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• <br />Introduction <br />The informstion assembled in this 1994 Annual Hydrology Report (AHR) includes data <br />collected from approved monitoring sites established at Seneca Coel Company~s (SCC) Seneca <br />l1-Y Mine (State Permit Mo. C-82-057). Locations of monitoring sites discussed in this <br />report can be found by referring to Exhibit 7-1, Hydrology Monitoring Map. Please take <br />this map from the 1993 AHR and insert into this AXR. <br />All references to 1994 will be for Yater Year 1994 (October 1, 1993 through September 30, <br />1994) unless otherwise noted. All tables referred to in the following text can be found <br />in Appendix A. In addi Lion, 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 1994. <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 [0 3000 umhos/cm range. The pH meter is calibrated using YBS traceable buffers <br /> with pH values of 7 and 10. <br />• Prior to October t, 1989, all field conductivity values collected at Seneca ]I-Y <br /> monitoring sites were not corrected for temperature (i.e., 25° C). Field conductivity <br />date starting on October 1, 1989 were temperature corrected to 25° C. The formula for <br />correcting non-corrected condueti vity date may be found in the 1990 through 1992 AHRS. <br />SCC committed to the abandonment of eleven monitoring wells (GY-52Y-1Y, 10V, 2YC, 2V, 20V, <br />3EY, 3EI, 3EYC, SY, SOY, and 10Y) in Teehniesl Revision 21 approved February 17, 1994. <br />These Yells have been previously dropped from the monitoring program due to faulty grout <br />seals. All these Yells were abandoned in September, 1994. Table 3 (Appendix A) fiats the <br />grid coordinates, depth, elevation, and diameters for each of these Yells. Drill hole <br />abandonment forms (which presents the date abandoned and type of abandonment material) are <br />included in Appendix A1. <br />Meteorological Date <br />Precipitation data at the Seneca 11-Y Mine has been collected since August 28, 1989. <br />Precipitation data is collected from a 8elfort Yeighing Bucket Rain Gage situated adjacent <br />• to Site SY-S2Y-FG1. Data for the 1994 Yater Year may be found in Table 1 (Appendix A). <br />1 <br />