When alarm is sounded, go inside the building into classroom or other safe area.
- Take class roster to safe area and account for all students.
- Close all doors and windows.
- Turn off ventilation system.
- Seal cracks on all outside doors with duct tape or wet paper.
- Turn on television or radio for more information.
- Wait for all clear before going outside.
- Open shelter and turn ventilation system back on to remove any contaminated air that may be in the shelter.