MIAMI (AP) — Five contracting companies have been penalized more than $38,000 combined for a series of errors and oversights that led to last October’s collapse of a college parking garage that killed four workers, federal safety regulators announced Wednesday.

The Occupational Safety and Health Administration found evidence of missing welds and grout in some support columns, failure to properly brace columns and failure to inspect 18 columns as required. OSHA also said contractors didn’t follow project drawings and instructions.