Excavator Operator Certification Exam Prep · Question
An excavation project requires workers to enter a trench that is 2.5 metres deep and expected to accumulate water due to groundwater seepage. What is the most important immediate safety control measure that must be in place before permitting entry?
Water accumulation in an excavation, especially at 2.5m deep, can destabilize walls and obscure hazards. A continuous dewatering system is essential to prevent
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Question: An excavation project requires workers to enter a trench that is 2.5 metres deep and expected to accumulate water due to groundwater seepage. What is the most important immediate safety control measure that must be in place before permitting entry?
Answer options:
- Ensuring workers wear waterproof boots.
- Providing a ladder for access and egress. ✅ Implementing a continuous dewatering system.
- Installing a temporary berm around the trench opening.
Correct answer: Implementing a continuous dewatering system.
Explanation: Water accumulation in an excavation, especially at 2.5m deep, can destabilize walls and obscure hazards. A continuous dewatering system is essential to prevent water accumulation, maintain stability, and ensure worker safety, as per O. Reg. 213/91 Section 234.
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Question explanations
- During a final inspection of an excavator, prior to beginning work, an operator notices significant play in th
- An excavator operator is preparing to dig a trench in cohesive soil. To achieve maximum breakout force, what a
- Which control typically governs the arm (or dipper arm) movement for an excavator?
- What condition might require sloping or shoring of a trench less than 1.2 meters (4 feet) deep?
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