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Introduction The information assembled in this 2004 Annual Hydrology Report (AHR) includes data collected from approved monitoring sites established at Seneca Coal Company's (SCC) Seneca II-W Mine (State Permit No. C-82- 057). Locations of monitoring sites discussed in this report can be found by referring to Exhibit 7-1, Hydrology Monitoring Map, which may be found in the Seneca II-W Permit Application Package (PAP). In addition, NPDES ponds and surface water sites are located in Figures 1 and 2, Appendix A. All references to 2004 (or to "this year") will be for Water Year 2004 (October 1, 2003 through September 30, 2004) 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. Mining began at Seneca II-W in August 1990. Mining this year occurred in the Pond 016 and 017 basins. Field conductivity and pH meters were calibrated prior to each day's use. The conductivity meter is calibrated using a potassium chloride solution with an electrical conductivity in the 1000 to 3000 umhos/cm range. The pH meter is calibrated using NBS traceable buffers with pH values of 7 and 10. Prior to October 1, 1989, all field conductivity values collected at Seneca II-W monitoring sites were not corrected for temperature (i.e., 25° C). Field conductivity data starting on October 1, 1989 were temperature corrected to 25° C. The formula for correcting non-corrected conductivity data may be found in the 1990 through 1992 AHRs. SCC instituted in 1995 a new monitoring site numbering system for its new Paradox"'' water quality database. This new system is detailed in Table A. For convenience sake, this table has been placed at the end of the Table of Contents (see previous page). In addition, Table 3, Summary of Ground Water Monitoring Wells; Table 10, Summary of Surface Water Monitoring Sites; and the Table of Contents of Appendices C through E 1