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• Introduction <br />The information assembled in this 1992 Annual Hydrology Report (AHR) includes data <br />collected from approved monitoring sites established at Peabody Western Coal Company~s <br />(PNCC) Seneca II-Y Mine (State Permit No. C-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 1992 will be for Neter Yeer 1992 (October 1, 1991 through September 30, <br />1992) 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 et the beginning <br />of that appendix. Figure 1 (Appendix A) shows the area mined in 1992. <br /> Permit Revision 1 for the Seneca II-N Mine was put into effect on October 4, 1991. This <br /> version substantially changed the hydrological monitoring program. This new program is <br /> detailed in Tab 15 of the Seneca II-N Permit Application Paekege (PAP). In addition to <br /> changes in monitoring frequencies, new wells end stream sites were added. Those new sites <br />• will be discussed in t he following ground water and surface water sections. <br />Field conduetivi[y end pX meters were calibrated prior to each days use. The conductivity <br />meter is calibrated using a 0.01 molar potassium chloride solution with an electrical <br />conductivity of 1413 umhos/cm. The pH meter is calibrated using NBS traceable buffers <br />with pH values of 7 and 10. <br />Prior to October 1, 1989, ell field conductivity values found in water quality reports are <br />not corrected far temperature (i.e., 25° C). Field conductivity data from October 1, 1989 <br />to March 7, 1990 were collected using a YelLOw Springs Instrument Model 33 Meter that does <br />not compensate for temperature. That data has been corrected to 25° C using the following <br />formula: <br />where: <br />K =conductivity at 25° C <br />Km = measured conductivity at t° <br />C =tell constant = true conductivity of a standard/measured conductivity of a <br />• standard (assume 1.0 if cell constant is not given) <br />t° = temperature at which Km was determined, in °Celcius <br />