <br />December 2010) Seneca II Mine hydrology program may be found in the PSCM <br />2011 AHR. <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 3000 umhos /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 />