HomeMy WebLinkAboutTR_Arborist Report _200122_v2.pdfTitle: Boeing Apron E Expansion
Level 2 Basic Tree Risk Assessment
Renton, Washington
Prepared for: HBB Architects
Attn: Mr Aaron Luoma
215 Westlake Ave. North
Seattle, Washington 98109-5217
Prepared by: Urban Forestry Service, Inc.
Anna Heckman
ISA Board Certified Master Arborist® #PN-6153B,
ISA Tree Risk Assessment Qualified
Date: June 18, 2019
Contents
Summary
Introduction
Findings and Recommendations
Method of Assessment
Site Map with Trees Located
Tree Assessment Matrix
Tree Protection Guidelines
Critical Root Zone Explanation
Assumptions and Limiting Conditions
Summary
A Level 2 Basic Tree Risk Assessment was conducted on one hundred and three (103) trees
in and surrounding the Boeing Apron E Expansion Project in the S1 parking lot in Renton,
Washington. 26 trees are street trees and should be managed in conjunction with the city.
Seventy (70) of the seventy-seven (77) trees on the property are significant by size and fourteen
(14)significant trees are dead, dying, or diseased. This leaves fifty-six (56) significant trees to
be retained or removed and mitigated for as needed. Tree retention calculations show that five
trees require retention to meet the minimum tree retention standards. These trees should be
protected through construction.
Note:
This document contains the Arborist
Report for the Apron E Expansion and
also the Lot S2 Firestation project no
longer going forward. The Lot S2
assessment includes trees within the
current project construction area that
will be affected, see report below and
the Tree Retention Land Clearing
Exhibit.
Boeing Apron E Expansion, Tree Risk Assessment
Urban Forestry Services, Inc.
June 18, 2019 Page 2 of 6
Introduction
As requested by Aaron Luoma with HBB, I visited the Boeing S1 parking lot south of
North 6th St along Logan Ave N. in Renton Washington on May 23rd and 24th, 2019. The
purpose of this work was to map and assess the trees impacted by expansion of the airplane
construction apron.
Trees to be assessed are located in parking lot islands and in long planting strips along the
edge of the current parking lot. A public multiuse pedestrian trail on the east side of the parking
lot is located between a linear row of onsite retention trees and the City managed street trees
along Logan Ave. N. A second linear strip of street trees borders the north property line along
North 6th St.
Trees were numbered with aluminum tags beginning with #201 on the south west side of
the parking lot. Tags are nailed to the north side of the trunk at eye level. Trees are individually
identified on the attached Tree Site Plan with photo and data for each tree provided in the
attached Tree Assessment Matrix.
Tree retention and land clearing regulations for the city of Renton; municipal code 4-4-130
Tree Retention and Land Clearing Regulations, identify Significant trees as 6 inches diameter
and 8 inches for cottonwood or alder unless they are considered “dangerous”. Landmark trees
are over 30 inches. Priority tree retention requirements (section H1b.) should be implemented in
tree preservation selection on the site.
Findings and Recommendations:
Photo 1: Dead ‘Crimson King’ maple trees in the foreground on the west side of the parking lot and the
columnar ‘Armstrong’ maples in the distance are on the east side of the parking lot.
Boeing Apron E Expansion, Tree Risk Assessment
Urban Forestry Services, Inc.
June 18, 2019 Page 3 of 6
The fifty-five (55) trees in the interior parking lot islands have not been well maintained.
Soils are very dry and compacted, and no mulch or organic layer remains from the initial
planting. Many trees are in very poor condition and some are dead. Trees in larger planter strips
or grown in groups were in better condition than the individual planting areas. Trees less
tolerant to drought and heat such as the red maples (Acer rubrum) were in much poorer condition
than adjacent, more drought tolerant shore pines (Pinus contorta).
Multiple specimens have been structurally damaged beyond reasonable recovery. Some trees
have major structural defects due to not having the tree stakes and ties removed (Photo 2).
Others were not structurally pruned for balanced canopies when they were young. These trees
have or will have structural failures that will impact their longevity on the site.
The eastern side of the parking lot has many trees in good condition. These trees are the
highest value to retain on the site. Fourteen (14) of the twenty-two (22) trees along the eastern
edge of the parking lot can be retained as described in the 60% design. These Armstrong maples
(Acer X freemanii ‘Armstrong’) have Perimeter Critical Root Zones (PCRZ) identified in the
Tree Assessment Matrix. Trees chosen for retention should have the PCRZ drawn to scale on all
plans. Information on the PCRZ can be found in the attached Critical Root Zone explanation
sheet. Tree #265 has a split leader that will require significant cabling and pruning to retain
safely. This tree is recommended for removal for construction at this time.
Photo 2: Tree ties were not removed and have girdled the top of th ese trees. Though there is still living
canopy, decay through the trunk impacts their longevity.
Boeing Apron E Expansion, Tree Risk Assessment
Urban Forestry Services, Inc.
June 18, 2019 Page 4 of 6
Street trees were measured along Logan Ave and North 6th street. The eleven (11) American
ash (Fraxinus americana) along Logan Ave are healthy despite the 4 to 8 inches of soil volume
loss below the curb since they were planted. This soil volume loss will impact the long term
health and stability of these street trees. These trees look to be an American ash, ‘Autumn
Applause’ variety, based on early spring form and leaf structure. Fall color or paper
documentation of the cultivar is recommended for confirmation if matching these trees in the
new landscape is desired.
The fifteen (15) Leprechaun ash (Fraxinus pennsylvanica ‘Johnson’ PP 9136 Leprechaun™)
along North 6th street are not significant trees. These trees are young and were pruned shortly
after planting in 2014 resulting in tall skinny trunks that have poor structure. Many of these trees
are in poor health and may not survive construction impacts even with the best protection. The
healthier specimens could be successfully transplanted to other areas on the property. This
species is a unique and interesting small tree selection.
The recommendations provided balance the benefits of retaining trees on site with the
reasonable ability for those trees to survive construction and provide benefits to the new site.
Retention numbers are expected to change as site plans are altered. Example mitigation numbers
were calculated for discussion and planning purposes, final numbers for the project should be
calculated using the final retention and removal design.
Recommendations:
1. Remove 14 significant and 2 non-significant dead and dying trees on the property.
(#’s 201, 221, 230, 231, 235, 237, 238, 240, 241, 243, 245, 246, 249, 257, 261, 262)
These trees are either dead, unhealthy beyond recovery given reasonable efforts, or are
structurally damaged to a point where tree health has been compromised. Though small,
these trees fit the definition of “dangerous” due to physical and structural integrity in the
Renton tree code. These trees vary in health and structural deficiencies, but all are identified
in the attached map and matrix as having no retention value. The sixteen (16) significant
trees can be subtracted from the mitigation total in the mitigation calculation sheet.
2. Remove 41 significant and 5 non-significant trees for construction. (#’s202-208, 212,
219, 220, 222-229, 232-234, 236, 239, 242, 244, 247, 248, 250-256, 258-260, 263-269, 276,
277)
These trees are viable and will require replacement if removed for construction. This
calculation uses the 60% design for guidance. The number of trees retained or removed for
construction is expected to change as designs develop. Trees proposed for removal are
Priority 2 significant, non-native trees.
3. Retain and protect 14 of the Armstrong Maples. (#210, 211, 213-218, 270-275) and one
red maple (#209).
. These trees along the east side of the site should be protected prior to construction
following the attached Tree Protection Guidelines. Supplemental irrigation and wood chip
mulch should be installed to protect the soil and improve tree resilience prior to construction.
Boeing Apron E Expansion, Tree Risk Assessment
Urban Forestry Services, Inc.
June 18, 2019 Page 5 of 6
Tree #271 is a “Priority 1 non-native tree over 18” diameter”, the red maple is part of a grove
with tree # 210 and 211, and the remainder trees are “Priority 2 significant, non-native trees”.
These trees are in the highest retention categories identified on the site.
4. Retain, protect, and manage the 11 American ash Street trees (#278-288) and the 15
Leprechaun ash trees (#289-303) per direction of the City.
These trees are regulated and protected by the City of Renton. Tree health and retention
values vary and are identified on the attached map and matrix. These data provide
documentation of pre-construction condition in case of incident during or post construction.
Trees #287, 300, and 301 are identified for removal in the 60% design. These trees will
require City approval and mitigation in addition to the mitigation for the trees on the site per
City direction.
Conclusion:
Most of the trees on the site will be removed for construction. Based on the number of trees
on the site and the industrial zoning, only five (5) trees are required to be retained. This number
does not change even if no trees were designated as dying or “dangerous”. Protecting the
thirteen (13) Armstrong maples on the east side of the property satisfies the tree protection
requirements for this area. If plans change and less than 5 trees will be retained on the site, the
city will need to approve the mitigation option. This option will require at least 32 trees of 2-
inch caliper size to be planted on the site to meet mitigation requirements.
The street trees will require coordination with the City of Renton for protection requirements,
removal and replanting options. The American ash along Logan Ave. can be retained and
protected, the Leprechaun ash along North 6th are recommended to be relocated or replaced.
Method of Assessment
This Level 2 Basic Tree Risk Assessment was conducted according to the ISA Tree Risk
Assessment Qualification (TRAQ) training and methodology (see the attached Tree Risk
Assessment Level Descriptions). While no one can predict with absolute certainty which trees
will fail and which trees will remain healthy, by methodical process we can predict those most
likely to fail by the conditions observed and take appropriate action to reduce or eliminate the
potential hazard. The time frame for this Level 2 Basic Tree Risk Assessment considers
expected conditions and issues over the next year. Because tree conditions change over time,
further assessment may be necessary in the future.
Boeing Apron E Expansion, Tree Risk Assessment
Urban Forestry Services, Inc.
June 18, 2019 Page 6 of 6
Tree Risk Assessment Level Descriptions
The tree risk assessment process is based on factors present at the time of assessment. Because trees are
living, growing things that change in size and condition over time, the tree assessment process must also
recognize and anticipate where and when future assessments should be performed. The Tree Risk Assessment
Qualification (TRAQ) training and methodology, developed and administered by the International Society of
Arboriculture is the best available methodology for tree risk assessment at this time. There are three levels of
assessment that may be considered and employed according to the expectations of the owner or manager,
conditions of the site and of the trees involved:
Level 1 Limited Visual Assessment: Includes a broad overview of an individual tree or group of trees near
specified targets, conducted to identify obvious defects or other conditions of concern. A limited visual
assessment typically focuses on identifying trees with imminent and/or probable likelihood of failure. Level 1
assessments do not always meet the criteria for a "risk assessment" if they do not include documented analysis
and evaluation of individual trees. This level is typically used for large populations of trees as a means to
quickly identify trees with imminent and/or probable likelihood of failure, at a specified schedule and/or
immediately after storms.
Level 1 assessments may be done as walk-by, drive-by or aerial patrols as requested by the tree owner or
manager. They may not provide enough information to develop risk mitigation recommendations. They can
help identify specific areas and/or trees for further inspection at Level 2 or 3. Trees found to require a Level 2
Basic Assessment are assessed, mapped and documented at the higher level at this time. Trees determined to
need a Level 3 Advanced Tree Assessment are documented and recommended for additional testing and
analysis. The owner is notified with options discussed.
Level 2 Basic Assessment: This is a detailed visual inspection of a tree and its surrounding site, and a synthesis
of the information collected. It requires that a tree risk assessor walk completely around the tree, looking at
the site, buttress roots, trunk, and branches. This basic assessment may include the use of simple tools to gain
additional information about the tree or defects. Our Level 2 Basic Assessment Trees are all typically tagged,
mapped and information gathered and retained for each tree. Risk mitigation recommendations may be
derived from this level of inspection. Defects found in a Level 2 Basic Tree Assessment may require a Level 3
assessment for further testing and analysis. The owner is notified with options discussed.
Level 3 Advanced Assessment: Advanced assessments are performed to provide more highly detailed
information about specific tree components, defects, targets or site conditions. An advanced assessment is
performed in conjunction with or after a Level 2 Basic Assessment if the assessor determines the need for
(requires) additional information. This level is particularly useful where there are concerns about trees that
may otherwise be of high value, or to obtain better information on how serious or extensive a particular defect
is. The Level 3 Advanced Tree assessment may include but not be limited to a root crown inspection with air
spade, Resistograph or Tomograph use to determine sound wood or an aerial crown inspection.
The preliminary Level 1 Limited Visual Assessment if requested would help determine where field
assessments at Level 2 and Level 3 will be needed.
Page 1 of 2
June 18, 2019
Boeing Apron E Expansion, Tree Inventory
Renton, Washington
URBAN FORESTRY SERVICES, INC.
15119 McLean Road
Mount Vernon, WA 98273
PRESERVATION VALUE SYMBOLS
SPECIAL, UNIQUE SPECIES, SPECIMEN OR
FORM. SAVE.
HIGH, GOOD QUALITY, CHARACTER TREE.
SAVE IF POSSIBLE.
MODERATE, COMMON SPECIES, FAIR CONDI-
TION. MAY NEED SPECIAL ATTENTION TO
PRESERVE.
LOW, POOR SPECIMEN OR SPECIES. HIGH
MAINTENANCE OR SOME CAUTION IF RE-
TAINED.
“DANGEROUS” - HAZARD OR DEAD , DIS-
EASED, OR NOT SIGNIFICANT. TREE IS DEAD
OR IN VERY POOR CONDITION ND SHOULD BE
REMOVED.
NON SIGNIFICANT TREE < 6” DIAMETER
SIGNIFICANT TREE > 6” DIAMETER
#281
#280
#279
#303
#298
#302
#299
#296
#297
#300
#294
#295
#301
#290
#291 #293 #289
#292
#278
#274
#275
#277
#282
#242
#248
#276
#273
#272
#252
#254
#253
#255
#256
#251
#258
#257
#263
#262
#261
#260
#259
#267
#268
#250
#266
#269
#271
#270
#249
#283
#247
#237
#246
#245
#236
#244
#241
#243
#238
#234
#235
####
####
Page 2 of 2
June 18, 2019
Boeing Apron E Expansion, Tree Inventory
Renton, Washington
URBAN FORESTRY SERVICES, INC.
15119 McLean Road
Mount Vernon, WA 98273
PRESERVATION VALUE SYMBOLS
SPECIAL, UNIQUE SPECIES, SPECIMEN OR
FORM. SAVE.
HIGH, GOOD QUALITY, CHARACTER TREE.
SAVE IF POSSIBLE.
MODERATE, COMMON SPECIES, FAIR CONDI-
TION. MAY NEED SPECIAL ATTENTION TO
PRESERVE.
LOW, POOR SPECIMEN OR SPECIES. HIGH
MAINTENANCE OR SOME CAUTION IF RE-
TAINED.
“DANGEROUS” - HAZARD OR DEAD , DIS-
EASED, OR NOT SIGNIFICANT. TREE IS DEAD
OR IN VERY POOR CONDITION ND SHOULD BE
REMOVED.
NON SIGNIFICANT TREE <6” DIAMETER
SIGNIFICANT TREE >6” DIEAMETER
#208
#203 #206
#207 #204
#202
#201 #205
#215
#211
#213
#210 #209
#222
#218
#217
#225
#216
#214
#212
#221
#220
#219
#230
#226
#224
#223
#228
#229
#231
#227
#232
#286
#284
#285
#263
#264
####
#287
#288
####
#283
#267
#262
#233
#268
#266
#265
#234
#235
#240
#239
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
201 Poor to Fair Poor to FairShore pine 12.3,
(12.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pinus contorta var.
contorta
CRZ (ft)
12.3
Tree has had unusual historical top loss resulting in unstable growth pattern with decay. Small branches are in decline. Recovery efforts may not be cost effective.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
202 Good Poor to FairShore pine 9.8,
(9.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Pinus contorta var.
contorta
CRZ (ft)
9.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
203 Fair to Good Fair to GoodRed maple 10.3,
9.2, 6.6,
6
(16.44)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
16.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
204 Fair to Good FairShore pine 7.8, 6.8
(10.35)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Pinus contorta var.
contorta
CRZ (ft)
10.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
1 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
205 Poor to Fair Poor to FairShore pine 9,
(9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Pinus contorta var.
contorta
CRZ (ft)
9.0
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
206 Poor to Fair FairShore pine 7.8,
(7.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Pinus contorta var.
contorta
CRZ (ft)
7.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
207 Poor to Fair FairRed maple 11,
(11)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
11.0
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
208 Poor to Fair FairRed maple 10.3,
(10.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
10.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
2 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
209 Fair FairRed maple 13.6,
(13.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
13.6
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
210 Fair to Good FairArmstrong maple 18.3,
(18.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
18.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
211 Fair Poor to FairArmstrong maple 9.8,
(9.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
9.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Root Prune
Recommendations
Tree
212 Fair Fair to GoodArmstrong maple 8.5,
(8.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
8.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
3 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
213 Fair FairArmstrong maple 6.8,
(6.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
6.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
214 Fair FairArmstrong maple 10.5,
(10.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
10.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
215 Fair FairArmstrong maple 12.3,
(12.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
12.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
216 Fair FairArmstrong maple 13.6,
(13.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
13.6
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
4 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
217 Fair FairArmstrong maple 12.2,
(12.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
12.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
218 Fair FairArmstrong maple 15.4,
(15.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
15.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
219 Fair FairCrimson King 7.9,
(7.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.9
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
220 Poor to Fair FairCrimson King 7.1,
(7.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.1
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
5 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
221 Dying/Dead Poor to FairRed maple 7.8,
(7.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
7.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
222 Fair FairShore pine 10.4,
(10.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Pinus contorta var.
contorta
CRZ (ft)
10.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
223 Fair FairCrimson King 7.2,
(7.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
224 Fair Poor to FairCrimson King 9.1,
(9.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
9.1
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
6 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
225 Poor Poor to FairRed maple 6, 6, 6,
4, 4, 4,
4, 2
(13.27)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
13.3
tree is a multi stem. Recovery efforts may not be cost effective.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
226 Poor FairRed maple 7.9,
(7.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
7.9
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
227 Fair FairLodgepole pine 15,
(15)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Pinus contorta var.
latifolia
CRZ (ft)
15.0
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
228 Poor Poor to FairRed maple 7.3,
(7.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
7.3
Tree is in severe decline. Recovery efforts, though possible may not be cost effective and have a low probability of success.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
7 Date:
6/19/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
229 Poor to Fair Poor to FairRed maple 7.3, 8.6,
8.8, 4, 4
(15.38)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
CRZ (ft)
15.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
230 Fair PoorCrimson King 6.2,
(6.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.2
Tree stake ties were not removed. Tree leader was girdled and failed opening the trunk to decay. This tree should be removed despite construction.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
231 Poor to Fair PoorCrimson King 5.5,
(5.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
5.5
Tree stake ties were not removed and are girdling the main stem on this tree. Remove tree.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
232 Fair FairCrimson King 5.5, 5, 2
(7.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.7
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
8 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
233 Poor to Fair FairCrimson King 8.7,
(8.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
8.7
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
234 Poor to Fair Poor to FairCrimson King 7.3,
(7.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
235 Dying/Dead Dying/DeadCrimson King 7.7,
(7.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.7
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
236 Fair FairCrimson King 5.9,
(5.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
5.9
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
9 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
237 Dying/Dead Dying/DeadCrimson King 7.3,
(7.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
238 Dying/Dead Dying/DeadCrimson King 9.1,
(9.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
9.1
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
239 Poor to Fair FairFlowering crab 3.1,
(3.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Malus species
CRZ (ft)
3.1
Not significant.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
240 Poor to Fair PoorLeyland cypress 11.4,
(11.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
× Cupressocyparis
leylandii
CRZ (ft)
11.4
Tree has trunk damage and significant die back.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
10 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
241 Poor PoorLeyland cypress 9.4,
(9.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
× Cupressocyparis
leylandii
CRZ (ft)
9.4
Tree has lost top and is dying back.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
242 Poor to Fair FairFlowering crab 4.8,
(4.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Malus species
CRZ (ft)
4.8
Not significant.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
243 Dying/Dead Dying/DeadCrimson King 6.4,
(6.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
244 Poor Poor to FairCrimson King 7.3,
(7.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.3
Multiple dead branches and top die back will be difficult to recover. Recovery efforts may not be cost effective.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
11 Date:
6/19/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
245 Dying/Dead Dying/DeadCrimson King 5.3,
(5.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
5.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
246 Dying/Dead Dying/DeadCrimson King 6.4,
(6.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
247 Fair Poor to FairCrimson King 9.8,
(9.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
9.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
248 Poor Poor to FairRed sunset red 3.4,
(3.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer rubrum
'Franksred'
CRZ (ft)
3.4
Not significantNotes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
12 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
250 Poor to Fair Poor to FairArmstrong maple 6.5,
(6.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
6.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
249 Poor to Fair PoorAutumn blaze 7.8,
(7.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Jeffersred'
CRZ (ft)
7.8
Trunk wound at the base has significant decay.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
251 Poor to Fair FairCrimson King 6.4,
(6.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
252 Fair FairCrimson King 8.1,
(8.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
8.1
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
13 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
253 Poor to Fair FairCrimson King 8.3,
(8.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
8.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
254 Poor to Fair FairCrimson King 6.9,
(6.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.9
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
255 Poor to Fair Poor to FairCrimson King 6.8,
(6.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
256 Poor to Fair FairCrimson King 6.4,
(6.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
14 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
257 Poor Poor to FairCrimson King 6.3,
(6.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.3
Top and crown has died back resulting in a very poor structure that may not be cost effective to recover.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
258 Fair Poor to FairCrimson King 7.5,
(7.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
259 Fair FairCrimson King 7.3,
(7.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
260 Poor to Fair FairCrimson King 6.5,
(6.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
15 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
261 Poor Poor to FairCrimson King 6,
(6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.0
Top die back and 50% crown loss. It may not be cost effective to try to recover.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
262 Poor PoorCrimson King 6.9,
(6.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.9
Top die back. Structural recovery may not be cost effective with this tree.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
263 Poor to Fair FairCrimson King 6.6,
(6.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
6.6
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Tree
264 Fair FairCrimson King 7.4,
(7.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer platanoides
'Crimson King'
CRZ (ft)
7.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
16 Date:
6/14/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
265 Good PoorRed sunset red 16.6,
(16.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Medium
Acer rubrum
'Franksred'
CRZ (ft)
16.6
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Monitor Tree, Risk of Failure
Cable/Brace
Subordinate Prune
Recommendations
Tree
266 Fair Poor to FairArmstrong maple 18,
(18)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
18.0
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Recommendations
Tree
267 Fair FairArmstrong maple 14.8,
(14.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
14.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
268 Poor to Fair Poor to FairArmstrong maple 14.9,
(14.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
14.9
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
17 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
269 Fair FairArmstrong maple 13.8,
(13.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
13.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
270 Fair Poor to FairArmstrong maple 13.3,
(13.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
13.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
271 Fair FairArmstrong maple 19.2,
(19.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
19.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
272 Fair FairArmstrong maple 9.2,
(9.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
9.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
18 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
273 Fair FairArmstrong maple 8.3,
(8.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
8.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
274 Fair FairArmstrong maple 8.7,
(8.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
8.7
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Recommendations
Tree
275 Fair FairArmstrong maple 6.8,
(6.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Armstrong'
CRZ (ft)
6.8
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Tree Protection Required,
Monitor During Construction
Recommendations
Tree
276 Poor Poor to FairAutumn blaze 5.5,
(5.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Acer x freemanii
'Jeffersred'
CRZ (ft)
5.5
Tree is Not Significant and in very poor health.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
19 Date:
6/19/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
277 Poor PoorRed sunset red 7.3,
(7.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Acer rubrum
'Franksred'
CRZ (ft)
7.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
278 Fair FairAutumn applause 5.5,
(5.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
5.5
Not SignificantNotes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Critical Root Zone Treatment
Clearance Prune
Recommendations
Tree
279 Fair Poor to FairAutumn applause 6.2,
(6.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
6.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Critical Root Zone Treatment
Root Prune
Clearance Prune
Recommendations
Tree
280 Fair FairAutumn applause 7,
(7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
7.0
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Root Prune
Critical Root Zone Treatment
Clearance Prune
Recommendations
20 Date:
6/14/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
281 Fair FairAutumn applause 6.2,
(6.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
6.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Critical Root Zone Treatment
Clearance Prune
Recommendations
Tree
282 Fair Poor to FairAutumn applause 7,
(7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
7.0
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Root Prune
Critical Root Zone Treatment
Clearance Prune
Recommendations
Tree
283 Fair FairAutumn applause 6.5,
(6.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
6.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Critical Root Zone Treatment
Clearance Prune
Recommendations
Tree
284 Fair Poor to FairAutumn applause 5.7,
(5.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
5.7
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Root Prune
Critical Root Zone Treatment
Clearance Prune
Recommendations
21 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
285 Fair FairAutumn applause 7.1,
(7.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
7.1
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Critical Root Zone Treatment
Clearance Prune
Recommendations
Tree
286 Fair FairAutumn applause 4.5,
(4.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
4.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Critical Root Zone Treatment
Clearance Prune
Recommendations
Tree
287 Fair FairAutumn applause 4.4,
(4.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
4.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Remove Tree, Construction Impact
Recommendations
Tree
288 Poor to Fair FairAutumn applause 3.6,
(3.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus americana
'Autumn Applause'
CRZ (ft)
3.6
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Critical Root Zone Treatment
Recommendations
22 Date:
6/7/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
289 Poor Poor to FairLeprechaun ash 2,
(2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.0
Trees along this ROW are extremely thin for their height and may break under canopy weight. Leaves are smaller than normal for this variety with a high amount of epicormic
sprouting. In some cases looking like residual growth regulator spray impacts.
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
290 Fair to Good Poor to FairLeprechaun ash 2.75,
(2.75)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.8
Trunk has a lean, tree stakes were removed too early.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Tree Protection Required,
Recommendations
Tree
291 Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
Canopy pruned very high. .Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Tree Protection Required,
Recommendations
Tree
292 Poor to Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
Some branch die back in addition to over pruning.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
23 Date:
6/19/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
293 Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
One of the healthier trees in the row.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Medium
Monitor During Construction
Tree Protection Required,
Recommendations
Tree
294 Poor to Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
Poor root system and pruning. Sun scald on trunk.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
295 Fair Poor to FairLeprechaun ash 2.3,
(2.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.3
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Tree Protection Required,
Recommendations
Tree
296 Poor to Fair Poor to FairLeprechaun ash 2.3,
(2.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.3
Poor pruning and die back in very small canopy.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
24 Date:
6/19/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
297 Poor Poor to FairLeprechaun ash 2.3,
(2.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.3
Root crown is buried.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
298 Poor to Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Recommendations
Tree
299 Fair Poor to FairLeprechaun ash 2.5,
(2.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Tree Protection Required,
Recommendations
Tree
300 Poor to Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Remove Tree, Construction Impact
Recommendations
25 Date:
6/19/2019
6/19/2019
Field Work Completed:
Tree Assessment Matrix
Boeing S1 Parking Lot Apron E
Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
A. Heckman
Tree
301 Poor to Fair Poor to FairLeprechaun ash 2.2,
(2.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.2
Root crown below grade.Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
None
Remove Tree Poor Health
Remove Tree, Construction Impact
Recommendations
Tree
302 Poor to Fair Poor to FairLeprechaun ash 2.4,
(2.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.4
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Tree Protection Required,
Recommendations
Tree
303 Poor to Fair Poor to FairLeprechaun ash 2.5,
(2.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Fraxinus
pennsylvanica
‘Johnson’ PP 9136
CRZ (ft)
2.5
Notes/Defects
Noted Tree:Ye
s
Pres. Cat/Value
Low
Monitor During Construction
Tree Protection Required,
Recommendations
26 Date:
6/7/2019
6/19/2019
Field Work Completed:
General Tree Protection Guidelines
By Urban Forestry Services, Inc.
2011-12
Page 1 of 3
General Tree Protection Guidelines
With Critical Root Zone Explanation Attachment
1. Responsibilities: These Guidelines pertain to any disturbance, use or activity within the Critical
Root Zone of any retained tree on this project. See attached Critical Root Zone Explanation
for reference. The owner’s arborist and general contractor shall meet onsite before any site
work begins, to review and designate the most appropriate methods to be used to protect the
retained trees during construction.
These guidelines apply to work provided by all contractors and sub-contractors on the project.
The project consulting arborist shall be contacted prior to any work that may need to enter the
tree protection fencing. Two days notice shall be provided to the project consulting arborist. A
proposed method for work shall be provided to the arborist. This method shall be reviewed by
the project consulting arborist and either approval and / or comments provided by the project
consulting arborist prior to commencing works within the tree protection area. He or she should
be notified within 8 hours should any injury occur to any protected tree or its larger roots
(greater than 2-inch diameter) so that appropriate assessment and/or treatment may be made.
2. Soil Disturbance: No soil disturbance shall take place before tree protection fences are
installed. All evaluated trees to be retained within these areas are clearly illustrated on the Site
Plan.
3. Designated Tree Removals: The owner’s arborist and contractor shall confirm on site which
trees are to be removed and those to be retained. Directional felling and removal of trees will
be completed with great care to avoid any damage to the trunks, limbs, and critical root zones
of the retained trees.
4. The Tree Protection Site Plan shows the recommended location of the Tree Protection Fence
(TPF). Immediately after the clearing limits and grading stakes are set in the field, the owner’s
arborist, during review and discussion with the contractor, will make a final determination on the
tree protection requirements depending on construction limits and impact on major roots and
soil condition. The arborist may adjust clearing limits in the field so that, in his/her opinion, tree
roots and soils are protected while necessary work can proceed.
5. The Tree Protection Fence (TPF) shall be installed along the clearing limits, with special
consideration of the Critical Root Zone (CRZ) of trees to be preserved. The CRZ of a tree is
generally described as an area equal to 1-foot radius for every 1-inch diameter of tree. For
example, a 10-inch diameter tree has a CRZ of 10-foot radius. Work within the CRZ may be
limited to hand work or alternate method of construction.
The Tree Protection Fence (TPF) shall be constructed with steel posts driven into the ground
with 6-ft. chain link fence attached. Upon consultation with the contractor, the arborist shall
determine the placement of the fence and the extent and method of clearing that may be done
General Tree Protection Guidelines
By Urban Forestry Services, Inc.
2011-12
Page 2 of 3
near preserved trees. Additional follow-up determinations may be required as work progresses
on the project. See attached Critical Root Zone Explanation.
No parking, storage, dumping, or burning of materials is allowed beyond the clearing limits or
within the Tree Protection Fence.
The TPF shall not be moved without authorization by the owner’s arborist or City arborist. The
TPF shall remain in place for the duration of the project.
Work within this area shall be reviewed with and approved by the owner’s arborist. Call Urban
Forestry Services, Inc. at 360-428-5810 with questions.
6. Silt Fence: If a silt fence is required to be installed within the Critical Root Zone of a retained
tree, the bottom of the silt fence shall not be buried in a trench, but instead, folded over and
placed flat on the ground. The flat portion of the silt fence shall be covered with gravel or soil
for anchorage.
7. CRZ over Hardscape: Where the Critical Root Zone (CRZ) includes an area covered by
hardscape, the TPF can be placed along the edge of the hardscape if and until it is removed.
After hardscape removal, the available CRZ should be backfilled with topsoil up to 6 inches
deep and protected with the TPF. Incorporation of topsoil into the existing sub-grade shall be
determined by the consulting arborist. Where applicable a specification for topsoil will be
provided or approved by Urban Forestry Services, Inc.
8. Tree Protection Signs shall be attached to the fence only and shall be shown as required on
the Site Plan. They should read “Protect Critical Root Zone (CRZ) of trees to be retained. No
soil disturbance, parking, storage, dumping, or burning of materials is allowed within the Tree
Protection Barrier. " Monetary Fines based on the appraised dollar value of the retained trees
may also be included on these signs. Telephone contact details for the project consulting
arborist should also be included in the sign.
9. Soil Protection within the Critical Root Zone (CRZ): Where vehicular access, temporary
work pad or storage pad is required within the CRZ of any preserved tree that is not protected
with hardscape, the soil shall be protected with 18” of woodchips and/or plywood or metal
sheets to protect from soil compaction and damage to roots of retained trees. A biodegradable
coir mat netting is recommended to be placed on the existing grade before woodchip placement
to protect the condition and confirm the location of the existing grade. The netting is a valuable
benchmark upon removal of the material within the CRZ.
10. Landscape Plans, Irrigation Design and Installation Details: Great care shall be exercised
when landscaping within the Critical Root Zone (CRZ) of any tree. Roots of preserved trees
and other vegetation shall not be damaged by planting or installation of irrigation lines The
owner’s arborist shall review the Landscape Plan for any potential design and tree preservation
conflicts and approve related irrigation and landscape installation activities within the CRZ of
retained trees. A proposed method for work shall be provided to and approved by the arborist.
11. Backfill and Grade Changes: The owner’s arborist will determine to what extent backfilling
may be allowed within the Critical Root Zone of a preserved tree, and if needed, the specific
General Tree Protection Guidelines
By Urban Forestry Services, Inc.
2011-12
Page 3 of 3
material which may be used. Grade cuts are usually more detrimental than grade filling within
the CRZ and should be reviewed by the arborist well in advance of construction.
12. Tree Maintenance and Pruning: Trees recommended for maintenance and approved by the
owner, shall be pruned for deadwood, low hanging limbs, and proper balance, as
recommended for safety, clearance or aesthetics. All pruning shall be done by an International
Society of Arboriculture Certified Arborist. ANSI A300 American Standards for Pruning shall be
used. Limbs of retained trees within 10 feet or less, of any power line, depending on power line
voltage, may only be pruned by a Utility Certified Arborist. This pruning must be coordinated
with the local power company, as they may prefer to provide this pruning.
13. Underground Utilities: Utility installation within the Critical Root Zone (CRZ) of any retained
tree shall be reviewed by the Project Consulting Arborist. A less root disturbing route or
minimal impact installation method of utility installation may be discussed and recommended
i.e. tunneling or trenchless excavation. Trenching through the Interior CRZ of a retained tree is
not usually allowed. See CRZ Explanation to differentiate between the Perimeter and
Interior CRZ. An Air spade and Vac., Truck may be required when utility installation is
mandatory near a retained tree or other methodology such as trenchless excavation.
14. Root Pruning: Required work may result in the cutting of roots of retained trees. Cutting roots
2” or greater should be avoided. Potential root pruning needs should be reviewed in advance
with the Project Consulting Arborist to minimize potential root fracturing and other damage.
Severed roots of retained trees shall be cut off cleanly with a sharp saw or pruning shears.
Applying pruning paint on trunk or root wounds is not recommended. Severed roots shall be
covered immediately after final pruning with moist soil or covered with mulch until covered with
soil. Excavation equipment operators shall take extreme care not to hook roots and pull them
back towards retained trees. In all cases, the excavator shall sit outside of the CRZ. Soil
excavation within the CRZ shall be under the direct supervision of the owner’s arborist.
15. Supplemental Tree Irrigation: If clearing is performed during the summer, supplemental watering
and/or mulching over the root systems within the Tree Protection Fencing of preserved trees may be
required by the owner’s arborist. The arborist should be notified of the proposed schedule for clearing
and grading work. Supplemental watering and mulching over the root systems of roots impacted or
stressed trees are strongly recommended to compensate for root loss and initiate new root growth.
Long periods of slow drip irrigation will be most effective. A large coil of soaker hose starting at least
18" from the trunk and covering the Interior Critical Root Zone area is recommended. Water once
per week and check soils for at least 12 inches infiltration. This work shall be under the direct
supervision of the owner’s arborist.
16. Additional Measures: Additional tree protection recommendations may be required and may be
specified in Urban Forestry Services, Inc. report(s).
17. Final Inspection: The owner’s arborist shall make a final site visit to report on retained tree condition
following completed work and shall report to the city to release the bond for the retained trees.
Urban Forestry Services, Inc.
15119 McLean Rd.
Mount Vernon, WA 98273
Title: Critical Root Zone (CRZ) Explanation
Source: Urban Forestry Services, Inc
Jim Barborinas, ISA Certified Arborist PN-0135
ASCA Registered Consulting Arborist #356,
Tree Risk Assessor Qualified
Date: 2018 Not to Scale
The Critical Root Zone (CRZ) of a tree is established on the basis of the trunk diameter.
The CRZ is a circular area which has a radius of 12 inches for every inch diameter of trunk
measured at 4.5 feet above grade. Root systems will vary both in depth and spread depending
on size of tree, soils, water table, species and other factors . However, this CRZ description is
generally accepted in the tree industry. Protecting this entire root zone area should result in no
adverse impact to the tree, except for potentially increased exposure.
The above CRZ drawing has been further differentiated into the ’Perimeter’ (PCRZ) and
‘Interior’ (ICRZ) to help define potential impact and required Post Care.
Generally, the full PCRZ is considered the optimum amount of root protection for a tree.
As one encroaches into the “Perimeter CRZ, but not into the “Interior CRZ” the greater Post
Care the tree would require to remain alive and stable. The ‘Interior CRZ is half the radius of the
full PCRZ. Disturbance into the ICRZ could destabilize or cause the tree to decline.
The ‘Interior’ CRZ should never be disturbed if the tree is to have any chance of survival.
This ‘Interior’ CRZ would approximately equal the size of a rootball needed to transplant this
tree which in turn would require extensive Post Care and possibly guying.
This Post Care Treatment would include but may not be limited to; regular irrigation,
misting, root treatment with special root hormones or growth stimulants, mulching, guying and
monitoring for several years. Lack of this treatment would be fatal.
Tree Trunk
Critical Root Zone
(CRZ) =
12” Radius for every
Tree inch diameter is
generally considered
optimum protection.
Perimeter Critical
Root Zone (PCRZ)
= the outer half of the
CRZ
The greater the
disturbance allowed in
this area, the greater
Post Care is required.
Interior Critical Root
Zone (ICRZ)
= the inner half of the
CRZ
Protecting only this area
would cause significant
impact to the tree,
potentially life
threatening, and would
require maximum Post
Care Treatment to retain
the tree. See Post Care
Treatment below.
ASSUMPTIONS AND LIMITING CONDITIONS
Urban Forestry Services, Inc.
15119 McLean Rd.
Mount Vernon, Washington 98273
1. Limitations of this Assessment
This Assessment is based on the circumstances and observations as they existed at the time
of the site inspection of the Client’s Property and the trees inspected by Urban Forestry
Services, Inc. and upon information provided by the Client to Urban Forestry Services, Inc.
The opinions in this Assessment are given based on observations made and using genera lly
accepted professional judgment, however, because trees and plants are living organisms and
subject to change, damage, and disease, the results, observations, recommendations, and
analysis took place and no guarantee, warranty, representation, or opinio n is offered or made
by Urban Forestry Services, Inc. as to the length of the validity of the results, observations,
recommendations, and analysis contained within this Assessment. As a result, the Client shall
not rely upon this Assessment, save and except for representing the circumstances and
observations, analysis, and recommendations that were made as at the date of such
inspections. It is recommended that the trees discussed in this Assessment should be re -
assessed periodically.
Urban Forestry Services, Inc. shall not be required to give testimony or to attend court by
reason of this report unless subsequent contractual arrangements are made, including
payment of an additional fee for such services as described in our fee schedule and contract
of engagement.
Sketches, diagrams, graphs, and photographs in this report, being intended as visual aids, are
not necessarily to scale and should not be construed as engineering or architectural reports or
surveys.
2. Reaction of Assessment
The Assessment carried out was restricted to the Property. No assessment of any other trees
or plants has been undertaken by Urban Forestry Services, Inc. Urban Forestry Services, Inc.
is not legally liable for any other trees or plants on the Property except those expressl y
discussed herein. The conclusions of this Assessment do not apply to any areas, trees,
plants, or any other property not covered or referenced in this Assessment.
3. Professional Responsibility
In carrying out this Assessment, Urban Forestry Services, Inc. and any Assessor appointed for
and on behalf of Urban Forestry Services, Inc. to perform and carry out the Assessment has
exercised a reasonable standard of care, skill, and diligence as would be customarily and
normally provided in carrying out this Assessment. The Assessment has been made using
accepted arboricultural techniques. These include a visual examination of each tree for
structural defects, scars, external indications of decay such as fungal fruiting bodies, evidence
of insect attack, discolored foliage, the condition of any visible root structures, the degree and
direction of lean (if any), the general condition of the tree(s) and the surrounding site, and the
current or planned proximity of property and people. Except where specifically n oted in the
Assessment, none of the trees examined on the property were dissected, cored, probed, or
climbed and detailed root crown examinations involving excavation were not undertaken.
While reasonable efforts have been made to ensure that the trees recommended for retention
are healthy, no guarantees are offered, or implied, that these trees, or all parts of them will
remain standing. It is professionally impossible to predict with absolute certainty the behavior
of any single tree or group of trees, or all their component parts, in all given circumstances.
Inevitably, a standing tree will always pose some risk. Most trees have the potential to fall,
lean, or otherwise pose a danger to property and persons in the event of adverse weather
conditions, and this risk can only be eliminated if the tree is removed.
Without limiting the foregoing, no liability is assumed by Urban Forestry Services, Inc. or its
directors, officers, employers, contractors, agents, or Assessors for:
• any legal description provided with respect to the Property;
• issues of title and or ownership respect to the Property;
• the accuracy of the Property line locations or boundaries with respect to the Property; and
• the accuracy of any other information provided to Urban Forestry Ser vices, Inc. by the
Client or third parties;
• any consequential loss, injury, or damages suffered by the Client or any third parties,
including but not limited to replacement costs, loss of use, earnings, and business
interruption; and
• the unauthorized distribution of the Assessment.
The total monetary amount of all claims or causes of action the Client may have as against
Urban Forestry Services, Inc. including but not limited to claims for negligence, negligent
misrepresentation, and breach of contract, shall be strictly limited to solely to the total amount
of fees paid by the Client to Urban Forestry Services, Inc. pursuant to the Contract for
Services as dated for which this Assessment was carried out. Further, under no circumstance
may any claims be initiated or commenced by the Client against Urban Forestry Services, Inc.
or any of its directors, officers, employees, contractors, agents, or Assessors, in contract or in
tort, more than 12 months after the date of this Assessment.
4. Third Party Liability
This Assessment was prepared by Urban Forestry Services, Inc. exclusively for the Client.
The contents reflect Urban Forestry Services, Inc. best assessment of the trees and plants on
the Property in light of the information available to it at the time of preparation of this
Assessment. Any use which a third party makes of this Assessment, or any reliance on or
decisions made based upon this Assessment, are made at the sole risk of any such third
parties. Urban Forestry Services, Inc. accepts no responsibility for any damages or loss
suffered by any third party or by the Client as a result of decisions made or actions based
upon the use of reliance of this Assessment by any such party.
5. General
Any plans and/or illustrations in this Assessment are included only to help the Client visualize
the issues in this Assessment and shall not be relied upon for any other purpose.
This report and any values expressed herein represent the opinion of Urban Forestry
Services, Inc. Our fee is in no way contingent upon any specified value, a result or
occurrence of a subsequent event, nor upon any finding reported.
The Assessment report shall be considered as a whole, no sections are severable, and the
Assessment shall be considered incomplete if any pages are missing. The right is reserved to
adjust tree valuations, if additional relevant information is made available. This Assessment is
for the exclusive use of the Client.
Title: Boeing Parking Lot S2 Fire Station Development
Level 2 Basic Tree Risk Assessment
Renton, Washington
Prepared for: HBB Architects
Attn: Mr. Aaron Luoma
215 Westlake Ave. North
Seattle, Washington 98109-5217
Prepared by: Urban Forestry Service, Inc.
Anna Heckman
ISA Board Certified Master Arborist® #PN-6153B,
ISA Tree Risk Assessment Qualified
Reviewed by: Paul Hans Thompson, Consulting Associate
Date: August 14, 2019
Contents
Summary
Introduction
Findings and Recommendations
Method of Assessment
Site Map with Trees Located
Tree Assessment Matrix
Tree Protection and Soil enhancement Guidelines
Assumptions and Limiting Conditions
Summary
A Level 2 Basic Tree Risk Assessment was conducted on fifty-seven (57) trees in and
surrounding the S2 parking lot in Renton, Washington. Seven trees (#’s 601-607) proposed for
removal are non-significant by size and therefore do not require permitting. All fourteen (14)
trees in the parking lot islands are non-significant, in poor condition, and should be replaced.
The forty-three (43) trees along the south and east parking lot perimeter landscape are in good
condition but would benefit from landscape maintenance. Twenty-one (21) of these (#’s 551-
572) are within the construction area and will require tree protection prior to construction. No
mitigation plantings are required at this time.
Boeing Lot 2 Fire station, Tree Risk Assessment
Urban Forestry Services, Inc.
August 14, 2019 Page 2 of 4
Introduction
As requested by Aaron Luoma with HBB, I visited the Boeing S2 parking lot north of
North 6th St and west of Logan Ave N. in Renton Washington on July 24th, 2019. The purpose
of this work was to map and assess the trees that may be impacted by the development of the
new fire station.
The tree survey and 45% design documents provided by HBB identify trees in eight-foot-
wide parking lot islands and along large planting strips on the south and east perimeter of the
parking lot. While conducting the risk assessment, trees were identified with numbered
aluminum tags beginning with #551 on the south west side of the parking lot. Tags are nailed to
the north side of the trunk at eye level. Trees are individually identified on the attached Tree Site
Plan with photo and data for each tree provided in the attached Tree Assessment Matrix.
Tree retention and land clearing regulations for the city of Renton; municipal code 4-4-130
Tree Retention and Land Clearing Regulations, identify Significant trees as 6 inches diameter
and 8 inches for cottonwood (Populous trichocarpa) or red alder (Alnus rubra) unless they are
considered “dangerous”. Landmark trees are over 30 inches. Priority tree retention
requirements (section H1b.) should be implemented in tree preservation selection on the site.
Findings and Recommendations:
Interior Parking Lot Area:
The fourteen (14) trees in the interior parking lot islands near the planned fire station are in
very poor condition (#594-607,). The soil is compacted and shallow and lacks organic matter.
All these trees are non-significant as they are less than six inches diameter. No interior parking
lot trees require mitigation for removal.
Photo 1: The southern landscape perimeter is one contiguous landscape bed with ample rooting space across the width of the
landscape bed onto the ROW edge of North 6th street.
Boeing Lot 2 Fire station, Tree Risk Assessment
Urban Forestry Services, Inc.
August 14, 2019 Page 3 of 4
Perimeter Parking Lot Landscape Areas:
The twenty-eight 28 (#551- 578, 608) perimeter
landscape trees along the south edge of the parking lot
between the future fire station and North 6th Street are in
very good condition. Eight (8) of these trees are non-
significant, six (6) of which are vine maples that are large
for their size but do not measure as a significant tree. All
of these trees are within the construction impact area and
will be damaged if not protected.
The fifteen (15) trees along the east perimeter
landscape are similar to those along the south landscape in
species size health and diversity. There are eleven (11)
different species growing along the perimeter landscapes
with significant tree diameters ranging from 6.0 – 17.1
inches. No exceptional trees are on this site.
Both the south and east perimeter landscape beds have
compacted soils with little organic matter and no mulch.
All the trees in these planting beds will benefit from a soil
renovation treatment using an air spade and compost or
biochar with a wood chip mulch top dressing.
The following recommendations balance the benefits of
retaining trees on site with the reasonable ability for those trees to survive construction and
provide benefits to the new site with a reasonable amount of investment. Tree retention numbers
and mitigation requirements are expected to change as site plans are altered.
Recommendations:
1. Remove 13 of the 14 non-significant trees inside the parking lot islands (#595-607)
These trees are dead or in very poor condition. Parking lot islands that will remain
through construction should have coarse wood chip mulch placed over the soil to the top of
curb to protect curb edges and irrigation. Soils should be renovated, and new healthy trees
planted after construction.
2. Protect the twenty eight (28) trees along the south perimeter landscape (#551-578, 608)
within the construction area.
Most of these trees are healthy and significant and will require replacement if removed or
damaged during construction. The whole landscape bed should be fenced off using 6-foot
chain link fence placed on the pavement side of the curb. Supplemental irrigation and coarse
wood chip mulch should be installed to protect the soil and improve tree resilience prior to
construction.
Photo 2: Parking lot islands measure eight
feet wide with two trees in each island. Red
maple trees growing in the parking lot islands
have over 50% dieback and are not worth
retaining.
Boeing Lot 2 Fire station, Tree Risk Assessment
Urban Forestry Services, Inc.
August 14, 2019 Page 4 of 4
If construction is required within the landscape bed an arborist should be on site to
identify the Tree Protection Areas based on the size of the tree. No work should be
conducted with the Tree Protection Area without an arborist on site to monitor this work.
See the attached mature tree care and tree protection guidelines for further guidance.
3. Monitor the remaining 21 trees along the southeast perimeter landscape that boarder
the construction site.
The remaining trees along the east side perimeter landscape (#579-594) are likely outside
the fenced off construction area and may only require monitoring for pre and post
construction condition. These trees should be protected with fencing and soil protection
similar to the other perimeter trees if the parking lot in this area is planned for construction
staging or any activity associated with construction.
4. Enhance the soil within the existing south and east perimeter landscape beds.
Improving the soil conditions will improve tree health and growth in these perimeter
landscape beds. See the attached soil enhancement guidelines for further guidance.
Conclusion:
Based on the provided plans, no significant trees will be removed from this site, and with
appropriate protection, the thirty-four (34) significant trees in the south and east perimeter
landscape beds should survive standard construction impacts and continue to provide the
required landscape buffer for the area. No trees are required to be planted for mitigation
purposes at this time. If removal of any significant trees is required for future design changes,
the tree retention and removal permit can be filled out and submitted to the city.
Method of Assessment
This Level 2 Basic Tree Risk Assessment was conducted according to the ISA Tree Risk
Assessment Qualification (TRAQ) training and methodology (see the attached Tree Risk
Assessment Level Descriptions). While no one can predict with absolute certainty which trees
will fail and which trees will remain healthy, by methodical process we can predict those most
likely to fail by the conditions observed and take appropriate action to reduce or eliminate the
potential hazard. The time frame for this Level 2 Basic Tree Risk Assessment considers
expected conditions and issues over the next year. Because tree conditions change over time,
further assessment may be necessary in the future.
Page 1 of 2
August 10, 2019
Boeing Fire station, Tree Inventory
Renton, Washington
URBAN FORESTRY SERVICES, INC.
15119 McLean Road
Mount Vernon, WA 98273
PRESERVATION VALUE SYMBOLS
SPECIAL, UNIQUE SPECIES, SPECIMEN OR
FORM. SAVE.
HIGH, GOOD QUALITY, CHARACTER TREE.
SAVE IF POSSIBLE.
MODERATE, COMMON SPECIES, FAIR CONDI-
TION. MAY NEED SPECIAL ATTENTION TO
PRESERVE.
LOW, POOR SPECIMEN OR SPECIES. HIGH
MAINTENANCE OR SOME CAUTION IF RE-
TAINED.
“DANGEROUS” - HAZARD OR DEAD , DIS-
EASED, OR NOT SIGNIFICANT. TREE IS DEAD
OR IN VERY POOR CONDITION ND SHOULD BE
REMOVED.
NON SIGNIFICANT TREE < 6” DIAMETER
SIGNIFICANT TREE > 6” DIAMETER
GREEN BOARDER INDICATES CONIFER
####
####
Insert 1. Trees within the Proposed
Construction area
Minimum Tree Protection Fence
Placement Recommendation
#575
#578 #577
#573 #576
#574
#579
#580
#581
#584
#590
#572 #582
#585
#583
#586
#587
#591
#588 #589
#592
#593
Insert 1, Page 2 of 2
August 10, 2019
Boeing Fire station, Tree Inventory
Renton, Washington
URBAN FORESTRY SERVICES, INC.
15119 McLean Road
Mount Vernon, WA 98273
PRESERVATION VALUE SYMBOLS
SPECIAL, UNIQUE SPECIES, SPECIMEN OR
FORM. SAVE.
HIGH, GOOD QUALITY, CHARACTER TREE.
SAVE IF POSSIBLE.
MODERATE, COMMON SPECIES, FAIR CONDI-
TION. MAY NEED SPECIAL ATTENTION TO
PRESERVE.
LOW, POOR SPECIMEN OR SPECIES. HIGH
MAINTENANCE OR SOME CAUTION IF RE-
TAINED.
“DANGEROUS” - HAZARD OR DEAD , DIS-
EASED, OR NOT SIGNIFICANT. TREE IS DEAD
OR IN VERY POOR CONDITION ND SHOULD BE
REMOVED.
NON SIGNIFICANT TREE <6” DIAMETER
SIGNIFICANT TREE >6” DIEAMETER
GREEN BOARDER INDICATES CONIFER ####
####
#602
#603
#573 #570
#604
#567
#606 #596
#595
#601
#607
#551
#598
#600
#597
#599
#605
#566 #563 #564
#565 #562
#561
#560 #559 #553 #556
#552 #569
#568
#558
#554 #572
#571 #557 #555
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
551 Poor to Fair FairRed maple 2.8,
(2.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer rubrum
Notes /DefectsCRZ (ft)
2.8
Tree
552 Sawtooth oak 6.4,
(6.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk Pres. Cat/Value
Tree Protection Required, Monitor During
Construction
Recommendations
Quercus acutissima
Notes /DefectsCRZ (ft)
6.4
1 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
553 Good FairAtrovirens western 8, 5.3
(9.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Thuja plicata
'Atrovirens'
Excelsea or Hogan variety
Notes /DefectsCRZ (ft)
9.6
Tree
554 Fair FairVine maple 2.2, 2.0,
1.9, 1.7
(3.92)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer circinatum
Not Significant. Cherrytree # 608 located behind the fence
Notes /DefectsCRZ (ft)
3.9
2 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
555 Fair FairVine maple 2.8, 1.5,
1.1
(3.36)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer circinatum
Notes /DefectsCRZ (ft)
3.4
Tree
556 Poor to Fair Fair to GoodSawtooth oak 7.1,
(7.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Tree Protection Required, Monitor During
Construction
Recommendations
Quercus acutissima
Landscape is low on woodchips.Notes /DefectsCRZ (ft)
7.1
3 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
557 Good GoodFlame maple 3.7, 2.2,
3.0, 2.3,
3.5, 3.2,
1, 1
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Acer ginnala
'Flame'Notes /DefectsCRZ (ft)
7.6
Tree
558 Fair to Good FairFlame maple 3, 2, 2,
2, 2, 1,
1, 1
(5.29)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer ginnala
'Flame'Notes /DefectsCRZ (ft)
5.3
4 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
559 Good GoodAtrovirens western 7,
(7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Thuja plicata
'Atrovirens'
Cedar cultivar. Also could be Excelsea or Hogan variety.Notes /DefectsCRZ (ft)
7.0
Tree
560 Fair FairAlaska yellow cedar 6, 3.6,
2.5
(7.43)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Tree Protection Required, Monitor During
Construction
Recommendations
Callitropsis
nootkatensis
IPs beetle or similar pinhole bark beetle indicating some stress. Some branch die back but the tree overall is healthy.Notes /DefectsCRZ (ft)
7.4
5 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
561 Fair to Good FairRiver birch 7.5,
(7.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Betula nigra
This species is the only birch on site with no current indication of Bronze Birch Borrer.Notes /DefectsCRZ (ft)
7.5
Tree
562 Good GoodScot's pine 14.5,
(14.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Pinus sylvestris
Notes /DefectsCRZ (ft)
14.5
6 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
563 Fair GoodKatsura tree 7.8,
(7.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Tree Protection Required, Monitor During
Construction
Recommendations
Cercidiphyllum
japonicum
Shallow roots, both trees have yellowing leaf color. Direct south sun exposure and are a stress to this species. Wood chip mulch is recomended to insulate the roots and retain water.Notes /DefectsCRZ (ft)
7.8
Tree
564 Fair FairKatsura tree 6,
(6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Tree Protection Required, Monitor During
Construction
Recommendations
Cercidiphyllum
japonicum
Tree has a double leader that can be reduced to improve future growth. An unknown orange flag is on the tree.Notes /DefectsCRZ (ft)
6.0
7 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
565 Good GoodAustrian pine 12.8,
(12.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Pinus nigra
Notes /DefectsCRZ (ft)
12.8
Tree
566 Fair to Good FairAustrian pine 15.1,
(15.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Tree Protection Required, Monitor During
Construction
Recommendations
Pinus nigra
Remove ivy from the tree. Tree is located behind irrigation boxes. moving irrigation boxes will impact tree roots.Notes /DefectsCRZ (ft)
15.1
8 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
567 Good GoodAtrovirens western 8, 8, 4
(12)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Tree Protection Required, Monitor During
Construction
Recommendations
Thuja plicata
'Atrovirens'
Multi stem. Cedar cultivar.Notes /DefectsCRZ (ft)
12.0
Tree
568 Good GoodVine maple 4.5,
(4.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer circinatum
Diameter taken at 3’ from the ground below the split trunk.Notes /DefectsCRZ (ft)
4.5
9 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
569 Fair to Good FairVine maple 3, 2.5,
2.5, 2.5
(5.27)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer circinatum
Hydrant between 569 and 570
Notes /DefectsCRZ (ft)
5.3
Tree
570 Good Fair to GoodAtrovirens western 8.6, 7
(11.09)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Tree Protection Required, Monitor During
Construction
Recommendations
Thuja plicata
'Atrovirens'
Cedar cultivar.Notes /DefectsCRZ (ft)
11.1
10 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
571 Fair FairVine maple 3.1, 2.7
(4.11)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Monitor Tree, During Construction
Recommendations
Acer circinatum
Notes /DefectsCRZ (ft)
4.1
Tree
572 Fair to Good FairVine maple 2.7, 2.6,
2.6
(4.56)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer circinatum
Only 2 of 3 vine maples were tagged
Third non significant vine maple third is in canopy of tree # 573. with 2.6" diameter trunk. See camera photos after 572 tag
Notes /DefectsCRZ (ft)
4.6
11 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
573 Fair to Good FairAtrovirens western 8, 6, 4
(10.77)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Thuja plicata
'Atrovirens'Notes /DefectsCRZ (ft)
10.8
Tree
574 Fair Fair to GoodSawtooth oak 8.6,
(8.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Structural Prune
Recommendations
Quercus acutissima
Measured low. Some dead branches
tree may be pruned to reduce the multiple leaders.Notes /DefectsCRZ (ft)
8.6
12 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
575 Good GoodAtrovirens western 7.8,
(7.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Thuja plicata
'Atrovirens'
Both single stem
Notes /DefectsCRZ (ft)
7.8
Tree
576 Good Fair to GoodAtrovirens western 8.7, 4.5
(9.79)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Thuja plicata
'Atrovirens'Notes /DefectsCRZ (ft)
9.8
13 Date:
7/24/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
577 Good Fair to GoodRiver birch 11.7,
(11.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Betula nigra
Notes /DefectsCRZ (ft)
11.7
Tree
578 Poor to Fair FairRiver birch 15.6,
(15.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Crown Clean Prune
Monitor Tree, During Construction
Recommendations
Betula nigra
Tree has shallow roots unlike others in the planting bed and the crown is thinner than others. one dead branch. This is the last tree on the south side.
Crown is thinner than others
Notes /DefectsCRZ (ft)
15.6
14 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
579 Austrian pine 11.2, 7.2
(13.31)
Species DBH (in)Dripline (ft)Vigor Structure Risk Pres. Cat/Value Recommendations
Pinus nigra
Tree marks the beginning of the line on the east side of the parking lot.Notes /DefectsCRZ (ft)
13.3
Tree
580 Good GoodAustrian pine 13,
(13)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Pinus nigra
Notes /DefectsCRZ (ft)
13.0
15 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
581 Fair Fair to GoodKatsura
Cercidiphyllum
6.3,
(6.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Notes /DefectsCRZ (ft)
6.3
Tree
582 Good GoodAtrovirens western 11.5, 10
(15.24)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Thuja plicata
'Atrovirens'Notes /DefectsCRZ (ft)
15.2
16 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
583 Poor to Fair Fair to GoodWeeping Alaskan 5.7, 3
(6.44)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Install Ground Protection
Critical Root Zone Treatment
Recommendations
Callitropsis
nootkatensis
'Pendula'
This tree has some drought stress. Soil rehabilitation should improve the condition.Notes /DefectsCRZ (ft)
6.4
Tree
584 Good Fair to Good7,
(7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, Maintenance
Recommendations
Katsura
Cercidiphyllum Notes /DefectsCRZ (ft)
7.0
17 Date:
8/13/2019
7/24/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
585 Good GoodAtrovirens western 11,
(11)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, Maintenance
Recommendations
Thuja plicata
'Atrovirens'Notes /DefectsCRZ (ft)
11.0
Tree
586 Fair Fair to GoodWeeping Alaskan 8, 5, 5, 4
(11.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
low
Recommendations
Callitropsis
nootkatensis
'Pendula'Notes /DefectsCRZ (ft)
11.4
18 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
587 Fair to Good GoodSawtooth oak 17.1,
(17.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Quercus acutissima
Notes /DefectsCRZ (ft)
17.1
Tree
588 Good GoodSawtooth oak 13.6,
(13.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Quercus acutissima
Notes /DefectsCRZ (ft)
13.6
19 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
589 Good GoodAtrovirens western 8, 8
(11.31)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
High
Monitor Tree, During Construction
Recommendations
Thuja plicata
'Atrovirens'Notes /DefectsCRZ (ft)
11.3
Tree
590 Fair FairGreen Ash 5.3,
(5.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Install Ground Protection
Critical Root Zone Treatment
Recommendations
Fraxinus
pennsylvanica
The landscape bed in this area is compacted and should be rejuvinated
Notes /DefectsCRZ (ft)
5.3
20 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
591 Fair FairGreen Ash 6,
(6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Critical Root Zone Treatment
Install Ground Protection
Monitor Tree, Maintenance
Recommendations
Fraxinus
pennsylvanica
Ash
Notes /DefectsCRZ (ft)
6.0
Tree
592 Poor to Fair Poor to FairPaper birch 7.5,
(7.5)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Crown Clean Prune
Monitor Tree, Maintenance
Recommendations
Betula papyrifera
Tent caterpillars in canopy. Tree should be replaced with a different species. Evidence of Bronze birch borrer damage.Notes /DefectsCRZ (ft)
7.5
21 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
593 Fair FairPaper birch 7.1,
(7.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Monitor Tree, Maintenance
Recommendations
Betula papyrifera
Tree has shallow roots and compacted soil. C
Notes /DefectsCRZ (ft)
7.1
Tree
594 Good Fair to GoodRed maple 4.7,
(4.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Acer rubrum
One of the few maples in the street islands that is doing well.Notes /DefectsCRZ (ft)
4.7
22 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
595 Poor FairRed sunset red 3,
(3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
3.0
Tree
596 Poor Poor to FairRed sunset red 3,
(3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Remove Tree
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
3.0
23 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
597 Dying/Dead PoorRed sunset red 3,
(3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
3.0
Tree
598 Poor PoorRed sunset red 3.1,
(3.1)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Remove Tree
Recommendations
Acer rubrum
'Franksred'
8’ width
Notes /DefectsCRZ (ft)
3.1
24 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
599 2.9,
(2.9)
Species DBH (in)Dripline (ft)Vigor Structure Risk Pres. Cat/Value
Remove Tree
Recommendations
Notes /DefectsCRZ (ft)
2.9
Tree
600 Poor Poor to FairRed sunset red 3.3,
(3.3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
3.3
25 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
601 Fair Fair to GoodCleveland select 3.8,
(3.8)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Pyrus calleryana
'Cleveland Select'
Pear
Notes /DefectsCRZ (ft)
3.8
Tree
602 Poor Poor to FairRed maple 3.6,
(3.6)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree, Construction Impact
Recommendations
Acer rubrum
Significant crown loss remove and replace
Notes /DefectsCRZ (ft)
3.6
26 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
603 Poor FairRed maple 3.2,
(3.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Low
Remove Tree, Construction Impact
Recommendations
Acer rubrum
Remove dead
Notes /DefectsCRZ (ft)
3.2
Tree
604 Dying/Dead FairRed sunset red 3,
(3)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree
Recommendations
Acer rubrum
'Franksred'
The leaves of this maple look like a small fremanii cross.Notes /DefectsCRZ (ft)
3.0
27 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
605 Dying/Dead FairRed sunset red 3.2,
(3.2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
3.2
Tree
606 Poor to Fair FairRed sunset red 3.7,
(3.7)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree, Construction Impact
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
3.7
28 Date:
7/24/2019
8/13/2019
Field Work Completed:
Tree Assessment Matrix
S2 parking lot fire station Inspector:
ISA Certified Arborist
ISA Tree Risk Assessment Qualified
Urban Forestry Services, Inc.
15119 McLean Road
Mount Vernon, WA 98273
(360) 428-5810
Heckman
Tree
607 Dying/Dead Dying/DeadRed sunset red 2,
(2)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
None
Remove Tree
Recommendations
Acer rubrum
'Franksred'Notes /DefectsCRZ (ft)
2.0
Tree
608 Good GoodCherry5.4,
(5.4)
Species DBH (in)Dripline (ft)Vigor Structure Risk
Low
Pres. Cat/Value
Medium
Monitor Tree, During Construction
Recommendations
Prunus species
Tree is located in the right of way outside the fence. Further ID can be provided.Notes /DefectsCRZ (ft)
5.4
29 Date:
7/24/2019
8/13/2019
Field Work Completed:
SHEET TITLE: TREE PROTECTION FENCE DETAIL
PREPARED BY
NOT TO SCALE
2017
URBAN FORESTRY SERVICES, INC. 15119 McLEAN ROAD MOUNT VERNON, WA 98273
Sheet 1 of 1
TREE PROTECTION AREA— PROTECTION FENCE
Tree protection sign (See “General Tree
Protection Guidelines”, item no. 8).
Any work within the tree protection fence
is to be reviewed and monitored by the
arborist.
Steel posts anchored into the ground
and 6-foot chain link fence.
Fence is not to be moved without au-
thorization by the arborist.
No parking, storage, dumping within
the tree protection fence.
SEE “GENERAL TREE PROTECTION GUIDELINES” FOR ADDITIONAL DETAILS.
FENCE FENCE FENCE
DRIPLINE DRIPLINE DRIPLINE
Apply 18-inches of woodchips or other
ground protection measures within the
protection area. See “General Tree Pro-
tection Guidelines” for additional details
(Item no.9 “Soil protection”.)
ICRZ ICRZ PCRZ PCRZ
7.5 ft. radius
EXAMPLE: 15-inches diameter at 4.5-feet above grade.
The CRZ radius
equals 15-feet, meas-
ured from the center
of the trunk.
If approved by the UFS, Inc., project arborist, the outer 50% of the PCRZ may be disturbed; in this example this is equal to 3.25-feet (shaded area) of the 15-feet CRZ radius.
CRZ
7.5 ft. radius
CRZ CRZ CRZ
SEE “CRITICAL ROOT ZONE (CRZ) EXPLANATION” FOR ADDITIONAL DETAILS.
The Critical Root Zone (CRZ) is calculated by converting the trunk diameter in inches to a radial distance in feet; 1-inch diameter equals 1-foot radial distance.
NOT TO SCALE
ICRZ PCRZ PCRZ ICRZ
7.5 ft. radius 7.5 ft. radius
MATURE TREES - POST CONSTRUCTION CARE FOR 2019 THROUGH 2021
1. Irrigation
• Water every 2 weeks between May 1 and September 30 when the soil is dry.
• Use a trowel or soil probe to check the soil before and after watering.
• If there are no sprinklers nearby, set up soaker hoses in loose rings beneath the trees.
• Wet soil 12 inches deep to the area within the drip line.
• Allow the soil to partially dry out between applications.
• Cautions:
o Avoid soaking the trunks.
o Avoid over watering where turf or new landscape has been placed nearby
2. Mulch
• Use coarse organic mulch 4 to 6 inches deep to retain moisture and suppress weeds.
• Re-apply when mulch is less than 2-inches deep and/or the soil shows.
• Use arborist wood chips, 'Pacific garden mulch', or similar product. Medium or fine bark mulches
are not recommended.
• Cautions:
o Keep mulch off of the lower trunk and trunk flare.
o Fertilizer is not recommended at this time. Avoid high fertilization to adjacent turf.
Example
Do not cover the trunk
flare. Mulch can be
thicker at the outer edge.
Soaker hose can
overlap turf. Use as
many loops as
needed to cover area
under drip line.
Minimum 1-foot away
from the trunk, and
about 1-foot or less
between loops.
General Tree Protection Guidelines
By Urban Forestry Services, Inc.
2011-12
Page 1 of 3
General Tree Protection Guidelines
With Critical Root Zone Explanation Attachment
1. Responsibilities: These Guidelines pertain to any disturbance, use or activity within the Critical
Root Zone of any retained tree on this project. See attached Critical Root Zone Explanation
for reference. The owner’s arborist and general contractor shall meet onsite before any site
work begins, to review and designate the most appropriate methods to be used to protect the
retained trees during construction.
These guidelines apply to work provided by all contractors and sub-contractors on the project.
The project consulting arborist shall be contacted prior to any work that may need to enter the
tree protection fencing. Two days notice shall be provided to the project consulting arborist. A
proposed method for work shall be provided to the arborist. This method shall be reviewed by
the project consulting arborist and either approval and / or comments provided by the project
consulting arborist prior to commencing works within the tree protection area. He or she should
be notified within 8 hours should any injury occur to any protected tree or its larger roots
(greater than 2-inch diameter) so that appropriate assessment and/or treatment may be made.
2. Soil Disturbance: No soil disturbance shall take place before tree protection fences are
installed. All evaluated trees to be retained within these areas are clearly illustrated on the Site
Plan.
3. Designated Tree Removals: The owner’s arborist and contractor shall confirm on site which
trees are to be removed and those to be retained. Directional felling and removal of trees will
be completed with great care to avoid any damage to the trunks, limbs, and critical root zones
of the retained trees.
4. The Tree Protection Site Plan shows the recommended location of the Tree Protection Fence
(TPF). Immediately after the clearing limits and grading stakes are set in the field, the owner’s
arborist, during review and discussion with the contractor, will make a final determination on the
tree protection requirements depending on construction limits and impact on major roots and
soil condition. The arborist may adjust clearing limits in the field so that, in his/her opinion, tree
roots and soils are protected while necessary work can proceed.
5. The Tree Protection Fence (TPF) shall be installed along the clearing limits, with special
consideration of the Critical Root Zone (CRZ) of trees to be preserved. The CRZ of a tree is
generally described as an area equal to 1-foot radius for every 1-inch diameter of tree. For
example, a 10-inch diameter tree has a CRZ of 10-foot radius. Work within the CRZ may be
limited to hand work or alternate method of construction.
The Tree Protection Fence (TPF) shall be constructed with steel posts driven into the ground
with 6-ft. chain link fence attached. Upon consultation with the contractor, the arborist shall
determine the placement of the fence and the extent and method of clearing that may be done
General Tree Protection Guidelines
By Urban Forestry Services, Inc.
2011-12
Page 2 of 3
near preserved trees. Additional follow-up determinations may be required as work progresses
on the project. See attached Critical Root Zone Explanation.
No parking, storage, dumping, or burning of materials is allowed beyond the clearing limits or
within the Tree Protection Fence.
The TPF shall not be moved without authorization by the owner’s arborist or City arborist. The
TPF shall remain in place for the duration of the project.
Work within this area shall be reviewed with and approved by the owner’s arborist. Call Urban
Forestry Services, Inc. at 360-428-5810 with questions.
6. Silt Fence: If a silt fence is required to be installed within the Critical Root Zone of a retained
tree, the bottom of the silt fence shall not be buried in a trench, but instead, folded over and
placed flat on the ground. The flat portion of the silt fence shall be covered with gravel or soil
for anchorage.
7. CRZ over Hardscape: Where the Critical Root Zone (CRZ) includes an area covered by
hardscape, the TPF can be placed along the edge of the hardscape if and until it is removed.
After hardscape removal, the available CRZ should be backfilled with topsoil up to 6 inches
deep and protected with the TPF. Incorporation of topsoil into the existing sub-grade shall be
determined by the consulting arborist. Where applicable a specification for topsoil will be
provided or approved by Urban Forestry Services, Inc.
8. Tree Protection Signs shall be attached to the fence only and shall be shown as required on
the Site Plan. They should read “Protect Critical Root Zone (CRZ) of trees to be retained. No
soil disturbance, parking, storage, dumping, or burning of materials is allowed within the Tree
Protection Barrier. " Monetary Fines based on the appraised dollar value of the retained trees
may also be included on these signs. Telephone contact details for the project consulting
arborist should also be included in the sign.
9. Soil Protection within the Critical Root Zone (CRZ): Where vehicular access, temporary
work pad or storage pad is required within the CRZ of any preserved tree that is not protected
with hardscape, the soil shall be protected with 18” of woodchips and/or plywood or metal
sheets to protect from soil compaction and damage to roots of retained trees. A biodegradable
coir mat netting is recommended to be placed on the existing grade before woodchip placement
to protect the condition and confirm the location of the existing grade. The netting is a valuable
benchmark upon removal of the material within the CRZ.
10. Landscape Plans, Irrigation Design and Installation Details: Great care shall be exercised
when landscaping within the Critical Root Zone (CRZ) of any tree. Roots of preserved trees
and other vegetation shall not be damaged by planting or installation of irrigation lines The
owner’s arborist shall review the Landscape Plan for any potential design and tree preservation
conflicts and approve related irrigation and landscape installation activities within the CRZ of
retained trees. A proposed method for work shall be provided to and approved by the arborist.
11. Backfill and Grade Changes: The owner’s arborist will determine to what extent backfilling
may be allowed within the Critical Root Zone of a preserved tree, and if needed, the specific
General Tree Protection Guidelines
By Urban Forestry Services, Inc.
2011-12
Page 3 of 3
material which may be used. Grade cuts are usually more detrimental than grade filling within
the CRZ and should be reviewed by the arborist well in advance of construction.
12. Tree Maintenance and Pruning: Trees recommended for maintenance and approved by the
owner, shall be pruned for deadwood, low hanging limbs, and proper balance, as
recommended for safety, clearance or aesthetics. All pruning shall be done by an International
Society of Arboriculture Certified Arborist. ANSI A300 American Standards for Pruning shall be
used. Limbs of retained trees within 10 feet or less, of any power line, depending on power line
voltage, may only be pruned by a Utility Certified Arborist. This pruning must be coordinated
with the local power company, as they may prefer to provide this pruning.
13. Underground Utilities: Utility installation within the Critical Root Zone (CRZ) of any retained
tree shall be reviewed by the Project Consulting Arborist. A less root disturbing route or
minimal impact installation method of utility installation may be discussed and recommended
i.e. tunneling or trenchless excavation. Trenching through the Interior CRZ of a retained tree is
not usually allowed. See CRZ Explanation to differentiate between the Perimeter and
Interior CRZ. An Air spade and Vac., Truck may be required when utility installation is
mandatory near a retained tree or other methodology such as trenchless excavation.
14. Root Pruning: Required work may result in the cutting of roots of retained trees. Cutting roots
2” or greater should be avoided. Potential root pruning needs should be reviewed in advance
with the Project Consulting Arborist to minimize potential root fracturing and other damage.
Severed roots of retained trees shall be cut off cleanly with a sharp saw or pruning shears.
Applying pruning paint on trunk or root wounds is not recommended. Severed roots shall be
covered immediately after final pruning with moist soil or covered with mulch until covered with
soil. Excavation equipment operators shall take extreme care not to hook roots and pull them
back towards retained trees. In all cases, the excavator shall sit outside of the CRZ. Soil
excavation within the CRZ shall be under the direct supervision of the owner’s arborist.
15. Supplemental Tree Irrigation: If clearing is performed during the summer, supplemental watering
and/or mulching over the root systems within the Tree Protection Fencing of preserved trees may be
required by the owner’s arborist. The arborist should be notified of the proposed schedule for clearing
and grading work. Supplemental watering and mulching over the root systems of roots impacted or
stressed trees are strongly recommended to compensate for root loss and initiate new root growth.
Long periods of slow drip irrigation will be most effective. A large coil of soaker hose starting at least
18" from the trunk and covering the Interior Critical Root Zone area is recommended. Water once
per week and check soils for at least 12 inches infiltration. This work shall be under the direct
supervision of the owner’s arborist.
16. Additional Measures: Additional tree protection recommendations may be required and may be
specified in Urban Forestry Services, Inc. report(s).
17. Final Inspection: The owner’s arborist shall make a final site visit to report on retained tree condition
following completed work and shall report to the city to release the bond for the retained trees.
Tree Risk Assessment Level Descriptions
The tree risk assessment process is based on factors present at the time of assessment. Because trees are
living, growing things that change in size and condition over time, the tree assessment process must also
recognize and anticipate where and when future assessments should be performed. The Tree Risk Assessment
Qualification (TRAQ) training and methodology, developed and administered by the International Society of
Arboriculture is the best available methodology for tree risk assessment at this time. There are three levels of
assessment that may be considered and employed according to the expectations of the owner or manager,
conditions of the site and of the trees involved:
Level 1 Limited Visual Assessment: Includes a broad overview of an individual tree or group of trees near
specified targets, conducted to identify obvious defects or other conditions of concern. A limited visual
assessment typically focuses on identifying trees with imminent and/or probable likelihood of failure. Level 1
assessments do not always meet the criteria for a "risk assessment" if they do not include documented analysis
and evaluation of individual trees. This level is typically used for large populations of trees as a means to
quickly identify trees with imminent and/or probable likelihood of failure, at a specified schedule and/or
immediately after storms.
Level 1 assessments may be done as walk-by, drive-by or aerial patrols as requested by the tree owner or
manager. They may not provide enough information to develop risk mitigation recommendations. They can
help identify specific areas and/or trees for further inspection at Level 2 or 3. Trees found to require a Level 2
Basic Assessment are assessed, mapped and documented at the higher level at this time. Trees determined to
need a Level 3 Advanced Tree Assessment are documented and recommended for additional testing and
analysis. The owner is notified with options discussed.
Level 2 Basic Assessment: This is a detailed visual inspection of a tree and its surrounding site, and a synthesis
of the information collected. It requires that a tree risk assessor walk completely around the tree, looking at
the site, buttress roots, trunk, and branches. This basic assessment may include the use of simple tools to gain
additional information about the tree or defects. Our Level 2 Basic Assessment Trees are all typically tagged,
mapped and information gathered and retained for each tree. Risk mitigation recommendations may be
derived from this level of inspection. Defects found in a Level 2 Basic Tree Assessment may require a Level 3
assessment for further testing and analysis. The owner is notified with options discussed.
Level 3 Advanced Assessment: Advanced assessments are performed to provide more highly detailed
information about specific tree components, defects, targets or site conditions. An advanced assessment is
performed in conjunction with or after a Level 2 Basic Assessment if the assessor determines the need for
(requires) additional information. This level is particularly useful where there are concerns about trees that
may otherwise be of high value, or to obtain better information on how serious or extensive a particular defect
is. The Level 3 Advanced Tree assessment may include but not be limited to a root crown inspection with air
spade, Resistograph or Tomograph use to determine sound wood or an aerial crown inspection.
The preliminary Level 1 Limited Visual Assessment if requested would help determine where field
assessments at Level 2 and Level 3 will be needed.
ASSUMPTIONS AND LIMITING CONDITIONS
Urban Forestry Services, Inc.
15119 McLean Rd.
Mount Vernon, Washington 98273
1. Limitations of this Assessment
This Assessment is based on the circumstances and observations as they existed at the time
of the site inspection of the Client’s Property and the trees inspected by Urban Forestry
Services, Inc. and upon information provided by the Client to Urban Forestry Services, Inc.
The opinions in this Assessment are given based on observations made and using genera lly
accepted professional judgment, however, because trees and plants are living organisms and
subject to change, damage, and disease, the results, observations, recommendations, and
analysis took place and no guarantee, warranty, representation, or opinio n is offered or made
by Urban Forestry Services, Inc. as to the length of the validity of the results, observations,
recommendations, and analysis contained within this Assessment. As a result, the Client shall
not rely upon this Assessment, save and except for representing the circumstances and
observations, analysis, and recommendations that were made as at the date of such
inspections. It is recommended that the trees discussed in this Assessment should be re -
assessed periodically.
Urban Forestry Services, Inc. shall not be required to give testimony or to attend court by
reason of this report unless subsequent contractual arrangements are made, including
payment of an additional fee for such services as described in our fee schedule and contract
of engagement.
Sketches, diagrams, graphs, and photographs in this report, being intended as visual aids, are
not necessarily to scale and should not be construed as engineering or architectural reports or
surveys.
2. Reaction of Assessment
The Assessment carried out was restricted to the Property. No assessment of any other trees
or plants has been undertaken by Urban Forestry Services, Inc. Urban Forestry Services, Inc.
is not legally liable for any other trees or plants on the Property except those expressl y
discussed herein. The conclusions of this Assessment do not apply to any areas, trees,
plants, or any other property not covered or referenced in this Assessment.
3. Professional Responsibility
In carrying out this Assessment, Urban Forestry Services, Inc. and any Assessor appointed for
and on behalf of Urban Forestry Services, Inc. to perform and carry out the Assessment has
exercised a reasonable standard of care, skill, and diligence as would be customarily and
normally provided in carrying out this Assessment. The Assessment has been made using
accepted arboricultural techniques. These include a visual examination of each tree for
structural defects, scars, external indications of decay such as fungal fruiting bodies, evidence
of insect attack, discolored foliage, the condition of any visible root structures, the degree and
direction of lean (if any), the general condition of the tree(s) and the surrounding site, and the
current or planned proximity of property and people. Except where specifically n oted in the
Assessment, none of the trees examined on the property were dissected, cored, probed, or
climbed and detailed root crown examinations involving excavation were not undertaken.
While reasonable efforts have been made to ensure that the trees recommended for retention
are healthy, no guarantees are offered, or implied, that these trees, or all parts of them will
remain standing. It is professionally impossible to predict with absolute certainty the behavior
of any single tree or group of trees, or all their component parts, in all given circumstances.
Inevitably, a standing tree will always pose some risk. Most trees have the potential to fall,
lean, or otherwise pose a danger to property and persons in the event of adverse weather
conditions, and this risk can only be eliminated if the tree is removed.
Without limiting the foregoing, no liability is assumed by Urban Forestry Services, Inc. or its
directors, officers, employers, contractors, agents, or Assessors for:
• any legal description provided with respect to the Property;
• issues of title and or ownership respect to the Property;
• the accuracy of the Property line locations or boundaries with respect to the Property; and
• the accuracy of any other information provided to Urban Forestry Ser vices, Inc. by the
Client or third parties;
• any consequential loss, injury, or damages suffered by the Client or any third parties,
including but not limited to replacement costs, loss of use, earnings, and business
interruption; and
• the unauthorized distribution of the Assessment.
The total monetary amount of all claims or causes of action the Client may have as against
Urban Forestry Services, Inc. including but not limited to claims for negligence, negligent
misrepresentation, and breach of contract, shall be strictly limited to solely to the total amount
of fees paid by the Client to Urban Forestry Services, Inc. pursuant to the Contract for
Services as dated for which this Assessment was carried out. Further, under no circumstance
may any claims be initiated or commenced by the Client against Urban Forestry Services, Inc.
or any of its directors, officers, employees, contractors, agents, or Assessors, in contract or in
tort, more than 12 months after the date of this Assessment.
4. Third Party Liability
This Assessment was prepared by Urban Forestry Services, Inc. exclusively for the Client.
The contents reflect Urban Forestry Services, Inc. best assessment of the trees and plants on
the Property in light of the information available to it at the time of preparation of this
Assessment. Any use which a third party makes of this Assessment, or any reliance on or
decisions made based upon this Assessment, are made at the sole risk of any such third
parties. Urban Forestry Services, Inc. accepts no responsibility for any damages or loss
suffered by any third party or by the Client as a result of decisions made or actions based
upon the use of reliance of this Assessment by any such party.
5. General
Any plans and/or illustrations in this Assessment are included only to help the Client visualize
the issues in this Assessment and shall not be relied upon for any other purpose.
This report and any values expressed herein represent the opinion of Urban Forestry
Services, Inc. Our fee is in no way contingent upon any specified value, a result or
occurrence of a subsequent event, nor upon any finding reported.
The Assessment report shall be considered as a whole, no sections are severable, and the
Assessment shall be considered incomplete if any pages are missing. The right is reserved to
adjust tree valuations, if additional relevant information is made available. This Assessment is
for the exclusive use of the Client.