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• Introduction <br />The information assembled in this 2002 Annual Hydrology Report (AHR) <br />includes data collected from approved monitoring sites established at <br />Seneca Coal Company's (SCC) Yoast Mine (State Permit No. C-94-082). <br />Locations of monitoring sites discussed in this report can be found by <br />referring to Exhibit 7-1, Hydrology Monitoring Map, which may be found <br />in the Yoast Mine Permit Application Package (PAP). <br />All references to 2002 (or to "this year") will be for Water Year 2002 <br />(October 1, 2001 through September 30, 2002) 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. <br />The Yoast Mine permit went into effect on August 6, 1995. Overburden <br />removal began in October 1996. Mining this year has occurred in the Sage <br />• Creek basin (NPDE512 and NPDESI4). <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. Lab analyses have been performed by ACZ Laboratory <br />in Steamboat Springs, Colorado since May 31, 1983. ACZ Laboratory <br />performs all analyses by EPA or equivalent methods. Samples are <br />delivered the day of collection to the lab in an iced cooler. <br />SCC instituted in 1995 a new monitoring site numbering system for its <br />new Paradox water quality database. This 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). <br />After their review of last year's Yoast AHR, the CDMG made several <br />_ comments in a letter dated December 9, 2002. No response was necessary. <br />1 <br />