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Introduction <br />The information assembled in this 2014 Annual Hydrology Report (AHR) <br />includes data collected from approved monitoring sites established at <br />Seneca Coal Company's (SCC) Seneca II -W Mine (State Permit No. C -82- <br />057). Locations of monitoring sites discussed in this report can be <br />found by referring to Exhibit 7 -1, Hydrology Monitoring Map, provided in <br />the Seneca II -W Permit Application Package (PAP). In addition, NPDES <br />ponds and surface water sites are located in Figures 1 and 2, Appendix <br />A. A map of ground water monitor wells is provided in Figure 3. <br />All references to 2014 (or to "this year ") will be for Water Year 2014 <br />(October 1, 2013 through September 30, 2014) unless otherwise noted. All <br />tables referred to in the following text can be found in Appendix A. In <br />addition, a table of contents for Appendix A is given at the beginning <br />of that appendix. Mining began at Seneca II -W in August 1990. The last <br />of the coal at Seneca II -W was removed in January 2006. <br />Field conductivity and pH meters were calibrated prior to each day's <br />use. The conductivity meter is calibrated using a potassium chloride <br />solution with an electrical conductivity in the 1000 to 3000 umhos /cm <br />range. The pH meter is calibrated using NBS traceable buffers with pH <br />values of 7 and 10. <br />Prior to October 1, 1989, all field conductivity values collected at <br />Seneca II -W monitoring sites were not corrected for temperature (i.e., <br />25° C). Field conductivity data starting on October 1, 1989 were <br />temperature corrected to 25° C. The formula for correcting non - corrected <br />conductivity data may be found in the 1990 through 1992 AHRs. <br />SCC instituted in 1995 a new monitoring site numbering system for its <br />new Paradox TM water quality database. This revised system is detailed in <br />Table A. For convenience sake, this table has been placed at the end of <br />the Table of Contents (see previous page). In addition, Table 3, Summary <br />of Ground Water Monitoring Wells; Table 8, Summary of Surface Water <br />Monitoring Sites; and the Table of Contents of Appendices C through E <br />