CES Risk Management & Quality Assurance 2 — Questions and Answers
Question 1: When performing a Job Hazard Analysis (JHA) for a blasting operation, which step should be completed FIRST?
- Select appropriate PPE for the crew
- Break the job into discrete sequential tasks (Correct answer)
- Identify the nearest emergency medical facility
- Review the blast design drawings
Correct answer: Break the job into discrete sequential tasks
A JHA begins by breaking the job into its component tasks before hazards associated with each task can be identified and controlled.
Question 2: Which qualitative risk assessment matrix axis combination correctly defines 'risk level'?
- Severity × Frequency
- Likelihood × Consequence (Correct answer)
- Exposure × Control effectiveness
- Probability × Detection difficulty
Correct answer: Likelihood × Consequence
Risk is universally defined in safety management as the product of Likelihood (probability of occurrence) and Consequence (severity of outcome).
Question 3: A blaster discovers that 15% of the detonators in a shipment have resistance values outside the manufacturer's specified tolerance. The correct QA response is to:
- Use the out-of-tolerance units only in non-critical positions
- Reject the entire lot and notify the supplier (Correct answer)
- Test each unit individually and use those that pass
- Average the readings; if the mean is within tolerance, proceed
Correct answer: Reject the entire lot and notify the supplier
A 15% defect rate far exceeds acceptable quality limits for initiating devices; the entire lot must be quarantined and the supplier notified per industry QA protocols.
Question 4: The hierarchy of controls, ranked from most to least effective for explosives operations, begins with:
- Administrative controls
- Substitution
- Engineering controls
- Elimination (Correct answer)
Correct answer: Elimination
Elimination of the hazard is always the most effective control; subsequent tiers include substitution, engineering controls, administrative controls, and PPE.
Question 5: Under ATF regulations, a licensed explosives dealer must conduct a physical inventory of all explosive materials at minimum:
- Weekly
- Monthly
- Annually (Correct answer)
- Every five years
Correct answer: Annually
27 CFR Part 555 requires licensed dealers to conduct a complete physical inventory of explosive materials at least annually.
Question 6: Which blasting risk scenario represents a 'high likelihood / low consequence' classification?
- Premature detonation of a loaded hole
- A misfire that results in a bootleg
- A truck tire puncture from fly-rock on a haul road (Correct answer)
- Nitrogen oxide fume cloud drifting off-site
Correct answer: A truck tire puncture from fly-rock on a haul road
Tire damage from fly-rock is a relatively frequent, low-severity event — property damage without injury — fitting the high-likelihood/low-consequence cell.
Question 7: Root cause analysis of a blasting incident revealed that the crew skipped the pre-blast area inspection because they were behind schedule. This failure is best categorized as a:
- Latent organizational failure (Correct answer)
- Active human error
- Equipment failure
- Environmental trigger
Correct answer: Latent organizational failure
Schedule pressure is a latent organizational condition (systemic weakness) that created the environment for the procedural shortcut, making it a latent organizational failure.
CES Risk Management & Quality Assurance 2
When performing a Job Hazard Analysis (JHA) for a blasting operation, which step should be completed FIRST?