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Introduction <br />• The information assembled in this 1999 Annual Hydrology Aeport (AHR) includes data <br />collected from approved monitoring sites established at Seneca Coal Company's ($CC) Seneca <br />II-W Mine (State Permit No. C-82-057). Locations of monitoring sites discussed in this <br />report can be found by referring to Exhibit 7-1, Hydrology Monitoring Map, xhich may be <br />found in the Seneca II-W Permit Application Package (PAP). <br />~ All references to 1999 (or to "this year") will be for Water Yeas 1999 (October 1, 199E <br />i <br />through September 30, 1999) unless otherwise noted. All tables referred to in the <br />following tart can be found in Appendix A. In addition, a table of contents for Appendix <br />A is given at the begiFVFinq of that appendix. Figure 1 (Appendix A) shore the azea mined <br />in 1999. Hini ng began at Seneca II-W in August 1990. <br />Field conductivity and pH meters were calibrated prior to each day's use. The <br />conductivity meter is calibrated using a potassium chloride solution with an electrical <br />conductivity in the 1000 to 3000 umhos/® range. The pH meter is calibzated using NBS <br />traceable buffers with pH values of 7 and 10. <br />Prior to October 1, 198 9, all field conductivity values collected at Seneca II-W <br />monitoring Bites were not corrected for temperature (i.e., 25° C). Field conductivity <br />data starting on October 1, 1989 wets temperature correctetl to 25° C. The formula for <br />correcting non-corrected conductivity data may be found zn the 1990 through 1992 AFIRE. <br />5CC instituted in 1995 a nex monitoring site numbering system for its nex Paradox"' rater <br />quality database. This ner system ie detailed in Table A. For convenience sake, thin <br />table has been placed at the end of the Table of Conran to (sea pravioue page). In <br />addition, Table 3, Summary of Ground Water Monitoring Wells: Table 10, S++"'+'~+-y of Surface <br />Water Monitoring Sites; and the Table of Contents of Appendices C through E have all been <br />revised to correlate the old site (and map) name to the new (Paradox) computes name. The <br />ner computer name rill be used throughout the following text. <br />After their zevier of last year's Seneca II/ZI-W ARES, the CDMG made several sugges tione <br />to be incorporated into this yeaz'a AFIRE. The first comment rae about updating the ground <br />and surface rater standards tables presented in Tables 5 and 9. SCC reviexed the nex <br />Colorado Department of Health's (CDOH) standards and compared them to the AHR tables. No <br /> <br />