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<br />the author candidly presents references which report that ground mass and related <br />subsidence movements along faults can be "out of proportion to the extent and thickness <br />of the extraction". Angles of draw can vary significantly from the normal unfaulted angle <br />and subsidence can manifest itself at accelerated rates. As in volume I of the application, <br />the author than suggests that BRL be permitted to take an exploratory "wait and see" <br />approach to mining through the fault trace. The Division is required to render a finding <br />regarding the likelihood that BRL's proposed mine plan will preclude detrimental impacts <br />of subsidence. The methodology for ground control and monitoring of ground mass and <br />subsidence response aze inadequate to allow the Division to find the plan adequate. The <br />application should be amended to provide specific ground control methods and <br />monitoring methods to be implemented in order to control detrimental impacts of <br />subsidence. <br />If you have any questions, please call me. <br />Sincerely, <br />Joseph J. Dudash (/ <br />Environmental Protection Specialist <br />cc: Jim Stover P.E. (J.E. Stover & Associates) <br />c:\wp61\bowie2\tr8 adeq 1 <br />4 <br />