If multiple CBRN contamination sites exist in an area, how should the marking signs be placed?

• A. In a line with spacing 50m
• B. At random locations
• C. Adjacent to each other
• D. On a single marker

Answer: (C)

Clearly delineating the boundary of a contaminated area so responders can quickly gauge its extent is the main idea. When several CBRN contamination sites exist in one area, placing marking signs adjacent to one another creates a continuous outline of the affected zone. This minimizes gaps, prevents misinterpretation of where hazard ends, and supports efficient movement, assessment, and decontamination planning. Spacing signs in a line with gaps could leave unmarked areas that look safe, while placing signs at random locations would look inconsistent and confuse teams. Putting all markings on a single marker won’t convey how widespread the contamination is. Therefore, signs should be placed tightly together, forming a connected marking around the area.