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Lane & Associates Arborist Report
Landscape Architecture
13802 26th Avenue NW
Tulalip, WA 9827
425 885-2319
Lane and Associates was contacted by Jim Howton and was asked to compile an ‘Arborist Report’ for a
site located west of the intersection of Kirkland Avenue NE and NE 15th Street within the City of
Renton.
Date of Field Examination: June 27th, 2018
This report encompasses all of the criteria set forth under City of Renton code section 4-4-130. The tree
retention requirement is 30% of significant trees.
Description
9 significant trees were identified and assessed on the property. These are comprised of a mix of native
species and planted ornamental and fruit species. According to City of Renton code, a significant tree is
a “tree with a caliper of at least six inches (6"), or an alder or cottonwood tree with a caliper of at least
eight inches (8"). Trees qualified as dangerous shall not be considered significant. Trees planted within
the most recent ten (10) years shall qualify as significant trees, regardless of the actual caliper.”
Each tree in this report was visited. Tree diameters were measured by tape. Each tree was visually
examined for defects and vigor. The tree assessment procedure involves the examination of many
factors:
The crown of the tree is examined for current vigor. This is comprised of inspecting the crown
(foliage, buds and branches) for color, density, form, and annual shoot growth, limb dieback and
disease. The percentage of live crown is estimated for coniferous species only and scored
appropriately.
The bole or main stem of the tree is inspected for decay, which includes cavities, wounds,
fruiting bodies of decay (conks or mushrooms), seams, insects, bleeding, callus development, broken or
dead tops, structural defects and unnatural leans. Structural defects include crooks, forks with V-shaped
crotches, multiple attachments, and excessive sweep.
The root collar and roots are inspected for the presence of decay, insects and/or damage, as
well as if they have been injured, undermined or exposed, or original grade has been altered.
A ‘viable’ tree is “A significant tree that a qualified professional has determined to be in good health,
with a low risk of failure due to structural defects, is wind firm if isolated or remains as part of a grove,
and is a species that is suitable for its location.” Trees considered ‘non-viable’ are trees that are in
poor condition due to disease, age related decline, have significant decay issues and/or cumulative
structural defects, which exacerbate failure potential.
Tree Retention Calculation
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A total of 9 significant trees were identified on the subject property. Three of the significant trees are in
poor condition. These three non-viable trees were not included in the tree calculation.
Landmark trees and tree groves were prioritized when selecting trees for retention, per the City of
Renton tree
code 4-4-130.
Note: See ‘Tree Map’
Tree Calculation based on 6, healthy, viable, Significant trees
Viable Trees proposed for removal – 6 (100%)
Viable Trees proposed for retention – 0 (0%)
Tree Type
Removal
Retained
Total
Landmark #
1
0
1
Landmark %
100%
0%
100%
Significant #
5
0
5
Significant %
100%
0%
100%
Total #
6
0
6
Total %
100%
0%
100%
Tree Replacement Calculation
Significant Trees required for retention equals 20% of 6 viable trees = 1
Replacement Ratio: 12 caliper inches of new trees/ required significant trees x12
Caliper inches of new trees required (min. 2” cal.) 12 inches
(Minimum (6) 2” caliper trees required)
Submitted by:
Bruce Cameron Lane Landscape Architect
There is no warranty suggested for any of the trees subject to this report.
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TREE #1 MAPLE
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TREE #2 PLUM
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TREE #3 CHERRY
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TREE #4 CHERRY
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TREE #5 APPLE
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TREE # 6
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TREE #7
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TREE #8
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TREE #9