MEOC Risk Assessment & Mitigation 3 — Questions and Answers
Question 1: A spotter signals the mini excavator operator to stop immediately. What should the operator do?
- Finish the current movement, then stop
- Stop all machine movement immediately (Correct answer)
- Ask the spotter to clarify before stopping
- Slow down and continue observing
Correct answer: Stop all machine movement immediately
A stop signal from a spotter must be obeyed instantly because the spotter can see hazards the operator cannot.
Question 2: When assessing the risk of working on a slope, which factor is MOST critical to evaluate first?
- The color of the soil
- The machine's rated slope operating angle from the manufacturer (Correct answer)
- The distance to the nearest water source
- Whether the bucket is filled or empty
Correct answer: The machine's rated slope operating angle from the manufacturer
Manufacturers specify the maximum safe operating angle for a machine; exceeding it dramatically increases rollover risk.
Question 3: Which hazard is MOST likely to be overlooked during a visual risk assessment before excavation?
- Overhead power lines
- Buried utilities not shown on records (Correct answer)
- Visible surface water
- Neighboring structures
Correct answer: Buried utilities not shown on records
Unmapped or incorrectly marked buried utilities pose a hidden risk that a visual inspection alone cannot detect.
Question 4: What does a 'near miss' report on a jobsite serve to accomplish in terms of risk management?
- It documents who was at fault so they can be penalized
- It identifies hazards before they result in actual injury or property damage (Correct answer)
- It is required only when damage exceeds $10,000
- It cancels work for the day until an investigation is complete
Correct answer: It identifies hazards before they result in actual injury or property damage
Near miss reports capture hazard data that allows corrective actions to be taken before a similar event causes injury.
Question 5: Silica dust generated during excavation work is regulated under OSHA standard 29 CFR 1926.1153. What is the PRIMARY health risk it presents?
- Skin rashes and eye irritation
- Irreversible lung disease including silicosis and lung cancer (Correct answer)
- Temporary hearing loss
- Digestive system complications
Correct answer: Irreversible lung disease including silicosis and lung cancer
Respirable crystalline silica causes silicosis, lung cancer, and COPD — all potentially fatal and irreversible conditions.
Question 6: When working adjacent to an open trench, how far from the edge should spoil piles be placed to minimize cave-in risk?
- Right at the edge for convenience
- At least 2 feet from the edge (Correct answer)
- At least 10 feet from the edge
- Spoil piles have no effect on trench stability
Correct answer: At least 2 feet from the edge
OSHA requires spoil piles to be placed at least 2 feet from the trench edge to reduce surcharge loading that can trigger a cave-in.
Question 7: An operator is asked to work inside a previously flooded excavation that has been pumped out. What additional hazard assessment is required?
- No additional assessment is needed once water is removed
- Atmospheric testing for oxygen deficiency and toxic gases (Correct answer)
- Only a visual check for standing water
- A survey to verify GPS coordinates
Correct answer: Atmospheric testing for oxygen deficiency and toxic gases
Flooding can introduce oxygen-depleted or toxic atmospheres into an excavation, requiring atmospheric testing before entry.
MEOC Risk Assessment & Mitigation 3
A spotter signals the mini excavator operator to stop immediately.
What should the operator do?