What refers to the soil removed from an excavation?

The answer

The soil dug out of a trench or excavation is called spoil, and the heap it forms on the surface is the spoil pile. It is a basic vocabulary term on OSHA excavation and trenching exams, but it also carries a hard safety rule that examiners love to test alongside it.

Under OSHA's excavation standard (29 CFR 1926.651), temporary spoil must be kept at least 2 feet (0.61 m) from the edge of the excavation. The measurement is taken from the nearest base of the spoil pile to the edge of the cut. Keeping that clear zone does two things: it stops loose material from rolling or sliding back onto workers below, and it keeps the surcharge weight of the pile from loading the trench wall and triggering a collapse (cave-in).

Why the setback and the terms matter

Temporary spoil is material you intend to return to the excavation (backfill) when the work is done, so it sits nearby but must respect the 2-foot rule and often needs retaining or a barrier if space is tight. Permanent spoil is material hauled away and stored elsewhere because it will not go back in; because of its distance it is not the immediate cave-in hazard that temporary spoil is.

Spoil is one of several loads that can overload a trench lip. OSHA groups spoil with other surcharge loads — equipment, vehicles, and stockpiled materials — all of which must be set back from the edge. Excavations 5 feet deep or more generally require a protective system (sloping, benching, shoring, or a trench box), and a competent person must inspect the excavation and adjacent areas, including the spoil, daily and after any hazard-increasing event such as rain.

The bigger picture

Don't confuse related words. Backfill is the act of returning spoil to the hole; tailings and overburden are mining terms (overburden is the waste rock/soil above an ore body). On an OSHA trenching test, "soil removed from an excavation" is specifically spoil.

Practical takeaways a bare definition page usually skips:

• Measure the 2 feet from the base of the pile, not the peak.
• If the site is too cramped for a 2-foot offset, use a retaining device or move the spoil away entirely.
• Never let spoil, tools, or equipment sit on the unprotected edge above workers.
• The competent person, not the crew, decides whether the protective system and spoil placement are adequate.

Getting both halves — the word spoil and the 2-foot rule — is what earns full marks on this question.