Decontamination Corridor Setup for Chemical and Biological Agents

The corridor must have three separate zones: Hot Zone (contaminated area, outside the shelter), Warm Zone (active decontamination area with rinse facilities), and Cold Zone (clean entry to main shelter). Establish this layout before any contaminated individuals arrive. This zoning prevents tracked contamination into the clean shelter areas and allows safe transition from hazard to safety.

Do not allow people to move backward from warm to hot zone once decontamination begins—contamination must move out, not back into clean areas.

Create a one-way traffic pattern using physical barriers (tarps, plastic sheeting, tables, or rope) that guides individuals from hot zone → warm zone → cold zone without possibility of backtracking. Mark zones clearly with signs or markings. Position personnel at each transition point to prevent accidental re-entry into clean zones. Water flow should also be one-directional, with designated drainage paths away from clean water sources and shelter intake.

Cross-contamination occurs instantly when someone from the warm zone walks back through the hot zone—enforce one-way movement absolutely.

Assemble decontamination supplies in the warm zone: large water supply (plastic drums, rain barrels, or fire hoses connected to municipal water if available), soft brushes or sponges, disposable scrub cloths, dry towels (plastic-backed to shed water), plastic bags or containers for contaminated clothing, plastic sheeting to line the ground, and collection containers for contaminated runoff. Include shoe covers or designated contamination-removal trays at zone transitions. Store improvised protective equipment (gloves, aprons, respirators) for corridor personnel.

Contaminated water runoff must be contained and directed away from the shelter—never allow it to drain toward clean water sources or living areas.

Process individuals through the corridor in this order: (1) Remove outer clothing in the hot-zone transition and place in sealed containers; (2) Rinse entire body with copious water (15–60 seconds), paying special attention to hair, face, underarms, and between toes; (3) In the warm zone, remove secondary clothing (undergarments, socks) and place in containers; (4) Perform a final thorough rinse with fresh water; (5) Provide clean dry clothing or sheets from the cold zone supply. Do not move to the cold zone until final rinse is complete.

Incomplete rinsing leaves chemical residue that can cause continued harm—allocate sufficient water and time (2–3 minutes per person minimum) for thorough decontamination.

Assign trained personnel to operate the corridor in layers of improvised protection: gowns/aprons (plastic or rubberized cloth), gloves (double-gloved), eye protection (goggles), and respiratory protection (N95 or higher, or improvised mask if necessary). Rotate staff every 20–30 minutes to prevent fatigue and exposure accumulation. Provide hand-washing and dry clothing stations for personnel outside the decontamination zone. Document the names and times of all personnel working in the corridor to track their exposure.

Corridor operators are at secondary exposure risk—protect them with available PPE and enforce strict rotation to limit individual exposure duration.

Establish a contaminated-water collection system: channel runoff into plastic-lined trenches, drums, or pools away from all shelter water supplies and living areas. If possible, direct drainage to a low point outside the shelter perimeter where it cannot migrate back. Maintain a processing log at the cold-zone entry: record the date/time each person enters, their name (if known), physical condition, symptoms observed, and the decontamination officer who processed them. This log informs medical triage and helps track disease/contamination spread in the shelter.

Contaminated water infiltration into the shelter's water supply is a secondary disaster—plan drainage routes before decontamination begins and inspect regularly.