The president of a San Francisco construction company and two employees have been arrested in connection with the death of a worker crushed by a steamroller in 2016.

Michael Sommer, president of LC General Engineering & Construction Inc.; Manuel Silao, a construction project manager; and Ramiro Pena-Pena, a foreman, allegedly allowed an unqualified worker to operate a heavy steamroller that fatally crushed another employee on a work site at the intersection of Vicente Street and 18th Avenue in San Francisco in January 2016, officials said Wednesday.

The worker, who had never received training to operate a steamroller, got behind the wheel of the heavy machinery under his employer’s instruction, lost control of the roller and ran over another employee, Maurilio Rojas, according to the San Francisco district attorney’s office.

Pena-Pena, 48, of Dublin; Sommer, 41, of Pacifica; and Silao, 59, of Richmond, were arrested Tuesday and each charged with one felony count of involuntary manslaughter and three felony violations of the labor code, officials said.

“When businesses ignore regulations designed to create safe workplaces, they put their employees and the community at risk,” said District Attorney George Gascón. “The stakes are high, and the volume of construction under way in San Francisco requires these companies to take the precautions necessary to mitigate the risk of injury.”

LC General Engineering & Construction Inc. was cited for six health and safety violations, four of which were serious, in the fatal 2016 incident, according to records with the U.S. Department of Labor's Occupational Safety and Health Administration, the agency responsible for investigating workplace safety violations.

The company is facing a $52,810 fine. The case is under contest, according to the Cal/OSHA incident report.

Pena-Pena was arraigned Wednesday afternoon, officials said. Sommer is set to be arraigned on Thursday and Silao on Tuesday.

Their arrests followed an investigation by Cal/OSHA officials, assisted by Brian Arnold, a senior inspector with the San Francisco district attorney’s office.

Lauren Hernandez is a San Francisco Chronicle staff writer. Email: lauren.hernandez@sfchronicle.com Twitter: @LaurenPorFavor