HomeMy WebLinkAboutFrench Hospital Arborist Report_1_Oct 2020
GREENVALE TREE COMPANY
October 28, 2020
Arborist Report
For: Ariana Melendez
Studio Design Group Architects, Inc.
Site: French Hospital rear parking area, north and west of parking, near modular area.
Plant ID Eucalyptus globulus (Blue Gum Eucalyptus)
Task Removal for proposed FAA requirements.
Definition: Transitional Surface – An area not directly below a flight path that allows for
clearance on either side.
Observations These are general observations. Individual trees may have some variance from
these observations.
Canopy – leaf color is good to poor. Some trees have foliage that is discolored
and even yellowed. Some trees have considerable defoliation and dieback. Trees
closer to the creek appear much more vibrant and vigorous. Leaves are being
eaten by Tortoise Beetle.
Branches – The trees furthest west (and close to modular) appear to have
considerable dieback with some main limbs dead or dying. Limbs on these trees
(in general for the area) are very tangled and dense. Most trees have some poor
attachments and some narrow-angled branches. Narrow angled branches tend to
have included bark.
Trunks/stems – Nearly all these trees are multi-stem, having very narrow stem
angles with included bark. Stems have a tendency to lean away from one another
and have the weight and leverage of the canopy off center of balance.
Conclusion The FAA has concluded that these trees exceed height limits for medivac
helicopters taking off from the hospital. These trees are in the flight path proposed
for the FAA.
Trees are in poor health overall and in the western area near the modular unit, it
appears as if there is a pathogen at work. Most, if not all, trees have been affected
by the prolonged drought.
Recommendations
Remove all trees in this area (per plan) to meet FAA requirements.
See photos below for more information
Sincerely
Chris Stier,
ISA Certified Arborist, #WE9262-A
*diagnosis 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 d ecline and death of plants. Further
evaluation may be warranted if the steps above do not work. Pathology tests and other lab analysis are available.
Plan calls for removal of these trees that are in the “transitional surface” of the flight path. These trees are to close to the proposed
path.
Modular
Direction of flight path departure
These are most of the trees that would need removal. The helicopters would have a low
trajectory of takeoff close to these trees within the “transitional surface” area.
Trees are close together and branches are a tangle. Proximity between the trees has caused stems
and branches to grow outward causing leans and off centered weight.
Multi stemmed trunks with narrow angles and included bark have a greater potential to fail in
wind events.
Tree #302 has considerable dieback and the trees around this one has more dieback than a
healthy tree should. It is likely a pathogen has caused a root or crown rot in this area.
Trees are tall enough that flight safety is at risk during departure when trajectories are low. To
meet the required FAA “transitional surface” regulation these need to be removed.