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Introduction The information assembled an this 1999 Annual Hydrology Report (AMR) includes data collected from approved moni toning sites established at Seneca Coal Company's (SCC) Seneca II Mine (State Permit No. C-HO-005). Locations of monitoring sites discussed in this report can be fountl by referring to Exhibit 7-2, Hydrology Monitoring Site Location Map, which may be found in the Seneca II Permit Application Package (PAP). All references to 1999, or to "this year", will be for Water Year 1999 (October 1, 1998 through September 30, 1999) 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. For this year, mining progressed as indicated by the shaded areas on Figure 1 (Appendix A). A small amount of Wedge coal was zemovad this year. Field conductivity and pH meters are 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 NHS traceable buffers with pH values of 7 and 30. Prior to October 1, 1989, all field conductivity values collected at Seneca II 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 eys rem for its new Paradoxn' 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 9, Summary of Surface Water Monitoring Sites; and the Table of Contents of Appendices a through E have all been revised to correlate the old si to (and map) name tc the new (Paradox) computer name. The new computer name will be used throughout the following text. A new NPDES amendment wen[ into effect on September 1, 1999. This amendment authorized a reduction in monitoring frequency (from weekly to monthly) at Points 002, 004, and 008. A copy of this amendment has been provided to the CDMG.