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Introduction <br />The information assembled in this 1993 Annual Hydrology Report (AHR) includes data <br />collected from approved monitoring sites established at Peabody Vestern Coal Company's <br />(PNCC) Seneca 11•Y Mine (State Permit No. L-82-057). Locations of monitoring sites <br />discussed in this report can be found by referring to Exhibit 7-1, Hydrology Monitoring <br />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. Figure 1 (Appendix A) shows the area mined in 1993. <br />Field conductivity and pH meters were calibrated prior to each days 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 />• <br /> Prior to October 1, 1989, all field conductivity values collected at Seneca II-u <br /> monitoring sites were not corrected for temperature (i.e., 25° C). Field conductivity <br /> data starting on October 1, 1989 were temperature corrected to 25° C. The formula for <br /> correcting non-corrected conductivity data may be found in the 1990 through 1992 AHRs. <br />Meteorological Da[a <br />Precipitation data at the Seneca 11-W Mine has been collected since August 28, 1989. <br />Precipitation data is collected from a Belfort Weighing Bucket Rain Gage situated adjacent <br />to Site SV-52N-FC1. Data for the 1993 Water Year may be found in Table 1 (Appendix A). <br />To provide a basis far comparison of past years precipitation data, data from PWOC's <br />adjacent Seneca II Mine has been included in Table 2 (Appendix A). The Seneca II Mine <br />precipitation station is located approximately seven miles northeast of the center of the <br />Seneca II-W Mine. Climatic conditions are similar between the Cuo mines. Temperature, <br />wind speed, and direction data from the Seneca 11-N Mine are presented in Appendix B. <br />• Data from the National Climatic Data Center for the Hayden Station uas used to evaluate <br />the precipitation trend. For Yater Year 1993, 15.48 inches of precipitation uas measured, <br />1 <br />