HomeMy WebLinkAboutTR_Arborist_ReportArborist Report
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February 9, 2024
Prepared by:
David Bigelow
ISA Certified Arborist
Tree Risk Assessment Qualified
PN-9725A
Customer and Location:
Baoping Liu
8825 S 132nd St
Renton, WA 98057
Arborist’s Report
On February 9th, 2024, the trees and tree groups around the property at 8825 S 132nd St were
evaluated by myself to determine their health and potential for risk. The homeowner contacted
me earlier in the week with strong concerns and had mentioned a tree overhanging the home at
8825. Notwithstanding the recommendations and conclusions made in this report, it must be
realized that trees are living organisms and their health and vigor constantly change over time.
They are not immune to changes in site conditions or seasonal variations in the weather.
Scope of Work
This report provides a general assessment of one tree located at 8825. According to King County
GIS information, the property is in proximity of a slope and stream buffer.
The tree has been viewed and measured from the property at 8825. Trees are considered a
‘group’ where several of the same species are growing closely together. Shrubs and hedges are
not included in the assessment.
Summary
The tree that was evaluated is a Bigleaf maple, Acer macrophyllum. NATIVE. This and the other
maples on this site appear to be naturally occurring. The maple of concern is located to the
south of the home, and is subject to the normally occurring prevailing winds, which blow from
the SW to NE. This wind pattern puts the house (and any occupants) at risk, as shown in photo 1.
Arborist Report
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The tree of concern (maple) is located 7.5 feet from the foundation of the home (photo 4) and is
on a 40% (approximate, photo 5) slope. Also of note is the large wound from a previous failure
(as shown in photo 2 and 3). This appears to be a co-dominate tree at one time, and the wound
is from the other stem.
The prior ivy growth has most likely had a detrimental effect on this tree as well, leading to an
increased risk of failure. The combination of these factors classifies this tree as a high risk, as
outlined in the ISA Tree Risk rating matrix.
Methodology
Trees were evaluated with guidelines established by the International Society of Arboriculture’s
Tree Hazard Evaluation Form. The health assessments were performed without excavation or
internal examination such as coring or drilling. No aerial inspection of the upper canopy was
performed.
Recommendations
It is my recommendation that the tree be removed. I do not believe any pruning/pruning
techniques to be an acceptable alternative. The maple should be left at 8-10 feet tall, so that it
can continue to shoot new growth and support its root system.
Comments
Please see attached ISA Tree Risk Assessment form.
Limits
Unless expressed otherwise (1) information contained in this report covers only those items that
were examined and reflects the condition of those items at the time of inspection, and (2) the
inspection is limited to visual examination of accessible items without further dissection,
excavation, probing, or coring.
Loss or alteration of any part of a report invalidates the entire report. There is no warranty or
guarantee expressed or implied that problems or deficiencies of the trees in question may not
arise in the future.
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Respectfully submitted,
David Bigelow
2323 Lincoln St
Everett WA, 98203
(206) 504-0355
dvdbigelow@gmail.com
ISA Certified Arborist #PN9725A
Tree Risk Assessment Qualified
Arborist Report
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Site map
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Photo 1
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Photo 2
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Photo 3
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Photo 4
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Photo 5