Which of the following is a residential trigger level?

• A. 32 square feet
• B. 50 linear feet on pipes
• C. 55 gallon drum
• D. 10 cubic feet

Answer: (A)

Residential trigger levels are determined by the area that could be exposed in a living space, not by how big a container is or how long a pipe runs. That’s why the threshold is expressed in square feet. The 32 square feet option fits this area-based approach, reflecting the potential surface area of a residential space that could be affected.

The other measurements—50 linear feet on pipes (length), 55 gallon drum (container size), and 10 cubic feet (volume)—pertain to different contexts or non-residential scenarios where thresholds are based on length or volume. So for a residential setting, area in square feet is the relevant trigger, making 32 square feet the correct choice.