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Introduction <br />The information assembled in this 1993 Annual Hydrology Report (AHR) includes date <br />collected from approved monitoring sites established at Peabody Western Coal Company's <br />(PWCC) Seneca 11 Mine (State Permit No. C-80-005). Locations of monitoring sites <br />discussed in this report can be found by referring to Exhibit 7-2, Hydrology Monitoring <br />Site Location Map. <br />All references to 1993 will be for Water Year 1993 (October 1, 1992 through September 30, <br />1993) 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 1992 and September 1993, 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 en 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 II Mine Meteorological Station <br />using a Belf ort Weighing Bucket Rain Gage. Daily precipitation data for 1993 are <br />presented in Table 1. Total monthly precipitation data collected since 1981 are presented <br />in Table 2 (Append i~x A). Where indicated, date from the O.S. Weather Service - Hayden <br />Station were used. Temperature, wind speed end direction date ere presented in Appendix <br />B. The data in Appendix B is from the Seneca 11-W Mine Meteorological Station located <br />1 <br />