Excavator Operator Certification Exam Prep · Question
Before starting a new excavation for a pipe installation, the excavator operator is reviewing the soil classification report. It states 'clay, medium stiff, fissures evident'. How would this soil primarily be classified under provincial OHS regulations for excavation safety?
Fissured clay, even if medium stiff, loses some of its compressive strength and is generally classified as Type 2 soil (e.g., in Ontario Reg. 213/91, Type 2 inc
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Question: Before starting a new excavation for a pipe installation, the excavator operator is reviewing the soil classification report. It states 'clay, medium stiff, fissures evident'. How would this soil primarily be classified under provincial OHS regulations for excavation safety?
Answer options:
- Type 1 ✅ Type 2
- Type 3
- Type 4
Correct answer: Type 2
Explanation: Fissured clay, even if medium stiff, loses some of its compressive strength and is generally classified as Type 2 soil (e.g., in Ontario Reg. 213/91, Type 2 includes 'compacted or previously excavated' cohesive soils or 'uncompacted non-cohesive soils' if stable) rather than the highly stable, unfissured Type 1.
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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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