Survey team members who locate the contamination will place the markers at the _________.

The appropriate placement of markers at the point of detection is essential in CBRN reconnaissance operations. This ensures that the exact location of contamination is clearly identified for follow-up actions and safety protocols. By marking the specific point where contamination is detected, reconnaissance teams enable effective communication of hazards to other units and facilitate further assessment and decontamination processes.

Marking at the point of detection provides a precise reference that can be crucial for later monitoring or response activities, ensuring safety and operational efficiency. Other options, while relevant in different contexts, do not serve effectively for immediate communication of contamination sites. For instance, placing markers at the base camp would not provide timely information to teams approaching the hazardous area, and marking at the edge of the site could lead to ambiguity regarding the exact location of the contamination. Marking at a safe distance could protect personnel but does not provide a clear point for investigation or response. Thus, the focus on the point of detection is integral to the operational effectiveness and safety in CBRN reconnaissance.