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Another commenter expressed concern concerning the interplay between this rule and those already in effect for diesel gases. This commenter expressed concern that, in addition to complying with the interim and ultimate dpm concentration limits, mine operators sugar skull colorful all over printed hawaiian shorts can be required to comply with a concentration limit that considers the additive effect of diesel particulate matter and the principal

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charges may require that equipment be operated at slower speeds. Roof management problems resulting from the accelerated drying out of strata may require a reassessment of the mine’s roof management plan, similar to its roof bolting practices. Vehicle operator area-of-view and visibility issues might be addressed by instituting new visitors controls, requiring slower speeds, and use of window washers. For these reasons, MSHA does not wish to explicitly deny operators a specific kind of engineering management because in some circumstances an adjustment to customary mining practices might have to be made. Some commenters asserted that implementation of certain dpm control measures could create different, unrelated well being or security issues. One example given concerned the complications and safety trade-offs of accelerating ventilation to regulate dpm concentrations. The increased ventilation would are inclined to dry out roadways, causing increased problems with respirable silica bearing dust exposure. This drawback, would, in flip, require utility of larger quantities of water on the roadways for dust management, which, in turn, would sugar skull colorful all over printed hawaiian shorts create traction problems for automobiles. Increased air flow may also accelerate the drying out of sure roof strata, creating roof management issues. Another commenter nervous that enclosed cabs can cut back an gear operator’s subject-of-view, and dust or glare on home windows can obscure visibility, probably creating security problems. In order for MSHA to find out the reasonableness of a mine operator’s request for approval underneath, sure details relating to the work have to be provided. These embody the kinds of inspection, upkeep or repair actions planned, the places of such actions, the dpm concentrations at these areas, the reasons why engineering controls wouldn’t be possible, the anticipated frequency of those actions, the anticipated number of miners involved, and the safeguards the mine operator will employ to reduce dpm exposures. These factors will have a tendency to alter over time because the mine develops, as new equipment or procedures are launched, as ventilation system parameters change, and so forth. MSHA believes that an annual updating of those factors is necessary to insure that approval is granted solely where justified by the actual circumstances.

MSHA disagrees with these interpretations of the rule. The solely impression of the rule relative to work hours is the aforementioned dedication of “average eight-hour equal full shift airborne focus” for dpm-uncovered miners whose work shifts exceed eight hours. Although the Agency has no ideas for a more clear formulation, it’s going to endeavor to make clear this matter further for operators in its compliance information. Concentration limit expressed as an “average eight-hour equivalent full shift airborne concentration.” MSHA acknowledges that work shifts longer than eight hours are frequent within the underground steel and nonmetal mining business. It is for that reason that MSHA expressed its concentration limit as an “average eight-hour equivalent full shift airborne focus.” Health-associated requirements for airborne contaminants are typically established on the basis of an eight-hour work shift. Standard industrial hygiene practice, and MSHA’s previous follow for metal and nonmetal well being sampling, involve adjusting the actual measured focus of an airborne contaminant to an eight-hour equivalent concentration when work shifts are longer than eight hours. This adjusts an exposure occurring over an extended workshift or hours to allow a legitimate comparability to a longtime exposure restrict that is primarily based on an -hr workshift.

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