MEOC Risk Assessment & Mitigation 2 — Questions and Answers
Question 1: Before beginning excavation in an unfamiliar area, what is the FIRST step an operator should take to assess underground hazards?
- Call 811 to request utility locates (Correct answer)
- Begin digging slowly to feel for obstructions
- Ask nearby workers if they know of any utilities
- Review the site plan without calling anyone
Correct answer: Call 811 to request utility locates
Calling 811 triggers a legal locate request that brings utility companies to mark buried lines before any excavation begins.
Question 2: A mini excavator is working near an embankment when the operator notices the soil beginning to crack along the edge. What should the operator do?
- Continue working but more slowly
- Move the machine away from the edge immediately (Correct answer)
- Add more counterweight to the rear
- Dig faster to finish before a collapse occurs
Correct answer: Move the machine away from the edge immediately
Soil cracking near an embankment edge is a warning sign of imminent collapse, and the operator must immediately reposition the machine to safe ground.
Question 3: Which condition makes a work zone significantly more hazardous when operating a mini excavator?
- Clear sunny weather with no wind
- Recently saturated soil after heavy rain (Correct answer)
- Firm compacted gravel surface
- Low ambient noise environment
Correct answer: Recently saturated soil after heavy rain
Saturated soil loses shear strength, increasing risks of collapse, machine sinkage, and ground instability around the excavation.
Question 4: When conducting a pre-task risk assessment, which tool helps identify ALL stakeholders who could be affected by the excavation work?
- Job Hazard Analysis (JHA) (Correct answer)
- Equipment inspection checklist
- Manufacturer's service manual
- Load chart reference card
Correct answer: Job Hazard Analysis (JHA)
A Job Hazard Analysis systematically identifies tasks, associated hazards, and all persons who may be exposed, including bystanders.
Question 5: An operator notices a marked gas line is only 18 inches below the planned excavation depth. What is the correct action?
- Proceed carefully using the bucket's teeth as sensors
- Stop and hand dig within 18–24 inches of the marked line (Correct answer)
- Ignore the mark if it appears faded
- Excavate quickly past the line to get it behind you
Correct answer: Stop and hand dig within 18–24 inches of the marked line
Within the tolerance zone near marked utilities, hand digging is required to prevent striking and rupturing the gas line.
Question 6: Which personal protective equipment (PPE) is always required for a mini excavator operator working on an active construction site?
- Hard hat, high-visibility vest, and steel-toed boots (Correct answer)
- Rubber gloves and face shield only
- Earplugs and sunglasses only
- No PPE is required inside the cab
Correct answer: Hard hat, high-visibility vest, and steel-toed boots
OSHA requires hard hats, high-visibility vests, and steel-toed boots as standard PPE on active construction sites.
Question 7: What is the primary purpose of establishing an exclusion zone around an operating mini excavator?
- To reserve parking space for the equipment
- To prevent unauthorized personnel from entering the swing radius (Correct answer)
- To mark where spoil piles should be placed
- To designate the refueling area
Correct answer: To prevent unauthorized personnel from entering the swing radius
An exclusion zone prevents workers and bystanders from being struck by the rotating superstructure or swinging bucket.
MEOC Risk Assessment & Mitigation 2
Before beginning excavation in an unfamiliar area, what is the FIRST step an operator should take to assess underground hazards?