In subsoil excavation, the excavation and disposal of muck, clay, rock, or any other material that is unsuitable in what position?

• A. Its original position
• B. In its current position
• C. In a new position
• D. In front of the structure

Answer: (A)

The main idea is that materials unsuitable for supporting the planned subgrade—muck, clay, rock, and similar waste—must be removed from the excavation and disposed of so they do not become part of the backfill or the finished subgrade. Keeping this material in its original position (i.e., not using it as fill or placing it in the area where the structure will be built) helps preserve the intended bearing capacity and drainage of the subsoil. Moving or placing the unsuitable material in other positions would risk weakening the foundation area or contaminating the good soil, which is why disposing of it in its original position is the correct approach.