(b) Rules of the commission shall establish the concentration of exhaust gas, stated as a percentage of an exposure limit, that when present will require changes to be made in the use of diesel-powered equipment or the methods of mine ventilation, or will require other modifications in the mining process.
(c) Rules of the commission shall provide for the remedial action to be taken if the concentration of any of the gases listed in subsection (a) of this section exceeds the exposure limit.
(d) In addition to the other maintenance requirements required by this article, rules of the commission shall provide for service, maintenance and tests which are specific to an engine's fuel delivery system, timing or exhaust emissions control and conditioning system.
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