Excavation Safety EXAMINATION SET 2026
SOLVED QUESTIONS GRADED A+
● Who must stand away from vehicles being loaded or unloaded?
Answer: Employees — 29 CFR 1926.651(e). Employees must stay clear
to avoid being struck by falling or spilled materials during loading
operations.
● Atmospheric testing is required before entering excavations deeper
than how many feet? Answer: 4 feet — 29 CFR 1926.651(g)(1)(i).
OSHA requires testing for oxygen deficiency or hazardous atmospheres
in excavations over 4 feet deep.
● Precautions for atmospheres below 19.5% oxygen include respiratory
protection or what? Answer: Ventilation — 29 CFR 1926.651(g)(2).
Ventilation removes hazardous atmospheres and increases oxygen levels
to safe concentrations.
● Emergency rescue equipment must be available when hazardous what
conditions exist? Answer: Atmospheric conditions — 29 CFR
1926.651(g)(2). Breathing apparatus must be readily available when
hazardous atmospheres are present or expected.
● Employees are prohibited from working in excavations with
accumulated what? Answer: Water — 29 CFR 1926.651(h)(1). Standing
SOLVED QUESTIONS GRADED A+
● Who must stand away from vehicles being loaded or unloaded?
Answer: Employees — 29 CFR 1926.651(e). Employees must stay clear
to avoid being struck by falling or spilled materials during loading
operations.
● Atmospheric testing is required before entering excavations deeper
than how many feet? Answer: 4 feet — 29 CFR 1926.651(g)(1)(i).
OSHA requires testing for oxygen deficiency or hazardous atmospheres
in excavations over 4 feet deep.
● Precautions for atmospheres below 19.5% oxygen include respiratory
protection or what? Answer: Ventilation — 29 CFR 1926.651(g)(2).
Ventilation removes hazardous atmospheres and increases oxygen levels
to safe concentrations.
● Emergency rescue equipment must be available when hazardous what
conditions exist? Answer: Atmospheric conditions — 29 CFR
1926.651(g)(2). Breathing apparatus must be readily available when
hazardous atmospheres are present or expected.
● Employees are prohibited from working in excavations with
accumulated what? Answer: Water — 29 CFR 1926.651(h)(1). Standing
