Workbook for Designated Substance Assessments
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366-BPV-01-IMOT © 2024, Workplace Safety & Prevention Services (WSPS)
1 877 494 WSPS (9777) | 905 614 1400 | WSPS.CA
The Section III worksheets that follow suggest a three stage approach to the assessment program.
They include:
1. Collection and analysis of relevant information
2. Walk through survey of the workplace
3. Follow up investigations as necessary
Note: Air Sampling
Air sampling may be necessary where it is not possible to immediately determine the extent, or even the
existence, of airborne concentrations of a substance. This quantifies airborne contamination, if any, and
the findings can be used to assess the adequacy of existing or proposed controls.
Measuring airborne concentration must be performed by, or under the direction of, a person who is
qualified because of knowledge, training and experience in industrial hygiene practice, as outlined in
O. Reg. 490 Section 24.
In addition, in Section 25 the results of air monitoring must be posted in the workplace for no less than
14 days, and a copy of the results must be given to the joint health and safety committee and kept for no
less than five years.
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