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O. Reg. 391/00: DESIGNATED SUBSTANCE - SILICA
filed June 26, 2000 under Occupational Health and Safety Act, R.S.O. 1990, c. O.1
Skip to contentONTARIO REGULATION 391/00
made under the
occupational health and safety act
Made: June 21, 2000
Filed: June 26, 2000
Amending Reg. 845 of R.R.O. 1990
(Designated Substance — Silica)
1. Section 1 of Regulation 845 of the Revised Regulations of Ontario, 1990 is amended by adding the following definition:
“respirable” means that size fraction of the airborne particulate deposited in the gas–exchange region of the respiratory tract and collected during air sampling with a particle size–selective device that,
(a) meets the American Conference of Governmental Industrial Hygienists (ACGIH) particle size–selective criteria, and
(b) has the cut point of 4 microns at 50 per cent collective efficiency.
2. Subsection 4 (1) of the Regulation is revoked and the following substituted:
(1) Every employer shall take all necessary measures and procedures by means of engineering control, work practices and hygiene practices and facilities to ensure that the time–weighted average exposure of a worker to silica is reduced to the lowest practical level and in any event shall not exceed,
(a) in the case of cristobalite and tridymite, 0.05 milligrams silica per cubic metre of air by volume; and
(b) in the case of quartz and tripoli, 0.10 milligrams silica per cubic metre of air by volume.
3. Clause 5 (3) (b) of the Regulation is amended by striking out “dated the 17th day of October, 1983” and substituting “dated June 30, 2000”.
4. Section 11 of the Regulation is revoked and the following substituted:
11. The procedures for monitoring, sampling and determining the concentrations of airborne silica in the atmosphere of a workplace and a worker’s exposure to airborne silica shall be in accordance with standard methods for workplace air sampling and analysis.
5. Paragraph 1 of the Schedule to the Regulation is amended by striking out “as set out in the Code mentioned in section 11” and substituting “in accordance with standard methods for workplace air sampling and analysis”.
6. This Regulation comes into force on September 30, 2000.