MEOC Case Analysis & Practical Application 2 — Questions and Answers
Question 1: You are excavating near an underground utility line marked 18 inches from your planned cut. The standard safe excavation distance from a marked utility is:
- 6 inches
- 18 inches
- 24 inches (Correct answer)
- 36 inches
Correct answer: 24 inches
OSHA and most utility protection laws require maintaining at least 24 inches (2 feet) of clearance when excavating near marked utilities.
Question 2: During a grading job, you notice the spoil pile is too close to the excavation edge and soil is starting to slip. Your FIRST action should be:
- Continue working and monitor the pile
- Stop work and relocate the spoil pile (Correct answer)
- Add water to stabilize the soil
- Increase excavation speed to finish faster
Correct answer: Stop work and relocate the spoil pile
A spoil pile too close to the excavation edge creates a surcharge load that can cause cave-ins, so work must stop and the pile relocated before continuing.
Question 3: You arrive at a residential site and find a gas line marked 3 feet from your dig area. What should you do before breaking ground?
- Begin digging carefully on the opposite side
- Call 811 to confirm the mark is current and accurate (Correct answer)
- Assume the marking is correct and proceed with extra caution
- Dig a test trench parallel to the marked line
Correct answer: Call 811 to confirm the mark is current and accurate
Always call 811 (or the local one-call center) to verify that all utility locates are current before beginning any excavation, even if markings are visible.
Question 4: While operating a mini excavator on a hillside, the machine starts to feel unstable during a swing. The safest corrective action is:
- Swing faster to reduce the time the load is off-center
- Lower the boom and bucket to reduce the center of gravity (Correct answer)
- Extend the arm fully to counterbalance the load
- Increase engine RPM to gain more hydraulic power
Correct answer: Lower the boom and bucket to reduce the center of gravity
Lowering the boom and bucket reduces the machine's center of gravity and improves stability when operating on slopes.
Question 5: You are asked to lift a concrete barrier with the excavator bucket. The load is within the machine's rated lifting capacity. What is the key consideration before lifting?
- Whether the engine temperature is at normal operating level
- Whether the attachment is rated and rigged for lifting operations (Correct answer)
- Whether the fuel level is above half
- Whether the tracks are parallel to the load
Correct answer: Whether the attachment is rated and rigged for lifting operations
Using an excavator for lifting requires a properly rated lifting attachment and rigging; the bucket alone is not designed or certified for suspended load lifting.
Question 6: A co-worker signals you to stop but you cannot see what the hazard is. You should:
- Slow down and continue until you can identify the hazard
- Stop immediately and wait for clarification (Correct answer)
- Sound the horn and continue at reduced speed
- Ask over radio before stopping
Correct answer: Stop immediately and wait for clarification
A stop signal from any spotter or ground worker must be obeyed immediately; never continue operating until you understand and the hazard is cleared.
Question 7: After completing a trenching job, water begins accumulating in the open trench. Before workers enter for pipe installation, you must:
- Allow the water to drain naturally overnight
- Pump out the water and ensure the trench walls are still stable (Correct answer)
- Place wooden boards over the water for workers to walk on
- Instruct workers to wear waterproof boots and enter carefully
Correct answer: Pump out the water and ensure the trench walls are still stable
Water in a trench destabilizes soil walls and creates drowning risk; the water must be removed and trench integrity reassessed before any worker entry.
MEOC Case Analysis & Practical Application 2
You are excavating near an underground utility line marked 18 inches from your planned cut.
The standard safe excavation distance from a marked utility is: