HomeMy WebLinkAboutTR_Arborist_Report_2018.pdf Greenforest Incorporated
C o n s u l t i n g A r b o r i s t
4547 South Lucile Street, Seattle, WA 98118 Tel. 206-723-0656
TO: Carlos Arias, Project Engineer
4G Development and Consulting, Inc.
P.O. Box 270571
San Diego CA 92198
REFERENCE: Arborist Report, BCE #18963
SITE ADDRESS: 361 Rainier Ave., Renton WA
DATE: August 7, 2018
PREPARED BY: Favero Greenforest, ISA Certified Arborist # PN -0143A
ISA Tree Risk Assessment Qualified
ASCA Registered Consulting Arborist® #379
INTRODUCTION
You contacted me and contracted my services as a consulting arborist. My assignment is to
tag, assess and inventory the regulated trees at the above referenced site. The purpose of
this report is to establish the condition of the significant trees to satisfy City of Renton
permit submittal requirements.
I received a site plan from Barghausen Consulting Engineers dated 6/28/18. I visited the site
7/12/2018 and visually inspected the trees indicated on the survey, which are the subject of
this report.
SUMMARY
The following table summarizes the tree quantities and categories inventoried in this report.
Significant, Heritage, Landmark and Dangerous categories are defined by municipal code.
Significant Trees on Site 5
Heritage Trees on Site 0
Landmark Trees on Site 0
Dangerous Trees on Site 0
Total Subject Trees 5
One significant tree is proposed for retention, and 4 for removal.
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 2 of 10
Greenforest Registered Consulting Arborist
Attributes for 18 offsite and 2 ROW trees are also included in this report.
The site is a vacant commercial parcel. The subject trees are all ornamental deciduous
species. Except for the 2 street trees, there were installed during previous site development
as parking lot landscape amenity. A row of evergreen arborvitae are included in the survey,
yet are too small to be regulated.
LIMITATIONS AND USE OF THIS REPORT
This tree report establishes, via the most practical means available, the existing conditions
of the trees on the subject property. Ratings for health and structure, as well as any
recommendations are valid only through the development and construction process. This
report is based solely on what is readily visible and observable, without any invasive means.
There are several conditions that can affect a tree’s condition that may be pre-existing and
unable to be ascertained with a visual-only analysis. No attempt was made to determine the
presence of hidden or concealed conditions which may contribute to the risk or failure
potential of trees on the site. These conditions include root and stem (trunk) rot, internal
cracks, structural defects or construction damage to roots, which may be hidden beneath
the soil. Additionally, construction and post-construction circumstances can cause a
relatively rapid deterioration of a tree’s condition.
SPECIES AND SIZE OF EACH TREE
I measured the trunk diameter (54” from grade) of each tree, and identified each tree by
common name.
IDENTIFICATION SCHEME
Tree numbers used on the topographic survey (see attached) are used in inventory of this
report.
TREE INSPECTION METHOD – TREE HEALTH, CONDITION AND VIABILITY
I visually inspected each tree from the ground. I performed a Level 1 risk assessment.1 This
is the standard assessment for populations of trees near specified targets, conducted in
order to identify obvious defects or specified conditions such as a pre-development
inventory. This is a limited visual assessment focuses on identifying trees with imminent
and/or probable likelihood of failure, and/or other visible conditions that will affect tree
retention.
1 Companion publication to the ANSI A300 Part 9: Tree Shrub and Other woody Plant Management – Standard
Practices, Tree Risk Assessment. 2011. ISA.
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 3 of 10
Greenforest Registered Consulting Arborist
I recorded tree species, size (DBH) and dripline. I rated the condition of each tree, both
health and structure. A tree’s structure is distinct from its health. This inspection identifies
what is visible with both.
High-risk trees can appear healthy in that they can have a dense, green canopy. This may
occur when there is sufficient sapwood or adventitious roots present to maintain tree
health, but inadequate strength for structural support.
Conversely, trees in poor health may or may not be structurally stable. For example, tree
decline due to root disease is likely to cause the tree to be structurally unstable, while
decline due to drought or insect attack may not.
One way that tree health and structure are linked is that healthy trees are more capable of
compensating for structural defects. A healthy tree can develop adaptive growth that adds
strength to parts weakened by decay, cracks, and wounds.
This report identifies unhealthy trees based on existing health conditions and tree structure,
and specifies which trees are most suitable for preservation.2
No invasive procedures were performed on any trees. The results of this inspection are
based on what was visible at the time of the inspection.
The attached inventory summarizes my inspection results and provides the following
information for each tree:
Tree Category as defined by municipal code.
Dangerous: Any tree that has been certified, in a written report, as dead,
terminally diseased, damaged, or otherwise dangerous to persons or property
by a licensed landscape architect, or certified arborist.
Landmark: A tree with a caliper of thirty inches (30") or greater. (Average
multiple stems and report single integer.)
Significant: 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.
Proposed Action – Indicates if tree is to be removed or retained.
Tree number as shown on attached exhibit.
2 Companion publication to the ANSI A300 Part 5: Tree Shrub and Other woody Plant Maintenance – Standard
Practices, Managing Trees During Construction. 2008. ISA.
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 4 of 10
Greenforest Registered Consulting Arborist
DBH Stem diameter in inches measured 4.5 feet from the ground.
Tree Species Common name.
Dripline Average branch extension from the trunk as radius in feet.
Health and Structure ratings ‘1’ indicates good to excellent condition; no visible
health-related problems or structural defects, ‘2’ indicates fair condition; minor
visible problems or defects that may require attention if the tree is retained, and
‘3’ indicates poor condition; significant visible problems or defects and tree
removal is recommended.
Comments on Condition Obvious structural defects or diseases visible at time of
inspection.
Viability - a determination by the arborist whether the tree is viable for retention.
Type indicates if tree is Deciduous (D) or Evergreen (E).
IMPACT OF NECESSARY TREE REMOVAL
The removal of any or all of the 5 subject trees will have no impact on any trees that remain,
either on or off-site.
TREE RETENTION AND LAND CLEARING REGULATIONS
4.4.130 §H.9. Protection Measures During Construction: Protection measures in this
subsection shall apply for all trees that are to be retained. All of the following tree protection
measures shall apply:
a. Construction Storage Prohibited: The applicant may not fill, excavate, stack or store any
equipment, dispose of any materials, supplies or fluids, operate any equipment, install
impervious surfaces, or compact the earth in any way within the area defined by the
dripline of any tree to be retained.
b. Fenced Protection Area Required: Prior to development activities, the applicant shall erect
and maintain six-foot (6') high chain link temporary construction fencing around the
driplines (except for within active driveways) of all retained trees or at a distance
surrounding the tree equal to one and one-quarter feet (1.25') for every one inch (1")
of trunk caliper, whichever is greater, or along the perimeter of a tree protection
tract. Placards shall be placed on fencing every fifty feet (50') indicating the words,
“NO TRESPASSING – Protected Trees,” or on each side of the fencing if less than fifty
feet (50'). Site access to individually protected trees or groups of trees shall be fenced
and signed. Individual trees shall be fenced on four (4) sides. In addition, the applicant
shall provide supervision whenever equipment or trucks are moving near trees.
c. Protection from Grade Changes: If the grade level adjoining to a tree to be retained is to
be raised, the applicant shall construct a dry rock wall or rock well around the tree.
The diameter of this wall or well must be equal to the tree’s drip line.
d. Impervious Surfaces Prohibited within the Drip Line: The applicant may not install
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 5 of 10
Greenforest Registered Consulting Arborist
impervious surface material within the area defined by the drip line of any tree to be
retained.
e. Restrictions on Grading within the Drip Lines of Retained Trees: The grade level around
any tree to be retained may not be lowered within the greater of the following areas:
(i) the area defined by the drip line of the tree, or (ii) an area around the tree equal to
one and one-half feet (1-1/2') in diameter for each one inch (1") of tree caliper. A
larger tree protection zone based on tree size, species, soil, or other conditions may
be required. (Ord. 5676, 12-3-2012)
f. Mulch Layer Required: All areas within the required fencing shall be covered completely
and evenly with a minimum of three inches (3") of bark mulch prior to installation of
the protective fencing. Exceptions may be approved if the mulch will adversely affect
protected ground cover plants. (Ord. 5676, 12-3-2012)
g. Monitoring Required during Construction: The applicant shall retain a certified arborist or
licensed landscape architect to ensure trees are protected from development
activities and/or to prune branches and roots, fertilize, and water as appropriate for
any trees and ground cover that are to be retained.
h. Alternative Protection: Alternative safeguards may be used if determined to provide equal
or greater tree protection. (Ord. 5676, 12-3-2012)
Attachments:
1. Assumptions and Limiting Conditions
2. Certification of Performance
3. Significant Tree Inventory
4. Tree Number Exhibit
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 6 of 10
Greenforest Registered Consulting Arborist
Attachment No. 1 - Assumptions & Limiting Conditions
1. A field examination of the site was made 7/12/2018. My observations and
conclusions are as of that date.
2. Care has been taken to obtain all information from reliable sources. All data has
been verified insofar as possible; however, the consultant/arborist can neither
guarantee nor be responsible for the accuracy of information provided by others.
3. I am not a qualified land surveyor. Reasonable care was used to match the trees
indicated on the sheets with those growing in the field.
4. Construction activities can significantly affect the condition of retained trees. All
retained trees should be inspected after construction is completed, and then
inspected regularly as part of routine maintenance.
5. Unless stated other wise: 1) information contained in this report covers only those
trees that were examined and reflects the condition of those trees at the time of
inspection; and 2) the inspection is limited to visual examination of the subject trees
without dissection, excavation, probing, or coring. There is no warranty or
guarantee, expressed or implied that problems or deficiencies of the subject tree
may not arise in the future.
6. All trees possess the risk of failure. Trees can fail at any time, with or without
obvious defects, and with or without applied stress. A complete evaluation of the
potential for this (a) tree to fail requires excavation and examination of the base of
the subject tree. Permission of the current property owner must be obtained before
this work can be undertaken and the hazard evaluation completed.
7. The consultant/appraiser shall not be required to give testimony or to attend court
by reason of this report unless subsequent contractual arrangements are made.
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 7 of 10
Greenforest Registered Consulting Arborist
Attachment No. 2 - Certification of Performance
I, Favero Greenforest, certify that:
• I have personally inspected the trees and the property referred to in this report and
have stated my findings accurately.
• I have no current or prospective interest in the vegetation or the property that is the
subject of this report and have no personal interest or bias with respect to the parties
involved.
• The analysis, opinion, and conclusions stated herein are my own and are based on
current scientific procedures and facts.
• My analysis, opinion, and conclusions were developed and this report has been
prepared according to commonly accepted arboricultural practices.
• No one provided significant professional assistance to me, except as indicated within
the report.
• My compensation is not contingent upon the reporting of a predetermined
conclusion that favors the cause of the client of any other party nor upon the results
of the assessment, the attainment of stipulated results, or the occurrence of any
subsequent events.
I further certify that I am a member in good standing of International Society of
Arboriculture (ISA), and the ISA PNW Chapter, I am an ISA Certified Arborist (#PN-0143A) and
am Tree Risk Assessment Qualified, and am a Registered Consulting Arborist® (#379) with
American Society of Consulting Arborists. I have worked as an independent consulting
arborist since 1989.
Signed:
GREENFOREST, Inc.
By Favero Greenforest, M. S.
Date: August 7, 2018
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 8 of 10
Greenforest Registered Consulting Arborist
Attachment No. 3 – Significant Tree Inventory
Category
Proposed
Action Tree No. DBH Species Dripline Health Structure Comments on Condition Viability Tree Type Significant Remove 150299 20.1” Red maple 16’ 1 2 Growth obstruction
(concrete curb)
Yes D
Significant RETAIN 150300 20.9” Red maple 16’ 1 2 Yes D
Significant Remove 950429 13.6” Red maple 8’ 1 2 Yes D
Significant Remove 950430 8.3” Red maple 6’ 1 2 Growth obstruction, trunk
wound Yes D
Significant Remove 950774 14.1” Red maple 13’ 1 1 Yes D
OFFSITE TREES
Not
regulated;
too small.
150240
(2-4) 2-3”
Emerald
Green
arborvitae
3’ 1 1 E
150241 5’ 1 1 E
150242 4’ 1 1 E
150243 4’ 1 1 E
150244 4’ 1 1 E
150245 5’ 1 1 E
150246 4’ 1 1 E
150247 3’ 1 1 E
150248 3’ 1 1 E
150249 4’ 1 1 E
Significant 950363 9.8” Red maple 5’ 1 2 Trunk wound D
Significant 950364 11.9” Red maple 5’ 1 2 Concrete curb, multiple
leaders with included bark D
Significant 950365 10.2” Red maple 10’ 1 2 Concrete curb D
Carlos Arias, Project Engineer, 4G Development and Consulting, Inc.
RE: Arborist Report, BCE #18963, 361 Rainier Ave., Renton WA
August 7, 2018
Page 9 of 10
Greenforest Registered Consulting Arborist
Category
Proposed
Action Tree No. DBH Species Dripline Health Structure Comments on Condition Viability Tree Type Significant 951287 14.4” Hornbeam 11’ 1 1 D
Significant 951313 7.5” Callery pear 6’ 2 1 Trellis disease fungus,
stressed
D
Significant 951317 7.2” Callery pear 7’ 2 1 D
Significant 951418 18.1” Red maple 16’ 1 1 D
Significant 951476 14.8” Red maple 12’ 1 1 D
Significant 951477 20.3” Red maple 14’ 1 1 D
Significant A 10” Red maple 6’ 1 1 D
RIGHT-OF WAY TREES
Street Tree 950612 6” Zelkova 6’ 1 1 D
Street Tree 950613 5.1” Zelkova 5’ 1 1 D