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Technical Revision (TR) 47 was approved on May 4, 2010. This TR reduced <br />the hydrologic monitor plan, both in the number of monitoring sites, <br />frequencies and analytical parameter lists. Details of the new monitor <br />plan may be found in the Yoast PAP, Tab 15, pages 31-33. Tables 15-8 and <br />15-9 in the PAP have been revised to reflect these changes. In addition, <br />the Surface and Ground Water Parameter Lists (Tables 15-4, 1574a, 15-5 <br />and 15-5a in the PAP) have also been changed. In general, new short and <br />long surface and ground water parameter lists were created. Those <br />parameter lists are discussed and provided later in this AHR. Monitoring <br />at certain surface and ground water sites was suspended until one year <br />prior to final bond release. Other ground water wells were approved to <br />be permanently abandoned. Monitoring frequencies for stream sites have <br />been changed from triannual to biannual. Monitoring frequencies for <br />alluvial wells have been changed from biannual (or triannual) to annual. <br />Monitoring frequencies for bedrock wells will remain annual. These <br />monitoring frequencies will be increased to their previous frequencies <br />one year prior to final bond release. <br />Meteorological Data <br />No meteorological data is collected at the Yoast Mine. SCC maintains a <br />weather station (wind speed and direction, temperature and <br />precipitation) at its adjacent Seneca II-W Mine. The reader is referred <br />to that AHR, Appendix B. Peabody Energy also maintains a precipitation <br />gage at its adjacent Peabody Sage Creek Mine. Data from that gage for <br />this year are included on Table 1. A summary of all data collected at <br />that gage is provided here in Table 2. <br />Data from the National Climatic Data Center's Hayden Station is used <br />here to evaluate the precipitation trend. These data are provided in <br />Appendix B of the Seneca II-W AHR. For this year, 17.85 inches of <br />precipitation was measured, which is 0.51 inches (3%) above the 1971- <br />2000 average, 17.34 inches. The months of December, March, April, May, <br />June and August were above average. Snowpack runoff, as estimated by <br />totaling November through March precipitation values, was 6.27 inches, <br />which was 0.91 inches (13%) below the 1971-2000 average, 7.18 inches. <br />2