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Designated Substances Surveys
A “designated substance” is defined in the Occupational Health and Safety Act (OHSA) as “a biological, chemical or physical agent or combination thereof prescribed as a designated substance to which the exposure of a worker is prohibited, regulated, restricted, limited or controlled”.
Ontario prescribes the following eleven substances as a “designated substance”
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Acrylonitrile, Arsenic, Asbestos, Benzene, Coke Oven Emissions, Ethylene Oxide, Isocyanates, Lead, Mercury, Silica and Vinyl Chloride
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Section 30 of the OHSA requires a building owner to determine if there are any designated substances present at a project site prior to construction or demolition activities. Sections 30(2), (3) and (4) require the Owner and constructors for a project to provide the findings as part of the tendering information for any tendered project or to prospective contractors (and subcontractors) of a project before entering into a binding contract.
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What we do?
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Perform Designated Substances Surveys (DSSs) to determine the presence, location, condition and quantities of designated substances and other hazardous materials contained within the building.

When do you need a DSS?
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Section 30(1) of the OHSA requires a building owner to determine if there are any designated substances present at a project site prior to construction or demolition activities.
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Sections 30(2), (3) and (4) require the Owner and constructors for a project to provide the findings in this report as part of the tendering information for any tendered project or to prospective contractors (and subcontractors) of a project before entering into a binding contract.