This elevation point is used to determine all other elevations on the construction site.

• A. Elevation line
• B. Datum point
• C. Reference point
• D. Bench mark

Answer: (D)

The main idea here is using a fixed point with a known height to determine all other heights on the site. A benchmark is a precisely measured point whose elevation is documented and used as the reference for leveling work. When surveyors set grades or transfer elevations, they measure from this benchmark so every other elevation on the site ties back to the same, accurate vertical reference. That fixed elevation lets you calculate the height of any point relative to sea level or a local datum, ensuring consistency across the entire project.

Thinking about the other terms helps: an elevation line describes a height on a plan or a profile but isn’t a physical point you can tie measurements to. A datum point is a general reference used for measurements, but the standard on construction sites is specifically a benchmark—a point with a known elevation established for leveling. A reference point is a broader term for any point used as a basis for measurements, but it may not have a documented elevation to anchor all other elevations.

So, the elevation point used to determine all other elevations on the construction site is a benchmark.