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Supervisor fined for role in Woodbridge explosion, fatality

DCN-JOC News Services
Supervisor fined for role in Woodbridge explosion, fatality

NEWMARKET, ONT. — A construction supervisor has been fined $70,000 for his role in a workplace explosion that killed a worker on a Woodbridge, Ont. jobsite three years ago.

Tony Ventrone, at the time a construction supervisor with Infrastructure Coatings (Ontario) Corporation of Concord, Ont., pleaded guilty in the Ontario Court of Justice in Newmarket, Ont. and was convicted Aug. 17.

A Ministry of Labour report recounts that Infrastructure Coatings was contracted by a constructor under contract to the Regional Municipality of York to re-line an underground water chamber with a spray waterproofing as part of a watermain remediation project. The jobsite was at Highway 407 and Islington Avenue in Woodbridge.

Infrastructure Coatings applied the waterproof coating to the chamber in July 2020. A follow-up inspection revealed that a corner of the chamber was spongy and required re-spraying so the company returned and cut out the spongy area.

On Aug. 5, 2020, workers again returned to the site to re-spray the waterproof coating. A worker and a waterstop supervisor acting as a safety watch completed the Confined Space Entry Permit and set up rescue and ventilation equipment prior to the worker entering the chamber to conduct repairs and cleaning. Access to the 17-foot deep, eight-foot by eight-foot chamber was through a manhole with a fixed vertical ladder.

After conducting the repairs, the worker used Methyl Ethyl Ketone (MEK) to clean the chamber. It’s a product that is extremely volatile and flammable.

A short time later, the worker was going to re-enter the chamber with a propane torch to speed up the drying process before applying the spray waterproofing. The waterstop supervisor indicated to the worker not to use the torch, before being distracted by their phone. At the same time the worker lit the torch near the manhole entrance. MEK fumes being purged from the chamber ignited, causing an explosion that critically injured the worker.

There was no fire extinguisher at the scene. The worker died from their injuries several days later.

Ventrone was in his truck at the site but not present at the incident scene. It was determined in court that he failed, as a supervisor, to ensure that fire extinguishing equipment was provided and readily accessible at a project where open-flame operations were carried out, as required by section 52(2)(c) of Ontario Regulation 213/91 and contrary to section 27(1)(a) of the Occupational Health and Safety Act.

The court also imposed a 25 per cent victim fine surcharge as required by the Provincial Offences Act.

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