Which of the following best defines a "lift" in excavation?

The definition of a "lift" in excavation refers to a layer of soil or dirt on top of another layer. This concept is crucial in excavation and grading work because lifts are often created during the process of grading, backfilling, or compacting soil. Each lift must be carefully managed to ensure proper compaction and stability in the project. Engineers and contractors typically specify the thickness of each lift to maintain structural integrity and avoid issues such as settlement or instability in the completed work.

In excavation, understanding lifts is essential when it comes to ensuring that each layer is adequately compacted before the next layer is added. This process is vital for achieving the right density and strength in the foundation or surface being prepared. Therefore, recognizing that a lift is essentially a layer helps clarify its role in the overall excavation and grading processes.