For schools, the AHERA threshold for a Project Designer requirement is:

• A. greater than 0.5 sf
• B. greater than 1 sf
• C. greater than 3 sf or 3 lf on pipes
• D. greater than 5 sf

Answer: (C)

In this area, what's being tested is the specific size threshold that triggers requiring a Project Designer for asbestos-related work in schools. The official rule is that a Project Designer is needed when disturbing asbestos-containing material would affect more than a small amount—specifically, more than 3 square feet of asbestos-containing material, or more than 3 linear feet of pipe insulation containing asbestos. This distinction matters because it sets the level of professional planning and oversight required for abatement projects: small, incidental disturbances can be managed with simpler procedures, while larger disturbances must be designed and supervised by a trained Project Designer to ensure health and regulatory compliance. So the correct threshold is more than 3 square feet or more than 3 linear feet on pipes. The other options don’t match that standard: they propose smaller thresholds or, in the case of a higher square footage like 5 sf, miss the exact minimum trigger and the pipe measurement component.