BMP - Tree Risk Assessment - 52

Appendix 1
Tree-Related Conflicts That Can Be a Source of Risk
Conflicts result when trees interfere with people, property, or activities. Conflicts can result in personal injury, death, property damage, or disruption of
activities. Common tree-related conflicts are described.
* Allergies. Some trees produce materials that can cause allergic reactions in people. These materials include flowers, pollen, sap, fruit,
nuts, scents, or trichomes (hairs) from leaves.
* Electric utilities. Trees growing next to or under high-voltage electric
facilities have been known to cause power outages when contact is
made. Touching a tree that is energized represents an indirect contact
with the power lines, and in some cases, may result in injury. Similarly, large trees may grow close enough to power lines that anyone
climbing the tree could come into direct contact with them.
* Fire. Tree leaves, bark, and wood are flammable under certain conditions. In dry climates, consideration must be given to the size, species, and location of trees
that are growing close
to structures and electrical utilities. Tree failures
impacting electric lines
can create an elevated risk
of wildfire. In nearly all
climates, certain mulches,
such as pine needles, are
flammable.
* Fruit. Trees with female flowers produce
seeds, but only a few
species produce nuisance
fruit and cones. Fruit can
produce a slippery or unstable walking surface
that may result in pedesFigure A1-1. Conflicts result when trees interfere
trian falls. Large cones
with people, property, or activities and may result
in harm. In this case, conflicts include attraction of
from some pines, and fruit
stinging insects, falling and fallen fruit, pavement
from some palms, fruit
lifting, interfering with street lighting, and blocking
visibility of the stop sign.

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BMP - Tree Risk Assessment

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