Excavator Operator Certification Exam Prep · Question
A trench is being excavated in soil determined to be Type 3. According to Ontario's O. Reg. 213/91, what is the maximum allowable slope ratio for the sides of the trench if sloping is used instead of shoring?
Ontario's O. Reg. 213/91, Section 233(3) specifies that for Type 3 soil, the maximum allowable slope for an excavation or trench is 1 horizontal to 1 vertical,
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Question: A trench is being excavated in soil determined to be Type 3. According to Ontario's O. Reg. 213/91, what is the maximum allowable slope ratio for the sides of the trench if sloping is used instead of shoring?
Answer options:
- 1 horizontal to 1 vertical (1H:1V) ✅ 1.5 horizontal to 1 vertical (1.5H:1V)
- 2 horizontal to 1 vertical (2H:1V)
- 0.75 horizontal to 1 vertical (0.75H:1V)
Correct answer: 1.5 horizontal to 1 vertical (1.5H:1V)
Explanation: Ontario's O. Reg. 213/91, Section 233(3) specifies that for Type 3 soil, the maximum allowable slope for an excavation or trench is 1 horizontal to 1 vertical, up to 1.5 horizontal to 1 vertical depending on factors but commonly 1.5H:1V is the steepest permissible without specific engineering for less than 1.5H:1V.
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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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