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mined coal in 2005 to 65.9 acre-feet per one million tons in 2006. <br />2006 Bi-Annual Subsidence Reports <br />No problems were noted with either the visual inspections or the subsidence monitoring programs. In both <br />the Spring 2006 and Fall 2006 visual surveys, it was stated that the majority of subsidence cracks observed <br />in 2004 and 2005 have healed. It was also observed that there appear to be fewer subsidence cracks from <br />the B-seam mining than from the D-seam mining. There were no observed impacts to any hydrologic <br />monitoring stations from subsidence due to mining activities. <br />The data for the subsidence monument surveys were also provided. As in previous years, the data show <br />that the subsidence magnitudes are less than the predicted maximum subsidence magnitudes for double- <br />seam mining. <br />If you have any questions, please call me. <br />Sincerely, <br />JJ1 <br />tsep4hJ. ash <br />Environmental Protection Specialist <br />cc: Jim Stover P.E. (J.E. Stover & Associates) <br />c: \word\bowie2\2006annrptadeq 1 <br />2