80.3.1.1 Specifications for root management should
include, but are not limited to: objectives, treatment
area, scope of work, methods, and timing.
Q
The objective calls for retaining a stable tree
with as large a leaf canopy as possible and
an adequate root volume to support normal
growth.
Q
The roots will be exposed before deciding
which roots to cut (even with non-selective root
pruning, we need an idea of what roots we are
impacting).
Q
The root cutting is done in the least injurious
manner to the trees.
Q
The roots are not to be excavated/removed until
they are cleanly cut to avoid further damage on
the tree side of the point of the root cutting (this
can eliminate tearing of roots back towards the
tree).
Q
84.5.1 When non-selective root cutting is necessary,
roots shall be cut as far from the trunk as practical.
The closest distance non-selective root pruning
will be performed is deemed sufficient for the
tree size, trunk orientation/lean, species, root
system, and site conditions. (There isn't a set
distance; the BMP lists the minimum as "3 to 6
times the trunk diameter.")
These statements can be translated in the writing of
specifications so that:
The ANSI A300 Part 8 - Root Management standard is now
available from SMA, ISA Chapters, ISA, and TCIA.
83.1.4 Root management objectives shall be defined
based on potential tree benefits, the intended use of
the site, tree stability, and the scope of the assignment.
80.3.2 Practices that avoid damage to roots shall be
preferred (See Annex A).
83.3.4 Inspection should include, but is not limited
to, one or more of the following: conditions in the
crown that may reflect root conditions ...
83.3.5 Mulch, soil, and other materials should be
removed as needed to allow for the inspection.
84.4.2 Girdling roots should be exposed before pruning cuts are planned or made.
84.4.3 Retention of encircling or girdling roots that
are providing more benefit than damage shall be
considered.
30
City Trees
