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Introduction <br />TRe information assembled in this 1999 Annual tlydxology Report (AtlR) includes data <br />collected from approved monitoring sites established at Seneca Coal Company's (SCC) Yoast <br />!line (State Permit No. C-94-082). Locations of moni torinq ai tas discussed in this report <br />can be found by referring to Exhibit 7-1, Hydrology Monitoring Map, which may ba Eound in <br />the Yoast Mina Permit Application Package (PAP). <br />All references to 1999 (or to "this year") will be for 5iater Year 1999 IOCtoDer 1, 1998 <br />through September 30, 1999) anises otherwise noted. All tables referred to in the <br />following text can be found in Appendix A. In addition, a table of contante for Appendix <br />A rs given at the beginning of that appendix. <br />The Yoast Mine permit rent into effect on August S, 1995. Overburden removal began in <br />October 1996. Figure 1 shows the azea mined this year. Mining thin year has occurred in <br />the Armand Oxaw basin (NPDE910) and the Gxaeey Creak basin (NPDESII). <br />• Field conductivity aM ptl meters were calibrated prior to each day's use. Tha <br />conductivity meter ie calibrated uainq a potnaeium chloride solution with an electrical <br />conductivity in the 1000 to 3000 umhos/® range. The ptl meter ie calibrated using NHS <br />traceable buffers rich pH values of 7 and 10. Lab analyses have been performed by ACZ <br />Laboratory in Steamboat Springs, Colorado ainee May 31, 1983. ACZ Laboratory performs all <br />analyses by %PA or equivalent methods. Samples aze delivered the day of collection to the <br />lab in an iced cooler. <br />SCC instituted in 1995 a new moni torinq site numbering eye tam for its new Paradox" water <br />quality database. This new •yatem ie detailed in Table A. For convenience sake, this <br />table hoe been placed at the end of the Table of contante (sae previous page). <br />A new NFDES amendment went into affect on September 1, 1999. This amendment authorized a <br />reduction in monitoring frequency (from weakly to monthly) at e:ie ling Pointe 010 and 011. <br />It also authorized the dierhazge of proposed eointa 012, 013, and 014. A copy of this <br />ame~.+..e..t has bem provided to the CDMG. <br />• <br />1 <br />