Excavator Operator Certification Exam Prep · Question
A large-diameter storm sewer is being installed, requiring trench boxes for shoring. The trench is 4 metres deep. What is a specific confined space hazard associated with entering this type of trench, even with shoring in place, that an excavator operator should be aware of if workers are present?
Deep trenches, especially those near existing sewer systems or in contaminated ground, can accumulate dangerous gases (e.g., methane, hydrogen sulfide) which ar
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Question: A large-diameter storm sewer is being installed, requiring trench boxes for shoring. The trench is 4 metres deep. What is a specific confined space hazard associated with entering this type of trench, even with shoring in place, that an excavator operator should be aware of if workers are present?
Answer options:
- The risk of trench box collapse due to vibrations. ✅ Accumulation of toxic or flammable gases from nearby sewers.
- Excessive noise from the excavator impacting communication.
- Lack of adequate lighting inside the trench box.
Correct answer: Accumulation of toxic or flammable gases from nearby sewers.
Explanation: Deep trenches, especially those near existing sewer systems or in contaminated ground, can accumulate dangerous gases (e.g., methane, hydrogen sulfide) which are a primary confined space hazard that can cause incapacitation or death. Atmospheric testing is essential.
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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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