Which statement correctly describes when secondary containment is required?

• A. It is required for glove bags of any size.
• B. It is never required.
• C. It is required only for glove bags larger than 5 sf and 5 lf.
• D. It is required for glove-bags over 3 square feet or 3 linear feet.

Answer: (D)

Secondary containment protects workers and the environment by catching contents if a glove bag leaks or ruptures during sampling. The rule uses a size threshold: if glove-bags are over 3 square feet or 3 linear feet, secondary containment is required. This threshold makes sense because small bags pose a lower spill risk, while larger bags have more potential contents to spill and thus need a catch container or tray. The option that would require containment for all glove bags is overly burdensome, and saying containment is never required is incorrect. A higher threshold, like 5 square feet and 5 linear feet, would miss intermediate-sized bags that still warrant containment, so the 3 square feet / 3 linear feet standard is the correct rule.