Washington State Underground Storage Tank (UST) Site Assessment Certification Practice Test

A confined space is defined primarily as a space that is large enough for a person to enter and perform work, but has limited means for entry or exit and is not designed for continuous occupancy. The definition emphasizes characteristics such as depth and the potential hazards present.

In the context of the provided choices, a confined space typically includes characteristics that could create risks for workers, such as insufficient ventilation and the potential for hazardous atmospheres. A space that is 4 feet or more in depth often raises concerns about the risk of engulfment and other safety hazards, which are important considerations in occupational safety standards.

This definition aligns well with regulations that establish appropriate safety measures for working in such environments. It’s important to recognize that the emphasis on depth implies a space contrary to the idea of general workspaces found inside buildings or open outdoor settings, which do not inherently possess the same risks associated with confined spaces.