Mine Safety and Health Administration September 7, 2005 – Federal Register Recent Federal Regulation Documents

We propose to revise the January 20, 2006 effective date of the existing diesel particulate matter (DPM) final concentration limit of 160 micrograms of total carbon (TC) per cubic meter of air (160TC[mu]g/m3) in the 2001 final rule ``Diesel Particulate Matter Exposure of Underground Metal and Nonmetal Miners,'' published in the Federal Register on January 19, 2001 (66 FR 5706). We are considering staggered effective dates for implementation of the final DPM limit, phased-in over a multi-year period, primarily based on feasibility issues that have surfaced since promulgation of the 2001 final rule. We also propose to delete the existing provision that restricts newer mines from applying for an extension of time for meeting the final concentration limit. In addition we are seeking specific comments and data on an appropriate conversion factor for the final DPM limit, technological implementation issues, and the costs and benefits of this rule. Finally, in this proposed rule, we are interested in comments on the appropriateness of including in a final rule a provision for medical evaluation of miners required to wear respiratory protection and transfer of miners who have been determined by a medical professional to be unable to wear a respirator. Specific questions regarding these issues are discussed within the appropriate sections in the preamble. These questions are italicized for ease of the reader.