OSHA cited the company for similar violations in 2017 and 2018, and has placed the company in its Severe Violator Enforcement Program.

Agency says company subjected employees to hostile and segregated working environment as well as retaliation.

The measure would require employers to give workers paid breaks in cool spaces, access to water and training on how to respond to symptoms of heat illness.

The plumbers were using a gasoline-powered saw to cut through concrete when they were overcome by carbon monoxide gas emitted from the equipment, causing one of the workers to lose consciousness. 

"We've got this," the governor tells plumbers worried as their profession faces deregulation.