Which necessary safety equipment should be available at UST sites?

The correct choice highlights essential safety equipment that should be present at underground storage tank (UST) sites to ensure a secure environment for workers and the public. Fire extinguishers are crucial for managing fire risks associated with flammable materials typically stored in USTs. Spill kits are necessary for addressing potential leaks or spills, allowing for immediate containment and cleanup to prevent environmental contamination. Emergency shut-off devices play a vital role in quickly halting operations in the event of an emergency, which can significantly mitigate risks of accidents.

While traffic cones, warning signs, personal protective equipment, and first aid kits are important components of a comprehensive safety plan, they do not encompass the specific necessities that directly address the unique hazards presented by UST sites and emergencies related to them. The presence of fire extinguishers, spill kits, and emergency shut-off devices specifically enhances the safety protocol tailored to potential incidents at UST facilities, making them indispensable in this context.