Under AHERA, when must a physical assessment of material be performed?

A physical assessment of materials must be performed for all known friable and assumed asbestos-containing materials (ACM) under the Asbestos Hazard Emergency Response Act (AHERA). This requirement ensures that schools and other covered entities properly evaluate the condition of materials that may release asbestos fibers into the air when disturbed or damaged.

By requiring assessments for both known friable materials, which are easily crumbled and can release fibers, and assumed ACM, which is materials that may contain asbestos but have not been tested, AHERA mandates a comprehensive approach to managing asbestos risks. This thorough evaluation is crucial for identifying materials that need to be monitored, abated, or encapsulated to protect public health.

In contrast, the other options do not encompass the full scope of the requirements under AHERA, as there are restrictions or conditions that limit when assessments should take place. This specificity in the regulation aims to ensure maximum safety and compliance in handling asbestos in various materials used in schools and similar facilities.