HomeMy WebLinkAboutD_Children's Institute Dangerous Tree Removal_Critical Areas ExemptionDEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
PLANNING DIVISION
CERTIFICATE OF EXEMPTION
FROM CRITICAL AREAS REGULATIONS
EVALUATION FORM & DECISION
DATE: January 7, 2021
PROJECT NUMBER: LUA21-000015, CAR
PROJECT NAME: Children’s Institute Dangerous Tree Removal Critical
Areas Exemption
PROJECT MANAGER: Angelea Weihs, Associate Planner
OWNER: Children's Institute for
Learning Differences
4030 86th Ave SW
Mercer Island, WA 98040
APPLICANT/CONTACT: Ray Robinson
Integrated Site Design, Inc
12743 26th Ave NE
Seattle, WA 98125
PROJECT LOCATION: 2640 Benson Road S
PROJECT DESCRIPTION: The applicant, Children's Institute for Learning
Differences, is requesting approval of a Critical Areas Exemption in order to remove 6 high-
risk hazardous trees and prune 3 trees on the site located at 2640 Benson Road S
(Attachment A). The site is within the Residential-8 (R-8) Zone and is 175,111 square feet.
The site is presently used as a private school. The site contains sensitive and protected
slopes, high landslide hazards, moderate coalmine hazards, and high coalmine hazards
within 50 feet of the site. An arborist report prepared by Rippey Arboriculture, LLC, was
submitted with the project application (Attachment C). The purpose of the tree removal is
to prevent damage by hazardous trees to parking lots and drive lanes within the subject
property (Attachment B). The applicant states that, should the trees fail, the risk of impact
to parking areas and drive aisle areas is high. The applicant proposes to remove/prune
these high-risk trees while they conduct further analysis regarding other hazardous trees
located on site. This permit is only for the removal of the 6 trees and pruning of 3 trees
circled in red as shown on Attachment A. The applicant has inquired about further tree
removal on the property, which would be reviewed under a separate permit. The other
trees identified for removal in the Arborist report would be reviewed as part of the
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City of Renton Department of Community & Economic Development Certificate of Exemption from Critical Areas Regulations
Children’s Institute Dangerous Tree Removal Critical Areas Exemption LUA21-000015
DATE OF PERMIT: January 7, 2021 Page 2 of 3
separate permit. City Arborist, Ian Gray, concurs with the assessment of these trees and
recommends removal.
CRITICAL AREA: Sensitive and Protected Slopes, High Landslide
Hazards, Moderate and High Coal Mine Hazards
EXEMPTION JUSTIFICATION: Renton Municipal Code, Section 4-3-050C.3.c.iii.
Dangerous Trees: Removal of non-native invasive ground cover or weeds listed by King
County Noxious Weed Board or other government agency or dangerous trees, as defined in
Chapter 4-11 RMC which have been approved by the City and certified dangerous by a
licensed landscape architect, or certified arborist, selection of whom to be approved by the
City based on the type of information required. Limited to cutting of dangerous trees; such
hazardous trees shall be retained as large woody debris in critical areas and/or associated
buffers, where feasible.
FINDINGS: The proposed development is consistent with the following findings pursuant to
RMC section 4-3-050.C.2.d:
i. The activity is not prohibited by this or any other provision of the Renton Municipal
Code or State or Federal law or regulation;
ii. The activity will be conducted using best management practices as specified by
industry standards or applicable Federal agencies or scientific principles;
iii. Impacts are minimized and, where applicable, disturbed areas are immediately
restored;
iv. Where water body or buffer disturbance has occurred in accordance with an
exemption during construction or other activities, revegetation with native vegetation
shall be required;
v. If a hazardous material, activity, and/or facility that is exempt pursuant to this
Section has a significant or substantial potential to degrade groundwater quality, then
the Administrator may require compliance with the Wellhead Protection Area
requirements of this Section otherwise relevant to that hazardous material, activity,
and/or facility. Such determinations will be based upon site and/or chemical-specific
data.
DECISION: An exemption from the critical areas regulations is approved.
DATE OF DECISION ON LAND USE ACTION:
SIGNATURE:
________________________________________________________ ________________
Vanessa Dolbee, Planning Director Date
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1/7/2021 | 3:33 PM PST
City of Renton Department of Community & Economic Development Certificate of Exemption from Critical Areas Regulations
Children’s Institute Dangerous Tree Removal Critical Areas Exemption LUA21-000015, CAR
DATE OF PERMIT: January 7, 2021 Page 3 of 3
The administrative land use decision will become final if the decision is not appealed within 14
days of the decision date.
APPEALS: This administrative land use decision will become final if not appealed in writing to
the Hearing Examiner on or before 5:00 PM on January 21, 2021. An appeal of the decision
must be filed within the 14-day appeal period (RCW 43.21.C.075(3); WAC 197-11-680). Due
to Governor Jay Inslee’s Proclamation 20-25 (“Stay Home, Stay Healthy”), the City Clerk’s
Office is working remotely. For that reason, appeals must be submitted electronically to the
City Clerk at cityclerk@rentonwa.gov. The appeal fee, normally due at the time an appeal is
submitted, will be collected at a future date. Appeals to the Hearing Examiner are governed by
RMC 4-8-110 and additional information regarding the appeal process may be obtained from
the City Clerk’s Office, cityclerk@rentonwa.gov. If the situation changes such that the City
Clerk’s Office is open when you file your appeal, you have the option of filing the appeal in
person.
RECONSIDERATION: Within 14 days of the decision date, any party may request that the
decision be reopened by the approval body. The approval body may modify his decision if
material evidence not readily discoverable prior to the original decision is found or if he finds
there was misrepresentation of fact. After review of the reconsideration request, if the
approval body finds sufficient evidence to amend the original decision, there will be no further
extension of the appeal period. Any person wishing to take further action must file a formal
appeal within the 14-day appeal time frame.
EXPIRATION: Five (5) years from the date of decision (date signed).
Attachments: A) Site Plan, B) Project Narrative and C) Arborist Report
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From: Christopher Rippey <chris@rippeyarboriculture.com>
Sent: Tuesday, January 05, 2021 5:24 PM
To: Angelea Weihs; Ray Robinson
Cc: Carrie Fannin
Subject: RE: CHILD - Routine Vegetation Management Permit
Hello Angela,
Limiting access under the canopy of the trees which are posing imminent hazard would not adequately
mitigate the risk related to these trees. Several of the trees that I am most concerned about are trees
that are likely to fail at their root system where the entire tree would fall and impact an area as far out
from the base of the tree as the tree is tall. Two trees where this is the case are next to the parking lot.
These trees will impact an area of about 100’ into the parking area. Another tree that I am concerned
about is overhanging the driveway to the school parking lot. Blocking off the area under this tree will
mean blocking off the access to the school’s parking lot.
Just to state my experience in mitigating tree related risk, I have been Tree Risk Assessor Qualified
through the International Society of Arboriculture for nearly 10 years, I am the founder of the Pacific
Northwest Tree Failure Database, I write a quarterly article about tree failures for the Pacific North West
Chapter of the International Society of Arboriculture, and was the Arborist for both Stanford University
and the City of Seattle Parks. These trees are high risk and need to be removed as soon as possible to
provide adequate public safety.
From: Angelea Weihs <AWeihs@Rentonwa.gov>
Sent: Tuesday, January 5, 2021 4:24 PM
To: Ray Robinson <r.robinson@i-s-d.com>
Cc: Carrie Fannin <carrie@CHILDnow.org>; Christopher Rippey <chris@rippeyarboriculture.com>
Subject: RE: CHILD - Routine Vegetation Management Permit
Hello,
I forgot to cc other parties. See below.
Thank you,
Angelea Weihs
Associate Planner, City of Renton
1055 S. Grady Way
Renton, WA 98057
(425) 430-7312
From: Angelea Weihs
Sent: Tuesday, January 5, 2021 4:22 PM
CAUTION: This email originated from outside the City of Renton. Do not click links, reply or open
attachments unless you know the content is safe.
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To: Ray Robinson <r.robinson@i-s-d.com>
Subject: RE: CHILD - Routine Vegetation Management Permit
Hello Ray,
Tree removal without the required permit approval is not permitted. I am very surprised the school is
open at this time during Covid. If there are concerns, I would suggest putting up temporary tree
protection fencing around the dripline of the trees to prevent access around the concerning trees.
Thank you,
Angelea Weihs
Associate Planner, City of Renton
1055 S. Grady Way
Renton, WA 98057
(425) 430-7312
From: Ray Robinson <r.robinson@i-s-d.com>
Sent: Tuesday, January 5, 2021 4:08 PM
To: Angelea Weihs <AWeihs@Rentonwa.gov>
Cc: Carrie Fannin <carrie@CHILDnow.org>; Christopher Rippey <chris@rippeyarboriculture.com>
Subject: FW: CHILD - Routine Vegetation Management Permit
Importance: High
Angelea,
We are making fairly good headway in completing all the requested permit documents and will be
sending them once we have the Geotechnical Report.
In a recent conversation with Chris Rippey, there is significant concern about a number of trees that
pose an immediate risk to students and staff at CHILD.
Specifically, these include:
· North of main building/south of play area: (2) trees need removal, (4) trees need corrective
pruning
· Parking lot: (4) trees need removal
Can these trees be removed/pruned as an emergency measure now while the permit documents are
being prepared?
Chris Rippey is available to provide you with the specifics and can be reached by email
chris@rippeyarboriculture.com or phone 253-247-1980
Please let me know at your convenience.
CAUTION: This email originated from outside the City of Renton. Do not click links, reply or open
attachments unless you know the content is safe.
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Much Thanks
From: Christopher Rippey <chris@rippeyarboriculture.com>
Sent: Tuesday, January 5, 2021 3:33 PM
To: Ray Robinson <r.robinson@i-s-d.com>
Cc: Carrie Fannin <carrie@CHILDnow.org>
Subject: Re: CHILD - tree removal process
Yes, they are hazardous.
Several of the maple tree are infected with Cryptostroma corticale that can cause respiratory infections
is humans. There are also several large dead trees on the retaining wall east of the parking lot that will
impact the parking stalls when they fail. As someone who has managed tree related risk for Stanford
University and Seattle Parks, all the to-be removed trees needed to be removed when we first identified
them in fall of 2020. I think it is unwise for Renton Planning Department to delay the removal of these
trees. In my experience, the typical municipal protocol for hazardous trees, would be for them to allow
us to remove the trees and apply for a permit post removal.
Chris Rippey
Consulting Arborist, Rippey Arboriculture
www.RippeyArboriculture.com
253-247-1980
From: Ray Robinson <r.robinson@i-s-d.com>
Sent: Tuesday, January 5, 2021 6:52:20 AM
To: Christopher Rippey <chris@rippeyarboriculture.com>
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D
Cc: Carrie Fannin <carrie@CHILDnow.org>
Subject: RE: CHILD - tree removal process
Chris,
Thanks for getting to this…….Carrie asked if there is a danger to the children from trees falling.
Per the email threads below, I indicated you would be in the best position to assess the likelihood of
trees falling…….I also stated there are numerous factors and that there is not a way to accurately predict
this.
She indicates that students are kept out of the forested areas, but are in other areas (parking lot and
play area) where trees are a concern.
Based on your familiarity of the trees and the site, in your opinion, are there trees that are of immediate
concern?
If you think there trees that may be a hazzard now, can you identify these areas and cordon them off
sufficiently to keep staff and students out of harms way?
I look forward to hearing back.
Thanks,
From: Carrie Fannin <carrie@CHILDnow.org>
Sent: Monday, January 4, 2021 3:25 PM
To: Ray Robinson <r.robinson@i-s-d.com>
Subject: RE: CHILD - tree removal process
Thank you for the update. I appreciate it. We have no more than 28 students on campus right now (no more than 5 per
classroom (6 classrooms on site; one is 100% remote) according to current guidelines), so we are continuing to operate on a
hybrid model.
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Arboreal Report
Date: January 5th, 2021
To: Carrie Fannin, Executive Director
Children’s Institute for Learning Differences (CHILD)
From: Chris Rippey, Rippey Arboriculture LLC
Subject: Result of a tree risk survey
Introduction
This report is the summary of an October 9th, 2020
tree inventory at 2640 Benson Road South in
Renton, Washington. This survey was performed
to address a City of Renton requirement that a tree
risk survey must be performed every two years.
My scope of work was to:
• Inspect all trees at Children’s Institute for
Learning Differences at 2640 Benson
Road South in Renton, Washington.
• Using a two-year timeframe, identify any
tree or tree part that is likely to fail and
impact the zipline area, wooded trail,
parking lot, playground, driveway, school
buildings or school walkways.
• Attach an identification tag to each
identified tree that meets the before
mentioned categorization.
• Offer care recommendations for each
identified tree.
Limitations and Assumptions
The site and tree assessments were performed on
the subject property only. All tree assessments
were performed from the ground only, no aerial or
below soil level investigation techniques were
used. No advanced assessment tools including
resistance drilling, sonic tomography imaging or
ground penetrating radar were used. Any
information provided was assumed to be true.
All trees will eventually fail. Tree failures are the
result of a combination of factors. Predicting
precisely when or how trees will fail is not
possible. Unless fully removed, all trees pose
some amount of risk to humans.
My assessments and care recommendations do not
consider targets or the occupancy rates of targets
which the assessed trees could damage. These
recommendations do not consider the risk
tolerances of the tree owner. Tree assessments and
recommendations are not meant to be relied upon
as fact or promises of a result. These assessments
and care recommendations are only considerations
for the tree owner’s decision-making process. The
tree owner, and not Rippey Arboriculture LLC is
responsible and potentially liable for the assessed
tree and damages that it may cause.
Site Assessment
The subject property is a 4.01-acre parcel on the
southern tip of east side of Renton. This parcel on
a western facing slope. The southern half of the
property is developed with the school, a
playground, and parking lot. The northern half of
the property is relatively undeveloped with a
zipline and a trail through a wooded area.
Tree Assessment
The trees on this site are a mixture of Pacific
Northwest native trees. The dominant tree on the
site is big leaf maple (Acer macrophyllum). The
next most observed tree was black cottonwood
(Populus trichocarpa), followed by red alder
(Alnus rubra). Most of the trees on the property
were declining in health or dead. There are few
trees in good health.
Most trees of this site declining in health or being
dead is due to several factors including the trees
having limited access to water due their location
on slopes and the presence of aggressive
understory plants like grass, blackberry and ivy
taking up much of the rainwater. There are also
several possible biotic disorders affecting the trees
on the site. These include the parasitic fungal
infections of Kretzchmaria duesta, Ganoderma
sp., and Cryptostroma corticale. The
identifications of these organisms are based on my
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22-year experience in identifying wood decay
causing fungus.
The presence of both organisms is concerning but
is not unexpected. These organisms are common
to our area and well known to cause death or tree
failure in infected trees. Both organisms are
untreatable but infected trees should be removed
as soon as possible to reduce fungal spore
presences and slow the spread of these organisms
throughout the site.
The timing of removing sooty bark disease
infected trees is particularly important because the
spores produced by the organism by the organism
can infect humans with respiratory infections. To
limit this hazard to users of the area, trees should
be removed in winter during wet weather but not
cold dry weather as this is when spores are most
active. December is usually the best time to
schedule work of trees infected with this disease.
Site Assessment Results
My site assessment has identified 24 trees that are
likely fail within the next two years and impact the
specified areas. Nine of these trees (1808, 1856,
1853, 1814, 1684, 1776, 1775, 1774 and 1755) are
along the nature trail used by children of the
school. These trees are all dead and can impact the
trail and strike trail users when they fall. These
trees should all be removed, or if safe to climb,
reduced to wildlife habitat snags of a height no
taller that the distance of the tree to the trail.
Tree 1687 is in the natural area and is leaning
towards the adjacent property. This tree needs to
be removed because it is extensively decayed and
will impact the adjacent property and apartment
homes when it fails.
There are six trees (1888, 1872, 1868, 1869, 1807,
1906, and 1889) located near a zipline area that is
frequently used by children at the school. Three of
these trees will be removed because they are dead
and when they fail, they will likely impact the
zipline area and could impact any users of that
area. All other trees have large dead branches over
hanging the area that must be removed before they
fall on the zipline or the children using the zipline
area.
Tree 2495 is located on the school grounds. This
tree is extensively decayed and is adjacent to a
school walkway. When it fails, this tree will fail
onto this frequently used walkway and can injure
anyone using the walkway.
All other trees (2022, 2613, 1978, 1977, 1976.
1926 and 1994) are dead or severely declining in
health. These trees are all tree species that will
start to shed dead branches soon after dying. These
trees should all be removed because they are all
adjacent to the parking lot and these dead branches
or whole dead trees will impact the parking lot,
users or the parking lot or cars in the parking lot
when they fail.
Specific recommendations for each identified tree
can be found in the following Tree Inventory
section of this report.
Christopher Rippey
Rippey Arboriculture, LLC
PNW-ISA 2019, Arborist of the Year
ASCA Registered Consulting Arborist #633
ASCA Tree and Plant Appraisal Qualified
ISA Certified Arborist (WE-7672AUTM)
ISA Tree Risk Assessor Qualified
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Tree Inventory
Tree
ID
Tree Species DBH Height Condition Present Decay
Organism
Work Notes and
target
1888 Big leaf Maple
(Acer
macrophyllum)
68 80 Declining Kretzchmaria
duesta (aggressive
root decay
organism)
Pruning:
remove upper
portion of
eastmost trunk.
5 trunks. Dead
trunk will
impact zipline
when it fails
1872 Big leaf Maple
(Acer
macrophyllum)
17 80 Declining Kretzchmaria
duesta(aggressive
root and trunk
decay organism)
Remove Decayed at
base. Will
impact zipline
when it fails.
1869 Big leaf Maple
(Acer
macrophyllum)
36 85 Declining Kretzchmaria
duesta(aggressive
root and trunk
decay organism)
Pruning:
remove dead
branch over
zipline.
2 large parent
branches at 5’.
Dead branch
will impact
zipline when it
fails.
1807 Big leaf Maple
(Acer
macrophyllum)
35 50 Dead Remove Tree will fail
onto zipline
area when it
fails.
1868 Big leaf Maple
(Acer
macrophyllum)
6 20 Dead Remove Tree will fail
onto zipline
area when it
fails.
1906 Big leaf Maple
(Acer
macrophyllum)
14 50 Dead Remove Tree will fail
onto zipline
area when it
fails.
1889 Big leaf Maple
(Acer
macrophyllum)
126 80 Declining Sooty bark disease
(can cause
respiratory
infection in
humans) and
Kretzchmaria
duesta (aggressive
root and trunk
decay organism),
sooty bark disease
(can cause
respiratory
Pruning:
remove 3
trunks, remove
any dead wood
over 4”
diameter
Dead tree
branches will
impact zipline
area or
driveway when
they fail.
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1978 Red alder (Alnus
rubra)
12 25 Dead Remove Dead snag.
Will impact
driveway when
it fails.
1977
Black
cottonwood
(Populus
trichocarpa)
31 100 Declining Remove Upper canopy
is dead. Will
impact parking
lot when dead
trunks or
branches fail.
1976 Black
cottonwood
(Populus
trichocarpa)
32 100 Declining Remove Upper canopy
is dead. Will
impact parking
lot when dead
trunks or
branches fail
2613 Big leaf Maple
(Acer
macrophyllum)
20 45 Dead Remove Will impact
parking lot
when tree fails.
2495 Big leaf Maple
(Acer
macrophyllum)
12 30 Declining Remove Decay at
parent branch
connection.
Will school
walkway when
tree fails.
2022 Big leaf Maple
(Acer
macrophyllum)
50 50 Dead Kretzchmaria
duesta (aggressive
root and trunk
decay organism)
Remove 7 trunks. Will
impact parling
lot when tree
fails.
1926 Black
cottonwood
(Populus
trichocarpa)
75 100 Dead Three trunks Remove Two trunks at
grade. Will
impact parling
lot when tree
fails.
1994 Big leaf Maple
(Acer
macrophyllum)
10 35 Dead Remove Will impact
parling lot
when tree fails.
1687 Big leaf Maple
(Acer
macrophyllum)
13 50 Declining Kretzchmaria
duesta, Ganoderma
sp. (aggressive root
and trunk decay
organisms)
Remove or
reduce to
wildlife snag, if
safe to climb
Previous
failure.
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1808 Red alder (Alnus
rubra)
20 45 Dead Remove or
reduce to
wildlife snag, if
safe to climb
2 trunks. Will
impact parling
lot when tree
fails.
1856 Red alder (Alnus
rubra)
14 40 Dead Remove or
reduce to
wildlife snag, if
safe to climb
Will impact
nature trail
frequented by
school children
when tree fails
1853 Red alder (Alnus
rubra)
14 40 Dead Remove or
reduce to
wildlife snag, if
safe to climb
Will impact
nature trail
frequented by
school children
when tree fails
1814 Red alder (Alnus
rubra)
10 40 Dead Remove or
reduce to
wildlife snag, if
safe to climb
Will impact
nature trail
frequented by
school children
when tree fails
1684 Big leaf Maple
(Acer
macrophyllum)
26 40 Dead Pruning:
remove dead
10” trunk
Will impact
nature trail
frequented by
school children
when tree fails
1776 Big leaf Maple
(Acer
macrophyllum)
55 60 Dead Sooty bark disease
(can cause
respiratory
infection in
humans)
Remove or
reduce to
wildlife snag, if
safe to climb
5 trunks. Will
impact nature
trail
frequented by
school children
when tree fails
1775 Big leaf Maple
(Acer
macrophyllum)
10 40 Dead Remove or
reduce to
wildlife snag, if
safe to climb
Will impact
nature trail
frequented by
school children
when tree fails
1774 Big leaf Maple
(Acer
macrophyllum)
12 40 Dead Remove or
reduce to
wildlife snag, if
safe to climb
Will impact
nature trail
frequented by
school children
when tree fails
1755 Big leaf Maple
(Acer
macrophyllum)
24 40 Declining Kretzchmaria
duesta (aggressive
root and trunk
decay organism)
Remove or
reduce to
wildlife snag, if
safe to climb
Two trunks.
Very decayed.
Will impact
nature trail
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Exhibit Map
The subject property. The approximate property line is indicated with red lines. The approximate locations of trees are designated
with red X’s for those to be removed and green leaves for those to be pruned. Photo from King County Parcel Viewer, 2019. North is
up.
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Developed southern half of the property
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Undeveloped northern half of the property.
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Photographic Evidence
Tree 1888 with the to be removed dead branch encircled in red.
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R i p p e y A r b o r i c u l t u r e L L C
C H I L D T r e e I n v e n t o r y
J a n u a r y 5 th, 2 0 2 1
P a g e | 10
Tree 1869 with the to be remove dead branch over the zipline identified by red arrows.
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D
R i p p e y A r b o r i c u l t u r e L L C
C H I L D T r e e I n v e n t o r y
J a n u a r y 5 th, 2 0 2 1
P a g e | 11
Tree 1889 with the to be removed eastmost trunk and its hollow cavity.
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D
R i p p e y A r b o r i c u l t u r e L L C
C H I L D T r e e I n v e n t o r y
J a n u a r y 5 th, 2 0 2 1
P a g e | 12
Tree 1889 with the to be removed dead trunk.
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D
R i p p e y A r b o r i c u l t u r e L L C
C H I L D T r e e I n v e n t o r y
J a n u a r y 5 th, 2 0 2 1
P a g e | 13
.
Tree 1889: Two westernmost to be removed trunks are identified by red X’s. Dead canopy of those trunks is encircled in red.
Red arrows indicate to be removed dead branches.
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D
R i p p e y A r b o r i c u l t u r e L L C
C H I L D T r e e I n v e n t o r y
J a n u a r y 5 th, 2 0 2 1
P a g e | 14
Tree 2495 with the decay at that connection of the two parent branches encircled in red. Decay on easternmost parent branch is
identified with a red arrow.
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D
R i p p e y A r b o r i c u l t u r e L L C
C H I L D T r e e I n v e n t o r y
J a n u a r y 5 th, 2 0 2 1
P a g e | 15
Tree 2022 is dead and will impact the parking lot when it fails.
DocuSign Envelope ID: 01558200-57B2-43A3-A921-8D55CAD4F14D