Before the outriggers go down
Every boom delivery works to a site-specific job hazard analysis, written for that job and signed by the crew before the lift. It is not a filed policy that nobody reads. It names the steps in order, the hazards at each step, and the control for each hazard, in the order OSHA asks for them — eliminate, substitute, engineer, administer, then PPE last, because PPE is the last line and not the plan.
A competent person inspects the site and coordinates access with the GC. Barricades go up around the truck, the boom swing, and the fall zone. Overhead electrical and structural obstructions get identified and guarded. The receiving surface, its floor capacity, and its fall protection get verified before anything is lifted to it. Route, weather, signals, and the emergency plan are confirmed with the crew. If a hazard is identified, work pauses until it is corrected or controlled.