Arborist Report ARBORIST REPORT
CITY OF TIGARD LIBRARY
13360 SW Hall Boulevard
13560 SW Hall Boulevard
Tigard, Oregon 97223
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1
Matt Stine
City Forester
September 13, 2001
TREE PLAN FOR THE TIGARD CITY LIBRARY
13360 SW Hall Boulevard
13560 SW Hall Boulevard
Tigard, Oregon 97223
This Arborist Report is provided at the request of John Roy, Tigard City's Property
Manager as part of the proposed construction of a new library and parking lot.
The tree plan is based on property lines shown on the city of Tigard's MAGIC GIS
mapping program. The fieldwork was performed by Tigard City Forester, Matt Stine,
ISA Certified Arborist MA-3221. The fieldwork was conducted on September 11, 2001,
and all data are based on the conditions of the property on that date.
A total of 42 trees over 12" at Diameter Breast Height (DBH) were measured and
evaluated on both properties. The evaluation, however, was conducted in two parts based
on the street addresses. The first address, 13360 SW Hall Blvd., has a total of 11 trees
that were over 12" DBH. The second address, 13560 SW Hall Blvd., has a total of 31
trees over 12" DBH.
The condition of each tree was categorized as `Good', `Fair' or `Poor' based on the
following descriptions:
• GOOD -A full and balanced crown.
-Foliage has normal color and size for the species.
-No cavity, decay, cracks or splits in the main stem.
-Very few dead twigs.
• FAIR -The tree has some dead branches less than one inch in
diameter.
-The tree canopy is at least 3/4 full and somewhat
unbalanced.
-The leaves are showing overall good color but there are
some branches with discolored leaves.
-The trunk of the tree has minor problems such as missing
bark, or large old wounds.
-Overall, the tree looks good but seems stressed or injured.
• POOR -The tree has numerous dead branches larger than one inch
diameter.
-The canopy is not full with large areas of dead wood; less
than half of a full canopy.
-The leaves are showing signs of stress such as poor color
or size for the species.
-The trunk has wounds that have not closed. Presence of
cavities, rot, splits, or cracks in the trunk area.
-Overall, the tree looks unhealthy and probably would not
respond to any therapeutic care.
-The tree will have to be removed soon or within the next
few years.
TREE PROTECTION GUIDELINES
18.745.030
E. PROTECTION OF EXISTING VEGETATION. Existing vegetation
on a site shall be protected as much as possible:
1. The developer shall provide methods for the
protection of existing vegetation to remain during
the construction process; and
2. The plants to be saved shall be noted on the landscape
plans (e.g., areas not to be disturbed can be fenced, as in
snow fencing which can be placed around the individual
trees).
1.1. All tree protection devices shall be located on the Tree Protection Plan.
Any tree that will not be removed onsite that is within the limits of
disturbance of this project must be protected. Any tree that is located on
property adjacent to the construction project that will have more than 20%
of its root system disturbed by construction activities shall also be
protected.
1.2. Details and specifications are required as to how the trees will be protected
on site. The details and specifications are included in this memo.
1.3. Provide a construction sequence including installation and removal of tree
protection devices, clearing, grading, or installation of sediment and
erosion control measures, and other activities that may be required to
implement the tree protection measures.
•
1.4. Include in the notes on the final set of plans that equipment, vehicles,
machinery, dumping or storage, or other construction activities,burial,
burning, or other disposal of construction materials must not be located
inside of any tree protection device or outside of the limits of disturbance
where trees are being protected. No grading, filling or any other
construction activity may occur within the tree protection devices at any
time or outside of the limits of disturbance where trees are being protected
unless approved by the City Forester.
1.5. All tree protection devices shall be:
• Visible.
• Well-anchored.
• Approved in the field prior to clearing, grading, or the beginning of
construction.
■ Remain in place and maintained until all construction is completed and a final
inspection is conducted.
1.6. All tree protection devises shall be constructed according to the attached
illustrations (Figures D-5 and D-6).
1.7. To determine the size of the tree protection zone follow the guidelines
listed below:
• For individual trees follow the trunk diameter method. For
every one-inch of diameter at breast height (DBH), or 4 %2 feet
above the ground, allow 9 inches of space from the trunk of the
tree. For example, a tree that is 15" at DBH must have at least
12' of tree protection zone around the entire canopy of the tree.
• For groups of trees the tree protection zone must be outside of
the dripline of the trees on the edge of the stand. If there are
conifers with narrow crowns on the edge of the stand follow
the trunk diameter method or the dripline method, whichever is
greater.
1.8. Identify, on the Tree Protection Plan, the location of the stockpile area and
the staging area(if different from the stockpile area).
1.9. All of this information must be included in the final Tree Protection Plan's
notes or drawings.
TREE INVENTORY
13360 SW Hall Boulevard
1. Atlas cedar(Cedrus atlantica)
42.1" DBH
CONDITION: Fair. Although the tree appears healthy the main trunk is riddled with
sapsucker damage. Numerous bands of holes are present from approximately three
feet from the ground and extend up to thirty feet. The damage caused by the
sapsuckers can, over a long period of time, have detrimental effects to the tree. This
cedar tree is not showing signs of decline or failure. Other than the damage caused
by sapsuckers the tree is healthy.
2. English walnut(Juglans regia)
20"DBH
CONDITION: Good. This tree is growing well at this site although it has had
substantial directional pruning. It is growing underneath utility wires so the power
companies have had to remove a large portion of the canopy. The tree has maintained
good balance and has established a normal canopy for a tree its size.
3. English walnut (Juglans regia)
16.8"DBH
CONDITION: Fair. My comments for this tree are the same as #2 above except for
the presence of a large wound in the lower portion of the main stem. At some point
this tree sustained a massive injury that has since compartmentalized. The injury was
so severe, though, that extensive rot has infected the main stem thus stressing the tree.
I feel that the tree will begin showing signs of decline within the next couple of years.
4. English walnut (Juglans regia)
18.4" DBH
CONDITION: Poor. The majority of this tree's canopy is dead. The tree will not
recover from any therapeutic treatments.
5. English walnut(Juglans regia)
18.3"DBH
CONDITION: Poor. .My comments for this tree are the same as #2 above except for
the presence of a cavity and rot in the main stem and primary crotch. The rot is
extensive enough to weaken certain limbs of the tree and cause them to fail. When
the limbs fail, enough of the canopy will be lost to kill the tree. Proper pruning can
be done to remove some of the weight from the limbs to temporarily lower the
chances of the limbs failing.
6. Atlas cedar(Cedrus atlantica)
32.6" DBH
CONDITION: Fair. The top of this tree broke out several years ago. Additionally,
numerous dead branches are throughout the remaining canopy. Sapsucker damage is
also present but not as extensive as in tree#1.
7. Giant sequoia(Sequoiadendron giganteum)
66.2"DBH
CONDITION: Fair. The top of this tree broke out several years ago. Currently the
tree is suffering from dieback on the tips of its branches. The fungus Botrosphaeria
dothidea causes the dieback. The fungus does not usually kill the host plant but, due
to the stress of the infection, the host is predisposed to further infestations and/or
pathogens.
8. Atlas cedar(Cedrus atlantica)
25.1 "DBH
CONDITION: Good.
9. Norway spruce (Picea abies)
21.2" DBH
CONDITION: Fair. Due to the severe lean(20°+) and moderate decay in the plane
of the lean this tree the condition is "Fair". I did not observe any ground heaving or
broken roots, which would indicate failure or likely failure of the entire tree.
Otherwise, the tree has all of the qualities of a healthy tree.
10. Norway spruce (Picea abies)
23.6" DBH
CONDITION: Good.
11. Norway spruce (Picea abies)
25.9" DBH
CONDITION: Good.
13560 SW Hall Boulevard
1. Pin oak (Quercus palustris)
15.5" DBH
CONDITION: Good. This tree will require pruning to meet the minimum clearance
requirements of eight feet.
2. Douglas fir(Pseudotsuga menziesii)
15.6" DBH
CONDITION: Good.
3. Douglas fir(Pseudotsuga menziesii)
12.2" DBH
CONDITION: Good
4. Douglas fir(Pseudotsuga menziesii)
12.0" DBH
CONDITION: Fair. This tree is forked at one foot above the ground. Although the
tree is in excellent condition in terms of health, the presence of included bark poses a
problem for the tree's long-term survival. Included bark is very common when trees
are forked or have narrow branch attachments. The problems arise when the tree
continues to grow laterally and the forks push against each other. The continuous
pressure of the lateral growth causes severe stress and wind is usually the catalyst for
one or both of the stems to fail.
5. Western red cedar(Thuja plicata)
12.3" DBH
CONDITION: Good. This tree is growing in a grove with various tree species.
Since western red cedars tend to grow slower than most other species of trees, it will
most likely be overtopped and become a part of the intermediate canopy. Western
red cedars oftentimes occur in the shade of faster growing trees so this tree being
overtopped should not be a matter of concern.
6. Hybrid poplar(Populus `Eugenii')
21.9"DBH
CONDITION: Fair. Since this variety of poplar tree grows so rapidly it has very
weak wood and branch attachments. Therefore, when the tree begins to decline, it
deteriorates rapidly and becomes quite hazardous. This tree has begun to show signs
of decline in that there are numerous large, dead limbs throughout the canopy.
7. Hybrid poplar(Populus `Eugenii')
14.7" DBH
CONDITION: Good. Watch for signs of decline.
8. Hybrid poplar(Populus `Eugenii')
20.9" DBH
CONDITION: Good. Watch for signs of decline.
9. Douglas fir(Pseudotsuga menziesii)
24.7" DBH
CONDITION: Good. Despite having lost the top 10' or so the tree is in good health.
10. Dove tree (Davidia involucrata)
24.2" DBH
CONDITION: Good. This tree is in a line of six Dove trees that are unique to this
area.
11. Dove tree (Davidia involucrata)
22.3"DBH
CONDITION: Good
12. Dove tree (Davidia involucrata)
26.3" DBH
CONDITION: Good
13. Dove tree (Davidia involucrata)
18.0" DBH
CONDITION: Good
14. Dove tree (Davidia involucrata)
26.8" DBH
CONDITION: Good
15. Dove tree (Davidia involucrata)
23.4"DBH
CONDITION: Good
16. Dove tree (Davidia involucrata)
42.0"DBH
CONDITION: Good
17. Hawthorn (Cral`aegus)
26.6"DBH
CONDITION: Good. This is multi-stem tree. Included bark is not yet
compromising the health of the tree. The forks do not have narrow attachments to the
main stem.
18. Norway maple (Acer platanoides)
21.5" DBH
CONDITION: Good.
19. Plum (Prunus)
21.0" DBH
CONDITION: Poor. The majority of this tree's canopy is dead. There is extensive
and widespread rot throughout the trunk, main lateral branches and root flares.
Fruiting bodies, which indicate advanced decay, are present on the main stem and
root flares.
20. English walnut (Juglans regia)
23.8"DBH
CONDITION: Good.
21. Norway maple (Acer platanoides)
22.5"DBH
CONDITION: Good.
22. Norway maple (Acer platanoides)
20.7" DBH
CONDITION: Good
23. Norway maple (Acer platanoides)
13.0" DBH
CONDITION: Good.
24. Ponderosa pine (Pinus ponderosa)
38.7" DBH
CONDITION: Good. The tree has a forked top, which could cause a problem as the
forks grow laterally. Included bark is present.
25. Horse chestnut (Aesculus hippocastanum)
18.0 DBH
CONDITION: Fair. The canopy is unbalanced which could cause the tree to fall
over. I did not observe any soil heaving or root failure.
26. Horse chestnut (Aesculus hippocastanum)
18.0 DBH
CONDITION: Fair.. The canopy is unbalanced which could cause the tree to fall
over. I did not observe any soil heaving or root failure. The canopy has areas of
sparse foliage.
27. Horse chestnut (Aesculus hippocastanum)
13.0 DBH
CONDITION: Good
28. Norway maple (Acer platanoides)
23.2"DBH
CONDITION: Good.
29. Norway maple (Acer platanoides)
29.4" DBH
CONDITION: Good
30. Norway maple (Acer platanoides)
35.2" DBH
CONDITION: Good
31. Dove tree (Davidia involucrata)
18.3"DBH
CONDITION: Good.
ANCHOR POSTS SHOULD BE — HIGHLY VISIBLE
MINIMUM 2"STEEL U CHANNEL FLAGGING ATTACHED TO TOPS
OR 2'X2"TIMBER,6'IN LENGTH OF ANCHOR POSTS
MAXIMUM 8 FEET USE 2"X4"LUMBER
FOR CROSS BRACING
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ANCHOR POSTS MUST BE
INSTALLED TO A DEPTH OF
NO LESS THAN 1/3 THE
TOTAL HEIGHT OF POST USE 8"WIRE'U'
TO SECURE FENCE
BOTTOM
Notes:
1. Blaze orange or blue plastic mesh fence for forest protection device,only.
2. Boundaries of Retention Area will be established as part of the forest conservation plan
review process.
3. Boundaries of Retention Area should be staked and flagged prior to installing device.
4.Avoid damage to critical root zone. Do not damage or sever large roots when Installing
posts.
5. Protection signs are required.
6. Device should be maintained throughout construction.
d
Source:Adapted from Prince George's County,Maryland:Woodland Conservation Manual and Forest Conservation
Manual, 1991
Plastic Mesh Tree Protection Fence Figure
D-5
D - 6
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ANCHOR POSTS SHOULD DE
\\\\ — HIGHLY YISIBLE
MINIMUM 2" STEEL U CHANNEL FLAGGING ATTACHED TO TOPS
OR 2"X2"T1M6EIZ,6IN LENGTH OF ANCHOR POSTS
U5E 2"X4"LUMBER
MAXIMUM 13 FEET FOR CR055 BRACING
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ANCHOR POSTS MUST BE
INSTALLED TO A DEPTH OF
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NO LESS THAN 1/3 THE
N.
TOTAL HEIGHT OF POST USE 8"WIRE'U'
TO SECURE FENCE
BOTTOM
Notes:
1. Blaze orange or blue plastic mesh fence for forest protection device,only.
2. Boundaries of Retention Area will be established as part of the forest conservation plan
review process.
3. Boundaries of Retention Area should be staked and flagged prior to installing device.
4.Avoid damage to critical root zone. Do not damage or sever large roots when installing
posts.
5. Protection signs are required.
6. Device should be maintained throughout construction.
•
. . .
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Source Adapted from Prince George's County Maryland:Woodard Conservation Manual and Forest Conservation
Manual,1091
Wire Tree Protection Fence Figure -
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Community Development