Page:United States Statutes at Large Volume 83.djvu/790

 PUBLIC LAW 91-173-DEC. 30, 1969

762

Reduction schedule, establishment. Ante,

p. 745.

"MRE instrument."

" A v e r a g e concentration."

[83 STAT.

entitle any operator to an extension of time beyond eighteen months from the date of enactment of this Act to comply with the 3.0 milligram standard established by paragraph (1) of this subsection, or beyond seventy-two months from the date of enactment of this Act to comply with the 2.0 milligram standard established by paragraph (2) of this subsection. (c) Any application for an mitial or renewal permit made pursuant to this section shall contain— (1) a representation by the applicant and the engineer conducting the survey referred to in paragraph (2) of this subsection that the applicant is unable to comply with the standard applicable under subsection (b)(1) or (b)(2) of this section at specified working places because the technology for reducing the concentration of respirable dust at such places is not available, or because of the lack of other effective control techniques or methods, or because of any combination of such reasons; (2) an identification of the working places in such mine for which the permit is requested; the results of an engineering survey by a certified engineer of the respirable dust conditions of each working place of the mine with respect to which such application is filed and the ability to reduce such dust to the level required to be maintained in such place under this section; a description of the ventilation system of the mine and its capacity; the quantity and velocity of air regularly reaching the working faces; the method of mining; the amount and pressure of the water, if any, reaching the working faces; the number, location, and type of sprays, if any; action taken to reduce such dust; and such otner information as the Panel may require; and (3) statements by the applicant and the engineer conducting such survey, of the means and methods to be employed to achieve compliance with the applicable standard, the progress made toward achieving compliance, and an estimate of when compliance can be achieved. (d) Beginning six months after the operative date of this title and from time to time thereafter, the Secretary of Health, Education, and Welfare shall establish, in accordance with the provisions of section 101 of this Act, a schedule reducing the average concentration of respirable dust in the mine atmosphere during each shift to which each miner in the active workings is exposed below the levels established in this section to a level of personal exposure which will prevent new incidences of respiratory disease and the further development of such disease in any person. Such schedule shall specify the minimum time necessary to achieve such levels taking into consideration present and future advancements in technology to reach these levels. (e) References to concentrations of respirable dust in this title means the average concentration of respirable dust if measured with an M R E instrument or such equivalent concentrations if measured with another device approved by the Secretary and the Secretary of Health, Education, and Welfare. As used in this title, the term "MRE instrument" means the gravimetric dust sampler with four channel horizontal elutriator developed by the Mining Research Establishment of the National Coal Board, London, England. (f) For the purpose of this title, the term "average concentration" means a determination which accurately represents the atmospheric conditions with regard to respirable dust to which each miner in the active workings of a mine is exposed (1) as measured, during the 18

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