Emergency Preparedness and Response
Core concepts
Emergency preparedness is all-hazards: the same plan, roles, and resources flex across fire, chemical release, severe weather, and security events. Start with a hazard vulnerability analysis (HVA) to rank probability and consequence, then build an emergency action plan with alarm, evacuation, shelter-in-place, accountability, and communication elements.
Response uses the Incident Command System (ICS) under NIMS: one incident commander, span of control, and common terminology. Exercises follow a progression - discussion-based (tabletop) to operations-based (drills, functional, full-scale) - and should be designed, evaluated, and improved using HSEEP-style after-action review.
Know the acute exposure benchmarks: IDLH is the concentration from which a worker can escape within 30 minutes without irreversible health effects - it is not a working limit. ERPGs and AEGLs describe population exposure for 1 hour (ERPG) or 10 min–8 hr (AEGL) at increasing severity tiers, and are used for community protective actions. PPE levels A–D reflect respiratory and skin protection: Level A is fully encapsulating SCBA; Level D is ordinary work clothing with no respiratory protection.
Traps
- Using an APF-equipped respirator in an IDLH atmosphere instead of SCBA.
- Confusing ERPG-2 (protective-action threshold) with IDLH (escape-only).
- Writing a plan that is never drilled.
- Ignoring off-site community impacts and notification obligations.
- Selecting Level B when the agent is a skin-absorbing vapor requiring Level A.
Worked example
A tank release models 60 ppm at the fence line; the substance's ERPG-2 is 30 ppm and ERPG-3 is 100 ppm. Shelter-in-place or evacuation is warranted for the downwind sector, while responders in the hot zone use SCBA until readings fall well below the action level.
Rule of thumb
If you must remember one sentence: plan, train, exercise, critique, revise - an undrilled plan is a document, not a capability.