2010-03-22_REPORT - C1994082 (2)

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Introduction The information assembled in this 2009 Annual Hydrology Report (AHR) includes data collected from approved monitoring sates established at Seneca Coal Company's (SCC) Yoast Mine (State Permit No. C-94-082). Locations of monitoring sites discussed in this report can be found by referring to Exhibit 7-1, Hydrology Monitoring Map, which may be found in the Yoast Mine Permit Application Package (PAP). In addition, NPDES ponds and surface water sites are located in Figures 1 and 2, Appendix A. A map of ground water monitor wells may be found in Figure 3. All references to 2009 (or to "this year") will be I-or Water Year 2009 (October 1, 2008 through September 30, 2009) 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. The Yoast Mine permit went into effect on August 8, 1995. Overburden removal began in October 1996 in the Grassy Creek basin and in 2000 in the Sage Creek basin. The last of the coal at the Yoast Mine was removed in February 2006. Field conductivity and pH meters were 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 NBS traceable buffers with pH values of 7 and 10. Lab analyses have been performed by ACZ Laboratory in Steamboat Springs, Colorado since May 31, 1983. ACZ Laboratory performs all analyses by EPA or equivalent methods. Samples are delivered the day of collection to the lab in an iced cooler. SCC instituted in 1995 a new monitoring site numbering system for its new ParadoxTM 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). 1