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• <br />Introduction <br />The information assembled in this 1994 Annual Hydrology Report (AHR) includes data <br />collected from approved monitoring sites established at Seneca Coal Company's (SCC) Seneca <br />lI Mine (State Permit Mo. C-BO-005). Locations of monitoring sites discussed in this <br />report can be found by referring to Exhibit 7.2, Hydrology Monitoring Site Location Map. <br />Please remove the map from the 1993 AHR and place into this one. <br />All references to 1994 will be for Water Year 1994 (October 1, 1993 through September 30, <br />1994) unless otherwise noted. All tables referred to in the following text can be found <br />in Appendix A. In addition, a table of contents for Appendix A is given at the beginning <br />of that appendix. <br />Between October, 1993 end September, 1994, mining progressed as indicated by the shaded <br />areas on Figure 1 (Appendix A). From Figure 1 it is evident that strip mining is being <br />conducted simultaneously in two areas. In the southern permit area, the wadge coal seam <br />is being mined, and in the northern permit area the wolf Creek seam is being mined. <br />• Field conductivity and pH meters are calibrated prior to each day's use. The conductivity <br />meter is calibrated using a potassium chloride solution with an electrical conductivity in <br />the 1000 to 3000 umhos/cm range. The pH meter is calibrated using NBS traceable buffers <br />with pH values of 7 and 10. <br />Prior to October 1, 1989, all field conductivity values collected at Seneca II monitoring <br />sites were not corrected for temperature (i.e., 25° C). Field conductivity data starting <br />on October 1, 1989 were temperature corrected to 25° C. The formula for correcting <br />non-corrected conductivity data may be found in the 1990 through 1992 AHRS. <br />Meteorological Data <br />Precipitation data was obtained primarily at the Seneca !I Mine Meteorological Station <br />using a Beltort Weighing Bucket Rain Gage. Daily precipitation data for 1994 are <br />presented in Table 1. Total monthly precipitation data colleeted since 1981 are presented <br />in Table 2 (Appendix A). Where indicated, data from the U.S. Weather Service Hayden <br />Station were used. Temperature, wind speed and direction data ere presented in Appendix <br />• B. The date in Appendix B is from the Seneca II•w Mine Meteorological Sta[ion located <br />1 <br />