Excavator Operator Certification Exam Prep · Question
What is 'Type 4' soil characterized by in excavation safety, according to Ontario's O. Reg. 213/91?
As per Ontario's O. Reg. 213/91 Section 228(1), Type 4 soil includes loose, sandy, or wet soil, or soil under water, and highly unstable soils that require the
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Question: What is 'Type 4' soil characterized by in excavation safety, according to Ontario's O. Reg. 213/91?
Answer options:
- Only solid, unweathered bedrock.
- Any soil that is exceptionally stable and cohesive. ✅ Liquid soil, or soil that is saturated and unstable, or soil that has a high potential for liquefaction.
- Soft, cohesive soil with a high clay content, but no visible cracks.
Correct answer: Liquid soil, or soil that is saturated and unstable, or soil that has a high potential for liquefaction.
Explanation: As per Ontario's O. Reg. 213/91 Section 228(1), Type 4 soil includes loose, sandy, or wet soil, or soil under water, and highly unstable soils that require the most stringent protective measures.
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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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