Laserfiche WebLink
• <br />Introduction <br />The information assembled in this 2007 Annual Hydrology Report (AHR) <br />includes data collected from approved monitoring sites established at <br />Seneca Coal Company's (SCC) Seneca II-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). In <br />addition, NPDES ponds and surface water sites are located in Figures 1 <br />and 2, Appendix A. <br />All references to 2007 (or to "this year") will be for Water Year 2007 <br />(October 1, 2006 through September 30, 2007) 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 II-W in August 1990. The last <br />of the coal at Seneca II-W was removed in January 2006. <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, lyay 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 ParadoxT"' water quality database. Th is 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 />