Excavator Operator Certification Exam Prep · Question
A trench with vertical walls is being dug in stable, dry Type 1 soil (hard, unfissured rock) to a depth of 3.5 metres. Which of the following is the most appropriate protective system for this scenario, assuming no other hazards?
According to Ontario Regulation 213/91, Section 234(1) Table, an excavation in Type 1 soil with vertical walls is exempt from shoring or sloping requirements up
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Question: A trench with vertical walls is being dug in stable, dry Type 1 soil (hard, unfissured rock) to a depth of 3.5 metres. Which of the following is the most appropriate protective system for this scenario, assuming no other hazards?
Answer options:
- Sloping the trench walls to a 1:1 ratio
- Installing a trench box designed for 3.5m depth
- Utilizing a benching system with benches at least 1.2m wide ✅ No protective system is strictly required by regulation for Type 1 soil depths up to 4.5m
Correct answer: No protective system is strictly required by regulation for Type 1 soil depths up to 4.5m
Explanation: According to Ontario Regulation 213/91, Section 234(1) Table, an excavation in Type 1 soil with vertical walls is exempt from shoring or sloping requirements up to a depth of 4.5 metres. This exception is due to the inherent stability of Type 1 soil.
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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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