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• Introduction <br />The information assembled in this 2002 Annual Hydrology Report (AHR) <br />includes data collected from approved monitoring sites established at <br />Seneca Coal Company's (SCC) Seneca ZI-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, which may <br />be found in the Seneca II-W Permit Application Package (PAP). <br />All references to 2002 (or to "this year") will be for Water Year 2002 <br />(October 1, 2001 through September 30, 2002) 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 IZ-W in August 1990. Mining <br />this year occurred in the Pond 015 and 016 basins. <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'"" water quality database. This new 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 10, Summary of Surface water <br />Monitoring Sites; and the Table of Contents of Appendices C through E <br />have all been revised to correlate the old site (and map) name to the <br />