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• Introduction <br />1'he informatics a9eembled in ibis 1995 Annual 9ydrology lieport (ABIU includes data <br />emllected from approved monitoring sites astabllabed at eeneca Coal Compatry's (SCC) Seneca <br />II Mine (state Permit No. C-BO-005). Locations of monitoring sites discussed in this <br />report can be laun6 by referring to Exhibit 7-2, 9ydrology Honitoring Site Location Maps <br />which may be found in the Seneca II Permit Application Package. <br />All references to 1995, or to "this year^, will bn for water ]fear 1995 (Ottobez 1, 1994 <br />through September 30, 1995) unless otherwise noted. All tables referred to in the <br />follouinq text can be found Sn Appendix A. In addition, a table of contents for Appendix <br />A is given at the beginning of that appendix. <br />eetveen October, 1994 and September, 1995, mining progressed ae indicated by the shaded <br />areas on FSqure 1 (Appendix A). From Figure 1 it is evident that strip mining is being <br />conducted simultaneously in tvo areas. In the southern permit area, the Madge coal seam <br />is being mined, and Sn the northern permit area the wolf Creels seam Sa being mined. <br />• <br />Field conduetivi ty and pH meters are calibrated prior to each day's vas. The conductivity <br />meter is calibrated using a potassium chloride solution with an electrical conductivity in <br />the 1000 to 3000 umhos/~ range. The pe meter Ss calibrated using NB9 traceable buffers <br />with pN values of 7 and 10. <br />Prior to October 1, 1989, all field conductivity valves collected at Seneca II monitoring <br />sites were not corrected for teaperature (1.e., 25° C). Field conductivity data starting <br />on October 1, 1989 were teaR+erature wrrected to 25° C. The formula for correcting non- <br />corrected conductivity data may De frond in the 1990 through 1992 A83(a. <br />9CC has instituted a new monitoring site numbering system for its nee Paradox" eater <br />quality data base. Tbia nee system is detailed in Table A. For wnvenienee sake, thin <br />table has been placed at the end of the Table of Contents (see previous page). In <br />addition, Table 3, Summary of Ground water Monitoring Neils; Table 13, S••^""°*'y of Surface <br />water Monitoring Sites; and the Table of Contents of Appendices C thrrntgh G have all been <br />. revised to correlate the old site (and map) name to tha ner (Paradox) computer name. The <br />' ~ nee computer name will be used throughout the follovinq text. <br />1 <br />