HomeMy WebLinkAboutTR_Arborist_Report_Echo_Mountain_Complete_290921_v3 1
ARBORIST REPORT
for
- Echo Mountain Apartments -
Avenue 5 Residential
Parcel: 3376750000
2223 Benson Rd S, Renton, WA 98055
Friday, June 18th, 2021
Site plan on final page of report
By Izzy Nosan | ISA Certified Arborist WE-11653A | izzy@aplustree.com
3490 Buskirk Ave., Pleasant Hill, CA 94523 | (206) 550-6679 | www.aplustree.com
2
Background
Information
This report was prepared on behalf of Echo Mountain Apartments concerning a
tree risk assessment of all trees located in the western greenbelt of the
property, located at 2223 Benson Road S, Renton, WA 98055.
11 trees are included on this report. These trees are all located within the
western greenbelt of the property and do not include the trees in the interior of
the property.
The trees included on this report are:
4 red alders
1 paper birch
5 big leaf maples
1 Western cottonwood.
The trees are located sporadically throughout the western greenbelt and are of
differing states of risk to the community and the westerly neighbors.
The tree risk assessment was performed on August 20th, 2020.
The tree risk assessment was regarding the present condition, tree integrity,
and future expectations of the trees. The trees were assessed with specific
focus on the potential risk to the westerly neighbors and the Echo Mountain
community.
The trees on this report were viewed as being high risk, given nearby targets,
site history, species characteristics, and occupancy rates, and have been
recommended for either removal or wildlife snag reduction.
The tree are within close proximity to critical target areas such as single family
home and the Echo Mountain community roads and parking areas.
Report continues on following page
3
Assignment (and
any limiting factors)
The assignment was a visual assessment in regard to health, condition,
structural integrity, threat of pest/disease and potential hazards.
This visual assessment was performed solely from ground grade and was
completed to provide recommendations for future action.
A Plus was requested to assess all trees within the interior of Echo Mountain
community (excluding the greenbelt areas to the east an west) and provide a
report regarding recommendations for safety concerns and potential impact to
the property, and to distinguish if the trees pose future risks. Echo Mountain
management intends to reduce the risk of future tree failures and/or structural
damage on site by acquiring arborist services for mitigation of high risk trees.
Echo Mountain management intends to plant replacement trees according
to the City of Renton regulations for tree retentions standards following
mitigatory tree care.
The only limiting factor was an excessive amount of blackberry brambles
inhibiting complete views of tree bases.
Report continues on following page
4
Observations At the time of the assessment, the following was observed:
(Please refer to the associated photos in the Attachments at the end of report.)
1)1 10” DBH red alder, Alnus rubra •Approximate height: 60 feet •A Plus Tree ID# 1000805758
a.This tree is dead.
b.Several apartment homes and a walking path are within the
drip line of the tree.
c.If retained, the tree is expected to either suffer whole tree
failure from the roots, future trunk failure, and/or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact an apartment or pedestrian, moderate to severe
consequences would be expected.
d.This tree should be reduced to a 15 foot tall widlife snag.
2)1 8” DBH paper birch, Betula papyrifera
•Approximate height: 25 feet •A Plus Tree ID# 1001103889
a.This tree is dead.
b.A main community road for Echo Mountain is within the drip
line of the tree.
c.If retained, the tree is expected to suffer future trunk failure,
and/or other individual large tree part failures in a heavy
loading event or under normal circumstances. Large-diameter
pieces are found within the canopy. If any of these tree parts
were to fail and contact a vehicle on the road or a pedestrian,
moderate consequences would be expected.
d.This tree should be removed.
3)1 multi-stemmed (each leader approximately 18” DBH), big leaf
maple, Acer macrophyllum
•Approximate height: 70 feet •A Plus Tree ID# 1001103890
a.This codominant tree has extensive amounts of decay in all
leaders.
b.The tree has very poor structure with significant amounts of
included bark between leaders.
c.A decay-caused cavity exists between all leaders.
d.There is extreme weight in the top of the tree.
e.Several parking areas and a main community road are within
the drip line of the tree.
f.If retained, the tree is expected to suffer individual large tree
part failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact a
vehicle or driver, moderate to severe consequences would be
expected.
g.This tree should be reduced to a 15 foot tall wildlife snag.
Report continues on following page
5
4)1 14” DBH Western cottonwood, Populus trichocarpa •Approximate height: 65 feet •A Plus Tree ID# 1001103892
a.This tree has sparse foliage, poor structure, and is growing at a
lean over the nearby home. Given site history and species
characteristics, it is expected to fail and contact the home.
b.A single-family home is within the drip line of the tree.
c.If retained, the tree is expected to suffer trunk failure or
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact the home, signifiant consequences would be
expected.
d.This tree should be reduced to a 15 foot wildlife snag.
5)1 10” DBH big leaf maple, Acer macrophyllum
•Approximate height: 35 feet •A Plus Tree ID# 1001103893
a.This tree is growing at a significant lean over the fence into the
neighboring home’s property. The tree is expected to fail and
contact the neighboring property.
b.A recreational backyard space is within the drip line of the tree,
and the home is within 1 X Height of the tree.
c.If retained, the tree is expected to suffer either whole tree
failure or a trunk failure in a heavy loading event or under
normal circumstances. Large-diameter pieces are found within
the canopy. If any of these tree parts were to fail and contact
the back yard or home, mild to moderate consequences would
be expected.
d.This tree should be removed.
6)1 multi-stemmed, approximately 30” DBH, big leaf maple, Acer
macrophyllum
•Approximate height: 75 feet •A Plus Tree ID# 1001103894
a.This codominant tree has extensive amounts of decay in all
leaders and is dying from the top, down.
b.The tree has very poor structure with significant amounts of
included bark between leaders.
c.Several decay-caused cavity exists on the trunks.
d.There is extreme weight in the top of the tree
e.Several parking areas and a main community road are within 1
X Height of the tree.
f.If retained, the tree is expected to suffer either trunk failures
and/or other individual large tree part failures in a heavy
loading event or under normal circumstances. Large-diameter
pieces are found within the canopy. If any of these tree parts
were to fail and contact a vehicle or driver, Significant to severe
consequences would be expected.
g.This tree should be reduced to a 15 foot tall wildlife snag.
Report continues on following page
6
7)1 multi-stemmed, approximately 30” DBH, big leaf maple, Acer
macrophyllum
•Approximate height: 60 feet •A Plus Tree ID# 1001103896
a.This codominant tree has extensive amounts of decay in all
leaders.
b.The tree has very poor structure with significant amounts of
included bark between leaders.
c.Decay-caused cavities exist in several spaces on the tree,
along with sunken in portions of stem.
d.There is extreme weight in the top of the tree.
e.There is a history of large diameter failures on this tree.
f.A neighboring single family home is within 1XHeight of the tree.
g.If retained, the tree is expected to suffer trunk failures or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact the neighboring home or resident, significant to severe
consequences would be expected.
h.This tree should be reduced to a 15 foot tall wildlife snag.
8)1 approximately 30” DBH, big leaf maple, Acer macrophyllum
•Approximate height: 60 feet •A Plus Tree ID# 1001103897
a.This tree has extensive amounts of decay in all leaders.
b.The tree has very poor structure.
c.Very large decay-caused cavities exist on the trunk.
d.There is extreme weight in the top of the tree.
e.There is a site history of large diameter maple failures.
f.A neighboring single family home is within 1XHeight of the tree.
g.If retained, the tree is expected to suffer trunk failures or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact the neighboring home or resident, significant to severe
consequences would be expected.
h.This tree should be reduced to a 15 foot tall wildlife snag.
9)1 8” DBH red alder, Alnus rubra
•Approximate height: 35 feet •A Plus Tree ID# 1001103899
a.This tree is dead.
b.Several apartment homes and a walking path are within the
drip line of the tree.
c.If retained, the tree is expected to either suffer whole tree
failure from the roots, future trunk failure, and/or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact an apartment or pedestrian, moderate to severe
consequences would be expected.
d.This tree should be removed.
Report continues on following page
7
10)1 7” DBH red alder, Alnus rubra
•Approximate height: 30 feet •A Plus Tree ID# 1001103900
a.This tree is dead.
b.Several apartment homes and a walking path are within the
drip line of the tree.
c.If retained, the tree is expected to either suffer whole tree
failure from the roots, future trunk failure, and/or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact an apartment, moderate to significant consequences
would be expected.
d.This tree should be removed.
11)1 9” DBH red alder, Alnus rubra
•Approximate height: 35 feet •A Plus Tree ID# 1001103901
a.This tree is dead.
b.Several apartment homes are within the drip line of the tree.
c.If retained, the tree is expected to either suffer whole tree
failure from the roots, future trunk failure, and/or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact an apartment, moderate to significant consequences
would be expected.
d.This tree should be removed.
Report continues on following page
8
Testing / Analysis No soil assessment or advanced testing procedures were conducted.
Discussion The trees included on this report are all expected to suffer failures if retained,
dependent on their individual defects and conditions. They ultimately pose a
risk to the residential setting in which they are located due to multiple high-risk
target areas.
Upon visual inspection of the trees discussed in this report, several structural
defects and conditions that increase the likelihood of failure and reduce the
trees’ structural integrity were observed. The trees were viewed as high risk
and likely to fail under normal conditions or a heavy loading event.
Given the associated targets, occupancy rates, and severe consequences
upon failure, the trees presented on this report were ranked as being high-risk
to the Echo Mountain apartment community and their westerly single-family
home neighbors. Given the poor conditions and high-risk of the trees, they
have exhausted their usefulness as landscape trees and have become
liabilities; expected to fail towards critical target areas with occasional to
constant occupancy. Future failures are expected to occur in a heavy-loading
event, or under normal conditions, if these trees are retained as-is. Given that
the associated targets are either within the drip line or 1 X Height of the trees,
they are expected to cause future property or personal damage if retained.
Echo Mountain management intends to plant replacement trees according
to the City of Renton’s standard, following mitigatory tree care.
Report continues on following page
9
Recommendations Following the site visit to Echo Mountain apartments, and the assessment of
the trees included on this report, the following is recommended:
Where possible, reduction to wildlife snags of approximately 15-20 feet will
be completed instead of complete removal in order to retain the natural benefit
of standing decaying wood for cavity-dwelling species of wildlife.
Complete removal will only be performed in instances where trees are unsafe
or unable to be climbed.
All debris is being recommended to be retained within the greenbelt area in
order to replicate the natural decomposition processes of the surrounding
environment.
•Replacement trees should be replanted in site and climate appropriate
spaces with adequate access to critical resources, and in accordance to the
City of Renton’s tree code regulations.
•Acceptable species would be: Douglas-fir, Western redcedar, Western
hemlock, big leaf maple, Western white pine, Lodgepole pine.
Alternative mitigation options were considered, but reduction to wildlife snags
and removal was deemed the preferred recommendation out of practicality and
to minimize residual risk.
Photos On Following Pages
10
Attachments:
Photo 1a:
ArborPlus inventory
data:
Tree ID:
1000805758
Dead red alder.
Report continues on following page
11
Photo 2a:
ArborPlus inventory
data:
Tree ID:
1001103889
Dead paper birch. Report continues on following page
12
Photo 3a:
ArborPlus inventory
data:
Tree ID:
1001103890
Big leaf maple with
extreme decay, poor
structure, and
cavities. Report continues on following page
13
Photo 3b:
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14
Photo 3c:
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15
Photo 3d:
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Photo 3e:
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Photo 4a:
ArborPlus inventory
data:
Tree ID:
1001103892
Leaning, poorly
structured
cottonwood leaning
over home.
Report continues on following page
18
Photo 5a:
ArborPlus inventory
data:
Tree ID:
1001103893
Big leaf maple
leaning heavily over
neighbors property.
Report continues on following page
19
Photo 5b:
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20
Photo 6a:
ArborPlus inventory
data:
Tree ID:
1001103894
Big leaf maple with
extreme decay, poor
structure, and
cavities.
Report continues on following page
21
Photo 6b:
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22
Photo 6c:
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23
Photo 7a:
ArborPlus inventory
data:
Tree ID:
1001103896
Big leaf maple with
extreme decay, poor
structure, and
cavities.
Report continues on following page
24
Photo 7b:
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25
Photo 7c:
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26
Photo 8a:
ArborPlus inventory
data:
Tree ID:
1001103897
Big leaf maple with
extreme decay, poor
structure, and
cavities.
Report continues on following page
27
Photo 8b:
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28
Photo 8c:
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29
Photo 9a:
ArborPlus inventory
data:
Tree ID:
1001103899
Dead red alder.
Report continues on following page
30
Photo 10a:
ArborPlus inventory
data:
Tree ID:
1001103900
Dead red alder.
Report continues on following page
31
Photo 11a:
ArborPlus inventory
data:
Tree ID:
1001103901
Dead red alder.
Report continues on following page
1
ARBORIST REPORT
for
- Echo Mountain Apartments -
Avenue 5 Residential
Parcel: 3376750000
2223 Benson Rd S, Renton, WA 98055
Friday, June 18th, 2021
Site plan on final page of report
By Izzy Nosan | ISA Certified Arborist WE-11653A | izzy@aplustree.com
3490 Buskirk Ave., Pleasant Hill, CA 94523 | (206) 550-6679 | www.aplustree.com
2
Background
Information
This report was prepared on behalf of Echo Mountain Apartments concerning a
tree risk assessment of all trees in the interior of the property, located at 2223
Benson Road S, Renton, WA 98055.
9 trees are included on this report. These trees are all located within the interior
of the property and do not include the trees in the greenbelt areas to the east
and west of the property (also owned by the property).
The trees included on this report are:
2 Austrian pines
1 Western cottonwood
4 paper birches
1 red alder
1 purple leaf plum
The trees are located sporadically around the community and are of differing
states of risk to the community.
The tree risk assessment was performed on May 17th, 2021.
The tree risk assessment was regarding the present condition, tree integrity,
and future expectations of the trees. The trees were assessed with specific
focus on the potential risk to the property, residents, and visitors.
The trees on this report were viewed as being high risk, given nearby targets,
site history, species characteristics, and occupancy rates, and have been
recommended for removal.
The tree are within close proximity to critical target areas such as apartment
homes, community roads, parking areas, and recreational space.
Assignment (and
any limiting factors)
The assignment was a visual assessment in regard to health, condition,
structural integrity, threat of pest/disease and potential hazards.
This visual assessment was performed solely from ground grade and was
completed to provide recommendations for future action.
A Plus was requested to assess all trees within the interior of Echo Mountain
community (excluding the greenbelt areas to the east an west) and provide a
report regarding recommendations for safety concerns and potential impact to
the property, and to distinguish if the trees pose future risks. Echo Mountain
management intends to reduce the risk of future tree failures and/or structural
damage on site by acquiring arborist services for mitigation of high risk trees.
Echo Mountain management intends to plant replacement trees according
to the City of Renton regulations for tree retentions standards following
mitigatory tree care.
No limiting factors were encountered during this assessment.
Report continues on following page
3
Observations At the time of the assessment, the following was observed:
(Please refer to the associated photos in the Attachments at the end of report.)
1)1 14” DBH Austrian pine, Pinus nigra •Approximate height: 70 feet •A Plus Tree ID# 1000805738
a.This tree is dead.
b.A pet area and several apartment homes are within the drip
line of the tree, and a community road and parking spaces are
within 1 X Height of the tree.
c.If retained, the tree is expected to either suffer whole tree
failure from the roots, future trunk failure, and/or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact an apartment, pedestrian or other vehicles, moderate
to severe consequences would be expected.
2)1 18” DBH Western cottonwood, Populus trichocarpa
•Approximate height: 75 feet •A Plus Tree ID# 1001333586
a.This tree is leaning heavily over critical target areas and
expected to fail.
b.Several apartment homes and parking spaces and a
recreational grassy area are within the drip line of the tree, and
a community road and parking spaces are within 1.5 X Height
of the tree.
c.If retained, the tree is expected to either suffer whole tree
failure from the roots, future trunk failure, and/or other
individual large tree part failures in a heavy loading event or
under normal circumstances. Large-diameter pieces are found
within the canopy. If any of these tree parts were to fail and
contact an apartment, pedestrian or other vehicles, moderate
to severe consequences would be expected.
3)1 10.5” DBH paper birch, Betula papyrifera
•Approximate height: 35 feet •A Plus Tree ID# 965500
a.This tree is mostly dead.
b.Several apartment homes are within the drip line of the tree.
c.If retained, the tree is expected to suffer individual large tree
part failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact an
apartment or pedestrian, mild to signifiant consequences
would be expected.
Report continues on following page
4
4)1 8.5” DBH paper birch, Betula papyrifera •Approximate height: 35 feet •A Plus Tree ID# 966223
a.This tree is mostly dead.
b.Several apartment homes, the community road, and a walking
area are within the drip line of the tree.
c.If retained, the tree is expected to suffer individual large tree
part failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact an
apartment or pedestrian, mild to signifiant consequences
would be expected.
5)1 7” DBH paper birch, Betula papyrifera
•Approximate height: 25 feet •A Plus Tree ID# 1001025966
a.This tree is mostly dead.
b.A recreational area is within the drip line of the tree.
c.If retained, the tree is expected to suffer individual large tree
part failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact a
pedestrian, mild to moderate consequences would be
expected.
6)1 12.5” DBH paper birch, Betula papyrifera
•Approximate height: 35 feet •A Plus Tree ID# 1001025972
a.This tree is mostly dead.
b.Several apartment homes, a sidewalk, and parking areas are
within the drip line of the tree.
c.If retained, the tree is expected to suffer individual large tree
part failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact an
apartment, vehicle or pedestrian, mild to signifiant
consequences would be expected.
Report continues on following page
5
7)1 10” DBH red alder, Alnus rubra •Approximate height: 35 feet •A Plus Tree ID# 1001333707
a.This tree is dead.
b.Several apartment homes are within the drip line of the tree.
c.If retained, the tree is expected to suffer either whole tree
failure from the roots, trunk failure, or individual large tree part
failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact an
apartment, mild to signifiant consequences would be
expected.
8)1 13” DBH Austrian pine, Pinus nigra
•Approximate height: 40 feet •A Plus Tree ID# 967518
a.This tree is dead.
b.A walking area and several apartment homes are within the
drip line of the tree.
c.If retained, the tree is expected to suffer either whole tree
failure from the roots, trunk failure, or individual large tree part
failures in a heavy loading event or under normal
circumstances. Large-diameter pieces are found within the
canopy. If any of these tree parts were to fail and contact an
apartment or pedestrian, mild to signifiant consequences
would be expected.
9)1 8” DBH purple leaf plum, Prunus cerasifera
•Approximate height: 35 feet •A Plus Tree ID# 968415
a.This tree has significant trunk decay.
b.Several apartment homes, a sidewalk, and community road are
within the drip line of the tree.
c.If retained, the tree is expected to suffer trunk failure in a heavy
loading event or under normal circumstances. Large-diameter
pieces are found within the canopy. If any of these tree parts
were to fail and contact an apartment, vehicle or pedestrian,
mild to signifiant consequences would be expected.
Report continues on following page
6
Testing / Analysis No soil assessment or advanced testing procedures were conducted.
Discussion The trees included on this report are all expected to suffer failures if retained,
dependent on their individual defects and conditions. They ultimately pose a
risk to the residential setting in which they are located due to multiple high-risk
target areas.
Upon visual inspection of the trees discussed in this report, several structural
defects and conditions that increase the likelihood of failure and reduce the
trees’ structural integrity were observed. The trees were viewed as high risk
and likely to fail under normal conditions or a heavy loading event.
Given the associated targets, occupancy rates, and severe consequences
upon failure, the trees presented on this report were ranked as being high-risk
to the Echo Mountain apartment community and visitors. Given the poor
conditions and high-risk of the trees, they have exhausted their usefulness as
landscape trees and have become liabilities; expected to fail towards critical
target areas with occasional to constant occupancy. Future failures are
expected to occur in a heavy-loading event, or under normal conditions, if
these trees are retained as-is. Given that the associated targets are either
within the drip line or 1 X Height of the trees, they are expected to cause future
property or personal damage if retained.
Echo Mountain management intends to plant replacement trees according
to the City of Renton’s standard, following mitigatory tree care.
Recommendations Following the site visit to Echo Mountain apartments, and the assessment of
the trees included on this report, the following is recommended:
All trees on this report are recommended to be removed to the ground and
stump ground.
•Replacement trees should be replanted in site and climate appropriate
spaces with adequate access to critical resources, and in accordance to the
City of Renton’s tree code regulations.
•Acceptable species would be: columnar zelkova, Ginko biloba, river birch,
Alaskan cedar, Pacific dogwood, Pacific crabapple.
Alternative mitigation options were considered, but removal was deemed the
preferred recommendation out of practicality and to minimize residual risk.
Photos On Following Pages
7
Attachments:
Photo 1a:
ArborPlus inventory
data:
Tree ID:
1000805738
Dead Austrian pine
Report continues on following page
8
Photo 2a:
ArborPlus inventory
data:
Tree ID:
1001333586
Western cottonwood
with significant lean
over building and
parking area.
Expected trunk
failure.
Report continues on following page
9
Photo 3a:
ArborPlus inventory
data:
Tree ID: 965500
Mostly dead birch.
Report continues on following page
10
Photo 3b:
11
Photo 4a:
ArborPlus inventory
data:
Tree ID: 966223
Mostly dead birch.
12
Photo 5a:
ArborPlus inventory
data:
Tree ID:
1001025966
Mostly dead birch. Report continues on following page
13
Photo 6a:
ArborPlus inventory
data:
Tree ID:
1001025972
Mostly dead birch.
Report continues on following page
14
Photo 7a:
ArborPlus inventory
data:
Tree ID:
1001333707
Dead alder.
Report continues on following page
15
Photo 8a:
ArborPlus inventory
data:
Tree ID:
1001333707
Dead Austrian pine
Report continues on following page
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Photo 9a:
ArborPlus inventory
data:
Tree ID: 968415
Purple leaf plum with
severe trunk decay
Report continues on following page
17
Photo 9b:
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