Index & Summary https://wp.conspira.org/baltimore-key-bridge
“If there was a skiff there, it would have heard the mayday call and radioed the workers to get off the bridge,” O’Bryan said. “There needs to be an investigation into whether the skiff was there and, if not, why it wasn’t.”
https://duckduckgo.com/?q=osha+bridge+work+requires+skiff
See also
https://www.osha.gov/laws-regs/standardinterpretations/2004-02-09-0
http://www.ecfr.gov/current/title-29/subtitle-B/chapter-XVII/part-1926/subpart-E/section-1926.106