S-2.1, r. 13 - Regulation respecting occupational health and safety

Section 306 Disposition versions

2023-07-25

306. Method and frequency of atmospheric readings: Where risks associated with the atmosphere are identified, readings of the oxygen concentration in the enclosed area as well as of inflammable gases and vapours and contaminants measurable by direct reading and likely to be present in the enclosed area or nearby shall be made:

(1)  before workers enter the enclosed area and, subsequently, on a continuous or periodic basis, according to the evaluation of the danger made by a qualified person;

(2)  if circumstances modify the internal atmosphere of the enclosed area and result in the evacuation of workers due to the fact that the quality of the air no longer complies with the standards set out in subparagraphs 1 to 3 of the first paragraph of section 302;

(3)  if the workers leave the enclosed area and the work site, even momentarily, unless continuous monitoring is maintained;

(4)  when an atmospheric risk other than those identified in accordance with section 300 is identified and likely to modify the internal atmosphere of the confined space, such as the introduction of a product or material that may emit toxic or flammable gases or vapours.

The readings shall be taken in such a manner as to obtain an accuracy equivalent to that obtained following the methods described in section 44 or, when these measures cannot be applied, by following another recognized method.

O.C. 885-2001, s. 306; O.C. 1120-2006, s. 7; O.C. 43-2023, s. 9.

2012-09-01

306. Method and frequency of readings: Readings of the oxygen concentration in the enclosed area as well as of inflammable gases and vapours and contaminants measurable by direct reading and likely to be present in the enclosed area or nearby shall be made:

(1)  before workers enter the enclosed area and, subsequently, on a continuous or periodic basis, according to the evaluation of the danger made by a qualified person;

(2)  if circumstances modify the internal atmosphere of the enclosed area and result in the evacuation of workers due to the fact that the quality of the air no longer complies with the standards set out in subparagraphs 1 to 3 of the first paragraph of section 302;

(3)  if the workers leave the enclosed area and the work site, even momentarily, unless continuous monitoring is maintained.

The readings shall be taken in such a manner as to obtain an accuracy equivalent to that obtained following the methods described in section 44 or, when these measures cannot be applied, by following another recognized method.

O.C. 885-2001, s. 306; O.C. 1120-2006, s. 7.