HomeMy WebLinkAboutARCH-0161-2019 FAA Arborist Report Transitional air space south
Fence Line
Arborist Assessment of Trees
Date: January 17, 2022
Site: FAA Transitional Air Space South
Tree Number/Species: 19,20,21,22,23,24,25,26,27 Eucalyptus globulus
Observed – Very tall Blue Gum Eucalyptus. Canopy is healthy, not particularly thick, and new growth is noted.
Most of the canopy is on the upper third of the trunk. Height-of-canopy-to-trunk ratio makes these trees
leveraged. Branches range from well-placed and well attached to some narrow angles and poor attachments.
Trunks/stems are mostly straight (except for 27). Trees have not been maintained. These trees are particularly
close to the current parking area except for 27 which has a distinct lean (in neighbor’s property).
Reason for removal – Trees are close to the air space needed for medivac helicopter flights. The FAA considers
this area as Transitional Surface: “Transitional Surface – An area not directly below a flight path that allows for
clearance on either side.” Tall trees such as these fall into the category as being a clearance issue. Without
removal of the trees, medivac flights at the hospital will not be permitted. Trimming these trees lower is not
possible as there are no branches to trim down to and still meet the FAA requirements (i.e., trees would be
stubbed).
All trees marked with T will be trimmed for height clearance allowance under FFA guidelines for height.
Chris Stier
ISA Certified Arborist WE9262-A
*Assessment was made with observation, history and sound arboricultural and horticultural knowledge. It is always possible that
other, or different problems exist that may contribute to the destabilization, decline and death of trees. Further evaluation may be
warranted if the steps above do not work. Construction activities can seriously disrupt roots and soils and lead to long term
problems that may directly or indirectly cause a tree to decline and die.
This is the group of 6 trees that need removal for Transitional Surface requirements from FAA. Tree 27 leans
and is down in the property below creek.