Which form is used to determine contamination boundaries?

• A. Nearside-Farside
• B. Bounce and Bypass
• C. Contour Mapping
• D. Area Boundary Form

Answer: (A)

The form used to determine contamination boundaries relies on comparing measurements taken on the side near the source (nearside) with measurements on the opposite side (farside). By collecting data at paired locations across a potential boundary, you can see where contamination crosses the threshold and decide where the boundary should lie. If the near side shows contamination above the threshold while the far side does not, the boundary sits between those points. If contamination remains on the far side as well, you extend the boundary; if the near side is clean, there’s no boundary in that area. This approach provides quick, directional, and auditable decision-making in the field. Contour mapping would require more extensive sampling to create a map rather than a rapid boundary decision, bounce and bypass isn’t a standard method for establishing a boundary, and an Area Boundary Form is too generic and doesn’t emphasize the near-versus-far comparison that directly defines the boundary.