On Board Trains Occupational Health and Safety Regulations

4.2 (1) Subject to subsections (2) and (3) and section 4.3, the level of sound in a work place shall be less than 87 dB.

(2) Subject to subsection (3), where it is not reasonably practicable for an employer to maintain the level of sound in the work place at less than 87 dB, no employee shall be exposed in any 24 hour period

• (a) to a level of sound referred to in Column I of an item of the schedule to this Part for a number of hours exceeding the number set out in Column II of that item; or

• (b) to a number of different levels of sound referred to in Column I of an item of the schedule to this Part, where the sum of the following quotients exceeds 1:

  • (i) the number of hours of exposure to each level of sound

  divided by

  • (ii) the maximum number of hours of exposure per 24 hour period set out in Column II of that item.

(3) Where it is not reasonably practicable for an employer to maintain the exposure of an employee to a level of sound at or below the levels referred to in subsection (1) or (2), the employer shall

• (a) make a report in writing to the regional safety officer setting out the reasons why the exposure cannot be so maintained; and

• (b) provide every employee entering the work place with a hearing protector that

  • (i) meets the standards set out in CSA Standard Z94.2-M1984, Hearing Protectors, the English version of which is dated June, 1984 and the French version of which is dated February, 1985, and

  • (ii) reduces the level of sound reaching the employee’s ears to less than 87 dB.