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• Introduction <br />The information assembled in this 1991 Annual Hydrology Report (AHR) includes data <br />collected from approved monitoring sites established at Peabody Coat Company's (PCC) <br />Seneca II-LI Mine (State Permit No. C-82-057). Locations of monitoring sites discussed in <br />[his report can be found by referring to Exhibit 7-1, Hydrology Monitoring Map. <br />All references to 7991 will be for Yater Year 1991 (October 7, 1990 through September 30, <br />7991) 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 1991. <br />Field conductivity and pH meters were calibrated prior to each days use. The conductivity <br />meter is calibrated using a 0.07 molar potassium chloride solution with an electrical <br />conductivity of 1413 umhos/c m. 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 found in water quality reports are <br />not corrected for 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 />no[ 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 = cell 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 />r = rate of conductivity increase per °L, assume 0.02 (i.e., 2 percent) for most <br />dilute solutions <br />This formula is from "Standard Methods far the Examination of eater end was[ewa[e r", <br />American Public Health Association, e[ al., 1985, Pg. 79. This formula differs from that <br />• given in past AHR's and should he used for the temperature correction of all field <br />conductivities for the Seneca II-W Nine collected prior to October 1, 1989. Field <br />1 <br />