CTSP - Certified Treecare Safety Professional Hazard and Risk Assessment Questions and Answers — Questions and Answers
Question 1: Which of the following best defines the term 'risk' in the context of arboricultural hazard assessment?
- The potential for a tree or tree part to cause harm.
- The combination of the likelihood of a tree failure occurring and the severity of the potential consequences. (Correct answer)
- Any structural defect, decay, or condition that may lead to tree failure.
- A tree that has been identified for removal due to its condition.
Correct answer: The combination of the likelihood of a tree failure occurring and the severity of the potential consequences.
Risk is the calculation that combines the probability of an event (like a tree part failing) with the severity of the outcome (injury or property damage). A hazard is merely the potential source of harm, but risk quantifies the likelihood and consequence.
Question 2: A tree care crew is preparing to remove a large, dead oak tree located next to a busy sidewalk and a public park. According to ANSI Z133 standards, what is the first critical step in their job-site hazard assessment?
- Assembling and inspecting all chainsaws and rigging equipment.
- Beginning to limb the tree from the lowest branches upward.
- Conducting a pre-work briefing to discuss hazards, work procedures, and establish a work zone. (Correct answer)
- Applying for a permit from the local municipality for tree removal.
Correct answer: Conducting a pre-work briefing to discuss hazards, work procedures, and establish a work zone.
Before any work begins, ANSI Z133 standards mandate a job briefing. This meeting is essential for all crew members to understand the scope of work, identify all potential hazards (the tree's condition, targets like the sidewalk and park, etc.), and agree on the safety procedures and controls to be used.
Question 3: When performing a tree risk assessment, for a significant risk to exist, there must be a tree with a defect and what other critical component?
- A qualified arborist to perform the inspection.
- A target. (Correct answer)
- A history of previous failures from the same tree species.
- Advanced decay detection equipment.
Correct answer: A target.
For risk to exist, there must be a combination of a hazard (the defective tree or tree part) and a target (people, property, or activities that could be damaged or injured if the tree fails). Without a target, there is no risk, even if the tree has a high likelihood of failure.
Question 4: According to OSHA and ANSI Z133 standards, a comprehensive job-site hazard analysis for a tree pruning operation should include an assessment of which of the following categories?
- Only the structural integrity of the tree being pruned.
- The client's budget and the expected time for job completion.
- The health of the tree, site conditions, and necessary equipment and PPE. (Correct answer)
- The crew's previous experience with the tree species.
Correct answer: The health of the tree, site conditions, and necessary equipment and PPE.
A complete hazard assessment is multi-faceted. It must include an inspection of the tree itself for structural issues, an evaluation of the surrounding site for hazards like power lines or uneven ground, and a verification that all tools, equipment, and personal protective equipment (PPE) are appropriate and in safe working order.
Question 5: A CTSP is observing a crew setting up for a removal. The crew identifies a large, detached branch hung up in the canopy (a 'widow maker'). How should this specific hazard be classified?
- A latent hazard.
- A tolerable risk.
- An imminent danger hazard. (Correct answer)
- A site-specific variable.
Correct answer: An imminent danger hazard.
A 'widow maker,' or any large, detached limb caught in a tree, is considered an imminent danger hazard. It is unstable and could fall at any moment without warning, posing a direct and immediate threat to anyone below. This type of hazard must be addressed with extreme caution and prioritized before other work commences underneath it.
Question 6: What is the primary difference between a 'hazard' and a 'risk'?
- A hazard is related to equipment, while a risk is related to the tree's condition.
- A hazard is a condition with the potential to cause harm, while risk is the likelihood of that harm occurring combined with its severity. (Correct answer)
- A hazard can be eliminated, while a risk can only be mitigated.
- There is no functional difference; the terms are used interchangeably in safety management.
Correct answer: A hazard is a condition with the potential to cause harm, while risk is the likelihood of that harm occurring combined with its severity.
The distinction is crucial in safety management. A hazard is the source of potential harm (e.g., a cracked branch). Risk is the calculated probability that the hazard will cause an incident and how severe the consequences would be (e.g., the likelihood of the branch falling on a car and the resulting damage).
CTSP - Certified Treecare Safety Professional Hazard and Risk Assessment Questions and Answers
Which of the following best defines the term 'risk' in the context of arboricultural hazard assessment?