Asbestos Contractor/Supervisor Practice Exam

What mastic removal method could potentially cause the highest worker asbestos exposure?

1. Bead blasting without HEPA filtration

2. Mechanical scraping

3. Water misting

4. Dry sanding

The correct answer is: Bead blasting without HEPA filtration

Bead blasting without HEPA filtration is likely to cause the highest worker asbestos exposure because this method involves the use of high-velocity particles to remove mastic, which can create a significant amount of airborne dust. Without effective HEPA filtration, the fine particles containing asbestos can easily become airborne, leading to increased inhalation risks for workers. The lack of proper filtration means that these hazardous particles are not effectively captured and contained, further exacerbating the potential exposure. In contrast, other methods like mechanical scraping or dry sanding can also generate dust, but they typically allow for more control over the work environment and can incorporate dust suppression techniques. Water misting, while also effective for controlling dust, reduces the likelihood of airborne inhalation, as the water binds to the particles. Therefore, bead blasting without effective filtration presents a particularly high risk due to its potential for creating uncontrolled and hazardous airborne asbestos levels.