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• Introduction The information assembled in this 1992 Annual Hydrology Report (AHR) includes data collected from approved monitoring sites established at Peabody Western Coal Company's (PWCC) Seneca II Mine (State Permit No. C-80-005). Locations of monitoring sites discussed in this report can be found by referring to Exhibit 7-2, Hydrology Monitoring Site Location Map. ALl references to 1992 will be for Water Year 1992 (October 1, 1991 through September 30, 1992) unless otherwise noted. All tables referred to in the following text can be found in Appendix A. In addition, a table of contents for Appendix A is given at the beginning of that appendix. Between October 1991 antl September 1992, mining progressed as indicated by the shaded areas on Figure 1 (Appendix A). From Figure 1 it is evident that strip mining is being conducted simultaneously in two areas. In the southern permit area, the Wadge coal seam is being mined, end in the northern permit area the Wolf Creek seam is being mined. • Field conductivity end pH meters are calibrated prior to each day's use. The conductivity meter is calibrated using a 0.01 molar potassium chloride solution with an electrical conductivity of 1413 umh os/cm. The pH meter is calibrated using NBS traceable buffers wi [h pH values of 7 and 10. Prior to October 1, 1989, all field conductivity values found in water quality reports are not corrected for temperature (i.e., 25° C). Field conductivity data from October 1, 1989 to-March 1, 1990 were collected using a Yellow Springs Instrument Model 33 Meter that does not compensate for temperature. That date has been corrected to 25°C using the following formula: where: K =conductivity a[ 25° C Km = measured conductivity at t° C =cell constant = true conductivity of a standard/measured conductivity of a s tanderd (assume 1.0 if cell constant is no[ given) • t° = temperature at which Km was determined in C 1