Construction Health and Safety Technician (CHST) Practice Test

When hazardous substances are suspected during demolition, what must occur before starting the demolition?

1. Immediate evacuation

2. Testing and purging

3. Notification of authorities

4. Removal of non-hazardous materials

The correct answer is: Testing and purging

Before starting demolition in an area where hazardous substances are suspected, testing and purging are essential steps. This process involves conducting thorough assessments to identify the presence and concentration of any hazardous materials, such as asbestos, lead, or chemicals, that may pose a risk to workers and the environment. The testing phase typically includes sampling and analysis by trained professionals to ensure that any potential hazards are accurately identified. After identifying any hazardous substances, purging refers to the safe disposal or remediation of those materials. This is crucial for ensuring that workers are not exposed to dangerous conditions during the demolition process. The importance of this step cannot be overstated, as it helps to minimize health risks and ensures compliance with safety regulations. By prioritizing testing and purging, employers can provide a safer work environment and adhere to legal and ethical responsibilities concerning hazardous materials management.