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• Introduction <br />The information assembled in this 1990 Annual Hydrology Report (AHR) includes data <br />collected from approved monitoring sites established at Peabody Coal Company~s (PCC) <br />Seneca 11 Mine (State Permit No. C-80-005). Locations of monitoring sites discussed in <br />this report can be found by referring io Exhibit 7-2, Hydrology Monitoring Site Location <br />Map. <br />All references to 1990 will be for Water Year 1990 (October 1, 1989 through September 30, <br />1990) unless otherwise noted. ALI 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 />eetueen October, 1989, and September 1490, mining progressed as indicated on Figure 1 <br />(Appendix A). From Figure 1 it is evident [hat strip mining is being conducted <br />simultaneously in two areas. In the southern permit area, the Wadge coal seam is being <br />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 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 pX values of i 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 Narch 1, 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 />K = (Km(Q) / (1 a r (t°•25°)) <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 C <br />1 <br />