OSHA PELs, NIOSH RELs, IDLH values, and the meaning of TWA, STEL, ceiling ('C') limits, and the Skin notation; how exposure limits are derived, computed (mixtures, extended shifts), and applied through the hierarchy of controls. Emphasis on interpreting and applying limits and notations — not memorizing specific values from Tables Z-1/Z-2/Z-3.
An employer is establishing "regulated areas" in a facility where benzene is used. In addition to areas where the 8-hour TWA exceeds 1 ppm, which short-term criterion also triggers the requirement for a regulated area?