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<br />The information assembled in this 1998 Annual Hydrology Report (AHR) Includes data <br />collected from approved monitoring altea established at Seneca Coal Company`s (SCC) Seneca <br />II Mine (State Permit No. C-80-005). Locations of monitoring Bites discussed in this <br />report can be found by referring to Exhibit 7-2, Hydrology Monitoring Site Location Map, <br />which may be found in the Seneca II Permit Application Package (PAP). All references to <br />1998, or to "this yeaz", will be for Water Year 1998 (October 1, 1997 through September <br />30, 1998) unless otherwise noted. All tables referred to in the following text can be <br />found in Appendix A. In addition, a table of contents for Appendix A is given at The <br />beginning of that appendix. <br />For this year, mining progressed as indicated by the shaded areas on Figure 1 (Appendix <br />A). The last of the Wolf Creek coal ras removed in August 1997. No Wedge coal ras mined <br />this Water Year, although some was removed later in 1998. <br />Field conductivity and pH tuatara axe calibrated prior to each day's use. The conductivity <br />metes is calibrated using a potassium chloride solution with an electrical conductivity in <br />• the 1000 to 3000 umhos/cm range. The pH meter is calibrated using NBS traceable buffers <br />with pH values of 7 and 10. Prior to October 1, 1989, all field conductivity values <br />collected at Seneca II monitoring sites rate not corrected fox temperature li.e., 25° C). <br />Field conductlvi ty data starting on October 1, 1959 were temperature corrected to 25° C. <br />The formula for correcting non-corrected conductivity data may be Pound in the 1990 <br />through 1992 AHRS. <br />SCC instl toted in 1995 a new monitoring site numbering system far its ner Paradox"+ rater <br />quality database. This ner system is detailed in Table A. For convenience sake, this <br />table has been placed at the end of the Table o£ Cantente (Bee previous page). In <br />addition, Table 3, S++mm=*y of Ground Water Monitoring walla; Table 9, Summary of Surface <br />Water Monitoring Sites; and the Table of Contents of Appendices B through E have all been <br />revised to correlate the old site (and map) name to the ner (Paradox) computer name. The <br />ner computer name will be used throughout the following tezt. <br />Several changes to the hydrologic monitoring program rare made last year in Permit Renewal <br />No.3, rhich was approved on June 19, 1997. Those changes rare discussed rn the <br />• Introduction to the 1997 AHR. The new monitoring program is nor auvmuirized in table form <br />