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3. Levels and Scope of Tree Risk Assessment
Tree risk assessments can be conducted at different levels of detail and may
employ various methods and tools. The level selected should be specified in
the scope of work established between the risk assessor and the client prior
to conducting an assessment. The level(s) should be appropriate for the
assignment. Three levels of tree risk assessment are defined and described
within this text:
* Level 1: Limited visual assessment
* Level 2: Basic assessment
* Level 3: Advanced assessment
If conditions cannot be adequately assessed at the specified level, the assessor
may recommend a higher level or different assessment. However, the assessor
is not obligated to provide the higher level if it is not within the scope of the
original assignment, without additional compensation, or without modifications to the agreement or contract.
In addition to specifying the level of inspection, tree risk assessors
also should describe pertinent details regarding the method. For example,
a Level 1 assessment can be done by walking by, driving past, or flying
above the trees. The method used will greatly influence the cost and reliability of the results.
At any level of assessment, if a situation is encountered where tree
failure is imminent and a high-value target is present and likely to be struck
by the failure, the situation should be reported to the client as soon as possible. In addition, immediate action may be required to restrict access to
the target zone.
Level 1: Limited Visual Assessment
Level 1 risk assessment is a visual assessment from a specified perspective of an individual tree or a population of trees near specified targets. It
is conducted to identify obvious defects or specified conditions. Typically,
one or two of the three factors assessed during a Level 1 tree risk assessment (likelihood of failure, likelihood of impact, consequences) is/are held
constant. For example, if assessing street trees, the likelihood of impact and
the consequences of failure might be assumed to be the same for each tree
on a block, and therefore the assessor would only need to determine each
tree's likelihood of failure.
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BMP - Tree Risk Assessment
Table of Contents for the Digital Edition of BMP - Tree Risk Assessment
Table of Contents
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