BMP - Tree Risk Assessment - 17

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Mallet. The trunk
may be sounded with
a non-damaging instrument such as a
broad-headed mallet
made of wood, rubber, leather, or resin.
The tree risk assessor strikes the tree
trunk in multiple
places and listens
for tone variations
that may indicate
hollows, sapwood
decay, or dead bark
(Figure 1).
Probe. A probe is a
stiff, small-diameter
rod, stick, or wire Figure 1. Sounding.The tree risk assessor can strike
tree with a mallet and listen for tonal variations
that is inserted into the
that indicate dead bark or internal hollows.
a cavity to estimate
its size and extent
(Figure 2). Because there may be sections of nonfunctional wood
adjacent to a cavity, this type of measurement should be considered
only an approximation of the extent of decay.
Digging tools. A trowel, shovel, or other hand tool can be used to
conduct minor excavations to expose surface roots or the root collar. Care should be taken not to damage roots during the excavation
process. More extensive root collar excavations are considered an
advanced assessment.

The primary limitation of a basic assessment is that it includes only
conditions that are detected from a ground-based inspection on the
day of the assessment. Internal, belowground, or upper-crown conditions, as well as certain types of decay, may be impossible to see
or difficult to assess and may remain undetected.

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BMP - Tree Risk Assessment

Table of Contents for the Digital Edition of BMP - Tree Risk Assessment

Table of Contents
BMP - Tree Risk Assessment - Cover1
BMP - Tree Risk Assessment - Cover2
BMP - Tree Risk Assessment - i
BMP - Tree Risk Assessment - ii
BMP - Tree Risk Assessment - Table of Contents
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