HomeMy WebLinkAboutRS_ARBORIST REPORT_210607_V1
Lonnson Arbor Care
2616 169th Street SE
Bothell, WA 98012
425-891-1741
lonnson@juno.com
May 21, 2021
Steve & Lisa Leighton
3307 Mountain View Ave. N
Renton, WA 98056
Re: Tree Report addendum for the address above (Parcel 3124059077).
Steve & Lisa,
This report is in addition to the original Tree Inventory Report dated May 8, 2021. Only the
trees within the property are identified in this document for ease of location and to determine a
new tree planting plan. The included survey map shows the location of trees on site.
Tree Inventory Table (On-Site):
Tag #
Species DSH LOD Viable Condition
5002 Oregon ash
Fraxinus latifolia
12.6”
7.8”
[14.8”]
18.0’ No North stem has excessive decay. Restricted
root area. Canopy topped several years ago.
Probable risk of large part failure. Not viable
because of decay and poor conditions.
5014 Big-leaf maple 9.5”
10.5”
[14.2”]
16.0’ Yes Tree was topped several years ago. No sign
of decay. Rope embedded in part of the
trunk. Improbable risk of whole or large part
failure.
5021 Sweetgum
Liquidambar styraciflua
14.4” 17.0’ Yes Sturdy tree with no signs of decay, disease,
or structural defects. Improbable risk of
whole tree or large part failure.
5022 European hornbeam
Carpinus betulus
12.2”
14.6”
6.9”
[20.2”]
24.0’ Yes Sturdy tree with no signs of decay, disease,
or structural defects. Improbable risk of
whole tree or large part failure.
5025 Honey locust
Gleditsia triacanthos
11.6” 14.0’ No Excessive decay through the trunk.
Asymmetric canopy to the west. Probable
risk of whole tree failure. Not viable because
of decay.
5023 Western hemlock 7.1” 8.0’ Yes Sturdy tree with no signs of decay, disease,
or structural defects. Improbable risk of
whole tree or large part failure.
5024 Sweetgum 10.8” 13.0’ Yes Sturdy tree with no signs of decay, disease,
or structural defects. Improbable risk of
whole tree or large part failure.
______ Trees in shoreline setback.
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There are five (5) trees that are entirely within the property. Two (2) of the trees are not suitable
for preservation which leaves three (3) viable trees. 30% of the three (3) viable trees must be
retained. Retaining one (1) viable tree is required [(3 trees x 0.30) = 0.9, or 1 tree].
All the viable trees in the Retention Table are within and limit the buildable area. All viable
trees need to be removed to obtain a maximum buildable area. The Lot requires a tree density of
two (2) significant trees for every 5,000 square feet (SF), or the combination of existing trees and
new trees equivalent to 12 inches in diameter. This lot is 29,236 SF and therefore requires a tree
density of six (6) significant trees (29,236 SF / 5,000 SF = 5.8, or 6 significant trees). Six (6)
significant trees are equal to a minimum of 36 inches in total diameter.
The minimum size for new trees to comply with tree density are 2” caliper trees (deciduous) or
evergreen (conifer) trees at least 6 feet tall (Code 4-4-130.H.1.e.). The addition of eighteen (18)
new trees of minimum size is needed to comply with tree density requirements (18 trees x 2” dia.
= 36” tree dia.).
Tree Retention/Removal:
Tag # Retain Remove Not
Viable
5002 • •
5014 •
5021 •
5022 •
5025 • •
Total = 7 5 3
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New Tree Recommendations:
The new tree plantings may be part of the landscape design. The following trees are good
choices for residential sites. Smaller, more ornamental species of native trees may include
Excelsior cedar (Thuja plicata ‘Excelsior’), Alaskan cedar (Chamaecyparis pendula), Shore pine
(Pinus contorta), Pacific yew (Taxus brevifolia), and Mountain hemlock (Tsuga mertensiana) for
evergreen types. Deciduous native species appropriate for the site include Serviceberry tree
(Amelanchier alnifolia), dogwoods (Cornus nutellii or Cornus ‘Eddie’s White Wonder’), and
Vine maple (Acer circinatum).
Larger, native evergreen trees include Douglas fir (Psuedotsuga menziesii), Red cedar (Thuja
plicata), Western hemlock (Tsuga heterphyllum), Grand fir (Abies grandis), and Engelmann
spruce (Picea engelmannii).
Please reply if you have questions.
Thank you,
Lonnie Olson, Owner
ISA Certified Arborist (PN-5427A) exp. 12/31/2023
Qualified Tree Risk Assessor (#697) exp. 7/23/2024
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Survey Map: 3307 Mountain View Ave. N.
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