MEOC Research Methods & Evidence-Based Practice 2 — Questions and Answers
Question 1: When interpreting a geotechnical soil report before excavating, which soil classification indicates the highest risk of trench wall collapse?
- Type A — cohesive, undisturbed soil
- Type B — fissured or previously disturbed soil
- Type C — granular or submerged soil (Correct answer)
- Type D — compacted gravel with low moisture
Correct answer: Type C — granular or submerged soil
Type C soil is the least stable classification and requires the most protective measures due to its granular, saturated, or otherwise unstable nature.
Question 2: An operator reviews incident reports from the past three years showing repeated rollovers on slopes steeper than 25°. What evidence-based action should follow?
- Increase operator speed on slopes to reduce exposure time
- Add a standing order prohibiting excavation on slopes exceeding 25° (Correct answer)
- Replace all excavators with larger models
- Ignore the data because incidents were at other job sites
Correct answer: Add a standing order prohibiting excavation on slopes exceeding 25°
Evidence from incident trends should directly inform operational policy changes, such as slope angle restrictions, to prevent recurrence.
Question 3: Which document is the most authoritative primary source for a mini excavator's rated operating capacity?
- A coworker's verbal estimate from experience
- The OEM operator's manual and load chart (Correct answer)
- An online forum discussing similar machine models
- An older model's specifications from the same brand
Correct answer: The OEM operator's manual and load chart
The OEM (Original Equipment Manufacturer) operator's manual contains the authoritative, model-specific rated operating capacities.
Question 4: A site supervisor wants to compare ground bearing pressure limits to the excavator's machine weight. Which reference document provides the ground bearing pressure data for the equipment?
- Local newspaper construction column
- Excavator OEM specifications sheet (Correct answer)
- State motor vehicle registration
- Generic construction textbook chapter
Correct answer: Excavator OEM specifications sheet
OEM specification sheets list ground bearing pressure data for each machine model, enabling comparison with site soil capacity.
Question 5: During a post-incident review, an operator finds that the accident occurred because the swing radius was not communicated to ground workers. Which evidence-based corrective measure is most appropriate?
- Restrict all future excavation to single-operator job sites
- Implement a formal swing radius exclusion zone briefing for every job (Correct answer)
- Replace the excavator with a model with a smaller swing radius
- Require ground workers to stand farther away without explanation
Correct answer: Implement a formal swing radius exclusion zone briefing for every job
Evidence from incident analysis shows communication failures are preventable with structured pre-task briefings on swing exclusion zones.
Question 6: An operator consults utility locating records before digging. The records are three years old. What is the evidence-based best practice?
- Proceed because three years is recent enough
- Order a new utility locate since records may be outdated (Correct answer)
- Dig slowly and assume utilities haven't changed
- Only request new records if a prior incident occurred
Correct answer: Order a new utility locate since records may be outdated
Best practice and most state laws require a current utility locate before excavation because underground infrastructure changes over time.
Question 7: Which type of data is LEAST useful when developing evidence-based maintenance intervals for a mini excavator's hydraulic system?
- OEM-recommended service intervals from the manual
- Fluid analysis lab results from oil sampling
- Maintenance logs showing historical filter replacement dates
- An operator's guess based on machine appearance (Correct answer)
Correct answer: An operator's guess based on machine appearance
Anecdotal visual assessments are not evidence-based; maintenance intervals should rely on documented data, lab results, and OEM guidelines.
MEOC Research Methods & Evidence-Based Practice 2
When interpreting a geotechnical soil report before excavating, which soil classification indicates the highest risk of trench wall collapse?