Which procedure helps prevent contamination during critical barrier setup?

The answer is correct because the procedure of following the correct setup sequence and placing scaffolding first is vital in preventing contamination during the critical barrier setup. When setting up barriers in areas where asbestos may be present, it is crucial to maintain a clean environment. By organizing the setup in a logical order, starting with scaffolding, workers minimize the risk of disrupting the containment area, which could allow asbestos fibers to escape into the surrounding environment.

Establishing scaffolding first helps create a stable structure around which barriers can be effectively installed. This sequence ensures that workers do not have to move through already set barriers, which could inadvertently disturb them and lead to contamination. It also helps in ensuring that all necessary safety measures are implemented right from the beginning, making the entire process more systematic and efficient, thus reducing the likelihood of accidental exposure.

Other approaches, while they may have their merits in different contexts, do not specifically address the critical aspect of maintaining the integrity of the containment area during setup in the way that establishing the correct sequence does.