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<br />Introduction <br />The information assembled in this 2001 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). All <br />references to 2001, or to "this year", will be for Water Year 2001 <br />(October 1, 2000 through September 30, 2001) unless .otherwise noted. <br />All tables referred to in the following .text can be found in Appendix A. <br />In addition, a table of contents for Appendix A' is given at the <br />beginning of that appendix. The last of the coal at this mine was <br />removed in 1999. <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, 1989 were temperature corrected to 25° C. The formula for correcting <br />non-corrected conductivity data may be found in the 1990 through 1992 <br />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, <br />Summary of 'Ground Water Monitoring Wells; Table 9, Summary of Surface <br />Water Monitoring Sites; and the Table of Contents of Appendices B <br />through E have all been revised to correlate the old site (and map) name <br />• to the new (Paradox) computer name. The new computer name will be used <br />throughout the following text. <br />1 <br />