HomeMy WebLinkAboutExhibitsProject Narrative —Trojan Lithograph
Project Name: Tree Removal
Remove 14 trees adjacent to the building in a narrow parking strip within the Shoreline Buffer Zone of
Spring Brook Creek. None of the trees are landmark size. Trees are in contact with the structure and in
places are causing damage. Poor overhead clearance for vehicle access has also been an issue. The
trees are an unsuitable species for the location and outgrowing the space. It is the recommendation of
a certified arborist to remove them.
An equal number of trees will be planted will be planted as a replacement as recommended in the
attached report for Tree Solutions Consulting Arborists.
Anticipated dates of work: removal will be done as soon as a permit is received and landscaping
company is available. Replanting will be done as soon after as possible. Preferably project will be
completed by June 1, 2017.
The use of the property will not change.
Estimated project cost is:
The trees to be remove are approximately 75 feet from the Ordinary High Water Mark.
The proposed new plantings are approximately 40 feet from the Ordinary High Water Mark.
The nature of the existing shoreline is a naturalized, high bank for a creek.
Tree
Solutions nc
Consulting Arborists
Arborist Report
TO: Sandy Burns, TrojanLitho
SITE: 800 SW 27th St., Renton, WA 98057
RE: Assessment of trees next to building
DATE: February 24, 2017
PROJECT ARBORIST: Sean Dugan , Registered Consulting Arborist # 457
ISA Board Certified Master Arborist #PN- 5459B
ISA Qualified Tree Risk Assessor
REVIEWED BY: Katie Hogan,
ISA Certified Arborist #PN- 8078A
ISA Qualified Tree Risk Assessor
SeattIC Portland - Bend
Project No. TS - 5767
Summary
Fourteen (14) trees are adjacent to a building in a narrow planting strip. None of the trees are of
Landmark size. Trees are in contact with the structure and in places causing damage. Poor overhead
clearance for vehicle access has also been an issue. The trees are an unsuitable species for the location
and are outgrowing the space. I recommend removal of the trees.
Assignment & Scope of Report
This report outlines the site inspection by Sean Dugan of Tree Solutions Inc, on February 1, 2017. 1 was
asked to visit the job site and assess a row of trees located along the west side of a building. I was asked
to provide a formal report including findings and management recommendations. Sandy Burns, the EHS
Manager of the property, requested these services.
The tree size, species, health and structural condition and related notes and recommendations for each
tree can be found in Figure 1: Tree Inventory. A site map with tree locations can be found in Figure 2:
Site May. Photographs, Glossary and References follow the site map. Limits of assignment can be found
in Appendix A. Methods can be found in Appendix B. Additional assumptions and limiting conditions
can be found in Appendix C.
Observations and Discussion
The Site and History
The 574,855 square foot (13.2 acre) site contains an industrial warehouse and parking lot. The site is
adjacent to the Black River on its east border. The subject trees are planted along the east side of the
building in a four foot wide planting strip (see Photo 1). Soils in the strip are shallow and compacted.
2940 Westlake Ave N (Suite 200) • Seattle, WA 98109 • Phone 206.528.4670
www.treesolutions.net
Arborist Report — TrojanLitho, Renton, WA
February 24, 2017
pg. 2 of 11
The Trees
I inspected 14 'Bowhall' red maple (Acer rubrum'Bowhall') trees (see Figure 2). The trees are all in good
health and structural condition (see Figure 1). The trees range in size from 4.1 to 11.3 inches in diameter
and are 25 to 35 feet tall. None of the trees qualify as Landmark Trees (greater than 30" DSH).
The trees have been previously topped, and have grown approximately 4 to 10 feet since the topping
(see Photo 2). Many of the trees have a buried root flare with potential girdling roots. There is minor
damage to surface roots. The trees are touching the building fagade and in places are pushing against
and damaging window flashing (see Photos 3 & 4).
Fiaure 1: Tree Inventory
Tree No.
Common Name
Botanical Name
DS
H *
General Health
General
Structure
1
Bowhall red maple
Acerrubrum'Bowhall'
11.
2
Good
Good
2
Bowhall red maple
Acerrubrum'Bowhall'
8.0
Good
Good
3
Bowhall red maple
Acerrubrum'Bowhall'
7.4
Good
Good
4
Bowhall red maple
Acerrubrum'Bowhall'
6.4
Good
Good
5
Bowhall red maple
Acerrubrum'Bowhall'
5.7
Good
Good
6
Bowhall red maple
Acerrubrum'Bowhall'
5.5
Good
Good
7
Bowhall red maple
Acerrubrum'Bowhall'
8.3
Good
Good
8
Bowhall red maple
Acerrubrum'Bowhall'
9.2
Good
Good
9
Bowhall red maple
Acer rubrum'Bowhall'
6.9
Good
Good
30
Bowhall red maple
Acerrubrum'Bowhall'
7.8
Good
Good
11
Bowhall red maple
Acer rubrum'Bowhall'
4.9
Good
Good
12
Bowhall red maple
Acerrubrum'Bowhall'
4.1
Good
Good
13
Bowhall red maple
Acer rubrum'Bowhall'
5.3
Good
Good
14
Bowhall red maple
Acer rubrum'Bowhall'
10.
3
Good
Good
*Diameter at Standard Height (inches)
2940 Westlake AveN #200 Seattle, WA 98109 - Phone 206.528 4670
www.treesoIutions. net
Arborist Report—TrojanLitho, Renton, WA
February 24, 2017 pg. 3 of 11
While the trees exhibit good health and structure, they are not ideal for the space. The trees have
outgrown the space requiring maintenance to prune them away from the building and provide clearance
for vehicles. This maintenance needs to occur on a regular basis and will likely do so in perpetuity.
Roots from the trees have caused damage to the base of windows and flashing down the side of the
building. The roots are pushing up against the curb and cracks are visible in several locations. The tree
species has the ability of having a trunk over 18 inches in diameter and can grow to a height over 50 feet
tall. The narrow planting strip is not a suitable location for the species. In my opinion, the trees should
be removed
If a replacement tree is desired/required, it is my opinion that this is not an appropriate space. The
narrow planting strip would be better suited with shrubs or short columnar tree species. There are
many alternative locations nearby, to the east, that can support the development of larger and healthier
trees.
Recommendations
• Obtain a city permit prior to the commencement of tree removal work.
• Remove the 14 trees planted along the east side of the building.
• If replanting the space is desired, replant with a different species of tree or shrub that will
remain of appropriate size for the planting area.
o Alternatively, plant east of the asphalt path to the east of the building.
2940 Westlake Ave N 4200 - Seattle, WA 98109 Phone 206.528.4670
www.treesoIutions. net
Arborist Report—Trojan Litho, Renton, WA
February 24, 2017
Site Map
2940 Westlake Ave N #200 • Seattle, WA 98109 • Phone 206.528.4670
www.treesolutionS.net
pg. 4 of 11
Arborist Report—TrojanLitho, Renton, WA
February 24, 2017
Photographs
Tree Solutions, Inc.)
height of the building by approximately four to seven feet.
top cuts (source: Tree Solutions, Inc.)
pg. 5 of 11
rrow planting strip (source:
o have been topped below the
The yellow arrows show the location of a single tree's
2940 Westlake Ave N #200 - Seattle, WA 98109 - Phone 206.525.4670
www.treesoIutions.net
Arborist Report — TrojanLitho, Renton, WA
February 24, 2017
pg. 6 of 11
Photo 3: View looking to the north. The canopy of the tree has become overgrown and is In contact with the
building. Branches on the west side of the tree have been damaged from vehicles passing below (source: Tree
Solutions, Inc.)
_amageflashing below
windows. Roots are also pushing up against the curb causing sections to crack. The trees are outgrowing the
available planting space (source: Tree Solutions, Inc.)
2940 Westlake Ave N #200 • Seattle, WA 98109 • Phone 206.528.4670
www.treesolut!ons.net
Arborist Report — TrojanLitho, Renton, WA
February 24, 2017
Glossary
pg. 7 of 11
ANSI A300: American National Standards Institute (ANSI) standards for tree care
basic assessment: detailed visual inspection of a tree and surrounding site that may include the use of
simple tools. It requires that a tree risk assessor walk completely around the tree trunk looking at
the site, aboveground roots, trunk, and branches (ISA 2013)
crown: the aboveground portions of a tree (Lilly 2001)
DBH or DSH: diameter at breast or standard height; the diameter of the trunk measured 54 inches (4.5
feet) above grade (Matheny et al. 1998)
deciduous: tree or other plant that loses its leaves sometime during the year and stays leafless
generally during the cold season (Lilly 2001)
ISA: International Society of Arboriculture
landscape function: the environmental, aesthetic, or architectural functions that a plant can have (Lilly
2001)
mitigation: process of reducing damages or risk (Lilly 2001)
owner/manager: the person or entity responsible for tree management or the controlling authority
that regulates tree management (ISA 2013)
significant size: a tree measuring 6" DSH or greater
structural defects: flaws, decay, or other faults in the trunk, branches, or root collar of a tree,
whichmay lead to failure (Lilly 2001)
Visual Tree Assessment (VTA): method of evaluating structural defects and stability in trees by noting
the pattern of growth. Developed by Claus Mattheck (Harris, et al 1999)
2940 Westlake Ave N 4200 - Seattle, WA 98109 - Phone 206.528.4670
www.treesoIutions. net
Arborist Report—Trojan Litho, Renton, WA
February 24, 2017
References
pg. 8 of 11
ANSI A300 (Part 1) —2008 American National Standards Institute. American National Standard for Tree
Care Operations: Tree. Shrub. and Other Woody Plant Maintenance: Standard Practices (Pruning).
New York: Tree Care Industry Association, 2008.
Dunster & Associates Environmental Consultants Ltd. Assessin¢ Trees in Urban Areas and the Urban -
Rural Interface, US Release 1.0. Silverton: Pacific Northwest Chapter ISA, 2006.
Lilly, Sharon. Arborists' Certification Study Guide. Champaign, IL: The International Society of
Arboriculture, 2001.
Matheny, Nelda and James R. Clark. Trees and Development: A Technical Guide to Preservation of Trees
During Land Development. Champaign, IL: International Society of Arboriculture, 1998.
Mattheck, Claus and Helge Breloer, The Body Language of Trees.: A Handbook for Failure Analysis.
London: HMSO, 1994.
2940 Westlake Ave N 4200 - Seattle, WA 98109 Phone 206.528.4670
w w w.treesolutions.net
Arborist Report — TrojanLitho, Renton, WA
February 24, 2017
Appendix A - Limits of Assignment
pg. 9 of 11
Unless stated otherwise: 1) information contained in this report covers only those trees that were
examined and reflects the condition of those trees at the time of inspection; and 2) the inspection is
limited to visual examination of the subject trees without dissection, excavation, probing, climbing, or
coring unless explicitly specified. There is no warranty or guarantee, expressed or implied, that problems
or deficiencies of the subject trees may not arise in the future.
Tree Solutions did not review any reports or perform any tests related to the soil located on the subject
property unless outlined in the scope of services. Tree Solutions staff are not and do not claim to be soils
experts. An independent inventory and evaluation of the soils on site should be obtained by a qualified
professional if an additional understanding of site characteristics is needed to make an informed
decision.
2940 Westlake Ave N #200 Seattle, WA 98109 - Phone 206.528.4670
w w w. t r e e s o l u t i o n s. n et
Arborist Report—TrojanLitho, Renton, WA
February 24, 2017
Appendix B - Methods
pg. 10 of 11
I evaluated tree health and structure utilizing visual tree assessment (VTA) methods. The basis behind
VTA is the identification of symptoms, which trees produce in reaction to weak spots or areas of
mechanical stress. Trees react to mechanical and physiological stresses by growing more vigorously to
re -enforce weak areas, while depriving less stressed parts (Mattheck & Breloer 1994). Understanding
uniform stress allows me to make informed judgments about the condition of a tree.
I measured the diameter of each tree at 54 inches above grade, diameter at standard height (DSH).
Where a tree had multiple stems, I measured each stem individually at standard height and determined
a single -stem equivalent diameter by using the method outlined in the Guide for Plant Appraisal, 9th
Edition published by the Council of Tree and Landscape Appraisers.
Tree health considers crown indicators including foliar density, size, color, stem shoot extensions, decay,
and damage. We have adapted our ratings based on the Purdue University Extension Formula Values for
health condition. These values are a general representation used to assist in arborists in assigning ratings.
Tree health needs to be evaluated on an individual basis and may not always fall entirely into a single
category, however, a single condition rating must be assigned.
Excellent - Perfect specimen with excellent form and vigor, well-balanced crown. Normal to exceeding
shoot length on new growth. Leaf size and color normal. Trunk is sound and solid. Root zone undisturbed.
No apparent pest problems. Long safe useful life expectancy for the species.
Good - Imperfect canopy density in few parts of the tree, up to 10% of the canopy. Normal to less than ''%
typical growth rate of shoots and minor deficiency in typical leaf development. Few pest issues or damage,
and if they exist they are controllable or tree is reacting appropriately. Normal branch and stem
development with healthy growth. Safe useful life expectancy typical for the species.
Fair - Crown decline and dieback up to 30% of the canopy. Leaf color is somewhat chlorotic/necrotic with
smaller leaves and "off' coloration. Shoot extensions indicate some stunting and stressed growing
conditions. Stress cone crop clearly visible. Obvious signs of pest problems contributing to lesser
condition, control might be possible. Some decay areas found in main stem and branches. Below average
safe useful life expectancy
Poor - Lacking full crown, more than 50% decline and dieback, especially affecting larger branches.
Stunting of shoots is obvious with little evidence of growth on smaller stems. Leaf size and color reveals
overall stress in the plant. Insect ordisease infestation may be severe and uncontrollable. Extensive decay
or hollows in branches and trunk. Short safe useful life expectancy.
Tree health condition ratings have been adapted from the Purdue University Extension bulletin FNR-473-
W - Tree Appraisal.
2940 Westlake Ave N #200 Seattle, WA 98109 Phone 206.528.4670
w w w. t r e e s o l u t i o n s. n et
Arborist Report — TrojanUtho, Renton, WA
February 24, 2017 pg. 11 of 11
Appendix C - Assumptions & Limiting Conditions
1. Consultant assumes that any legal description provided to Consultant is correct and that title to
property is good and marketable. Consultant assumes no responsibility for legal matters. Consultant
assumes all property appraised or evaluated is free and clear, and is under responsible ownership and
competent management.
2. Consultant assumes that the property and its use do not violate applicable codes, ordinances, statutes
or regulations.
3. Although Consultant has taken care to obtain all information from reliable sources and to verify the
data insofar as possible, Consultant does not guarantee and is not responsible for the accuracy of
information provided by others.
4. Client may not require Consultant to testify or attend court by reason of any report unless mutually
satisfactory contractual arrangements are made, including payment of an additional fee for such
Services as described in the Consulting Arborist Agreement.
5. Unless otherwise required by law, possession of this report does not imply right of publication or use
for any purpose by any person other than the person to whom it is addressed, without the prior
express written consent of the Consultant.
6. Unless otherwise required by law, no part of this report shall be conveyed by any person, including
the Client, the public through advertising, public relations, news, sales or other media without the
Consultant's prior express written consent.
This report and any values expressed herein represent the opinion of the Consultant, and the
Consultant's fee is in no way contingent upon the reporting of a specific value, a stipulated result, the
occurrence of a subsequent event or upon any finding to be reported.
8. All photographs included in this report were taken by Tree Solutions Inc. during the documented site
visit, unless otherwise noted.
9. Sketches, drawings 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. The
reproduction of any information generated by architects, engineers or other consultants and any
sketches, drawings or photographs is for the express purpose of coordination and ease of reference
only. Inclusion of such information on any drawings or other documents does not constitute a
representation by Consultant as to the sufficiency or accuracy of the information.
10. Unless otherwise agreed, (1) information contained in this report covers only the items examined and
reflects the condition of the those items at the time of inspection; and (2) the inspection is limited to
visual examination of accessible items without dissection, excavation, probing, climbing, or coring.
Consultant makes no warranty or guarantee, express or implied, that the problems or deficiencies of
the plans or property in question may not arise in the future.
11. Loss or alteration of any part of this Agreement invalidates the entire report.
2940 Westlake Ave N #20Seattle, WA 98109 Phone 206.528.4670
www.treesol utions. net
CONFLUENCE
ENVIRONMENTAL COMPANY
To: Sean Dugan, Tree Solutions Inc.
From: Kerrie McArthur, PWS Grant Novak
Date: July 11, 2017
Re: 800 SW 27th Street Stream Buffer Functional Assessment
Enclosures: Planting Plan
Confluence Environmental Company (Confluence) has prepared this assessment on behalf of
Tree Solutions Inc. (Tree Solutions) to define the functions and values provided by the current
vegetation community within the existing stream and wetland buffers and describe how the
proposed project is anticipated to result in no net loss of buffer functions or values.
1.0 PROPOSED PROJECT
The proposed project site is located at 800 SW 27th Street, Renton, Washington. The 13.2 -acre
site includes an industrial warehouse and parking lot adjacent to the Black River. The river is
adjacent to the eastern property line and a wetland is located on the other side of the river (City
of Renton 2017) (Figure 1). Both wetlands and streams are defined as regulated critical areas by
the City of Renton and, as such, have regulatory buffers with associated development
requirements. Both the wetland and stream buffers extend onto the property and include the
proposed planting areas (Figure 1).
On the property, buffer vegetation is limited to non-native vegetation near the entrance, along
the side of the building, and in the parking lot strips. In 2017 Tree Solutions evaluated 14 trees
along the side of the building (Tree Solutions 2017a). Tree Solutions recommended removing
the trees, citing the following issues in their evaluation:
■ While the trees exhibited good health and structure, they were not ideal for the space.
Since the tree species planted adjacent to the building may grow to over 18 inches in
diameter and over 50 feet tall, it was determined the narrow planting strip is not a
suitable location for the species.
■ The trees have outgrown the space, requiring maintenance to prune them away from the
building and provide clearance for vehicles. This maintenance needs to occur on a
regular basis and would likely be required in perpetuity if the trees remain.
146 N Canal St, Suite 111 . Seattle, *A 98103 ■ www confenv com
Sean Dugan, Tree Solutions Inc.
July 11, 2017
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Figure 1 Project area with mapped critical areas (Tree Solutions 2017a).
Tree Solutions observed tree roots causing damage to the base of windows and flashing
down the side of the building. The roots were pushing up against the curb and cracks
and were visible in several locations.
Since the trees needing to be removed are within a stream and wetland buffer, the tree removal
necessitates installing new plants and a functional assessment to demonstrate that the proposed
plant installation results in no net loss of functions or values.
2.0 FUNCTIONAL ASSESSMENT
This section describes the existing buffer conditions as well as conditions that would be
anticipated if the proposed planting plan is implemented. Additionally, this section describes
how the proposed planting plan is anticipated to result in the same level of function or value
when compared to existing conditions. Buffers provide numerous functions and the values of
these functions to human society depend on a complex set of relationships between the critical
area (i.e., stream and wetland) and the buffer.
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Figure 1 Project area with mapped critical areas (Tree Solutions 2017a).
Tree Solutions observed tree roots causing damage to the base of windows and flashing
down the side of the building. The roots were pushing up against the curb and cracks
and were visible in several locations.
Since the trees needing to be removed are within a stream and wetland buffer, the tree removal
necessitates installing new plants and a functional assessment to demonstrate that the proposed
plant installation results in no net loss of functions or values.
2.0 FUNCTIONAL ASSESSMENT
This section describes the existing buffer conditions as well as conditions that would be
anticipated if the proposed planting plan is implemented. Additionally, this section describes
how the proposed planting plan is anticipated to result in the same level of function or value
when compared to existing conditions. Buffers provide numerous functions and the values of
these functions to human society depend on a complex set of relationships between the critical
area (i.e., stream and wetland) and the buffer.
www.confenv. com page 2 of 6
Sean Dugan, Tree Solutions Inc.
July 11, 2017
2.1 Methods
lb 1
CONFLUENCE
Buffer functions were evaluated based on existing and proposed conditions to provide a
comparison and to determine if there is or is not a net loss of function. The following four
functions were evaluated under this functional assessment because these functions are directly
affected by the proposed planting plan.
• Vegetative Structure
• Vegetation Species Diversity
• Presence of Native Vegetation
• Water Quality
2.2 Existing Buffer Conditions
As stated above, and described in the arborist's report (Tree Solutions 2017a), vegetation along
the building consists mostly of non-native trees. Some shrubs and ground cover are also
present. The parking lot strip where planting of native trees and shrubs is proposed is
predominantly grassy lawn.
2.2.1 Existing Buffer Functions
The following sections describe the existing buffer functions evaluated for this assessment.
Vegetative Structure
Currently, the vegetated portions of the wetland and stream buffers on the property provide
limited vegetative structure. While the existing vegetated areas are primarily mono -specific
stands of non-native vegetation, the existing mature trees provide perching and some nesting
opportunities for tree -nesting birds, resulting in a moderate function for vegetative structure.
However, the maintained lawn area results in a low -function condition for vegetative structure.
Vegetation Species Diversity
Currently, the vegetated portions of the wetland and stream buffers on the property provide
limited vegetative species diversity. The existing vegetation is a mono -specific stand of non-
native trees or maintained lawn. The lack of species diversity results in a low -functioning
condition.
Presence of Native Vegetation
The vegetation proposed for removal is non-native. Vegetative communities with little to no
native vegetation are considered to be low functioning.
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Sean Dugan, Tree Solutions Inc.
%V
July 11, 2017 CONFLUENCE
Water Quality
Additionally, the existing vegetation provides little water quality function. The bare ground
and maintained lawn do not contain the vegetative structure needed to slow water velocities or
provide filtration. The lack of vegetative structure and maintained lawn are considered to
provide low water quality functions.
2.2.2 Values
The City of Renton Municipal Code (RMC) 4-3-050 requires that planting plans located within
stream and wetland buffer must use native vegetation.
Native vegetation is considered to have a higher ecological value than non-native vegetation.
Since the vegetation proposed for replacement in the planting plan is non-native, the value of
these plants is considered to be low.
2.3 Proposed Planting Plan
Implementation of the proposed planting plan would result in the removal of 14 trees along the
east side of the building. The trees would be replaced with a mix of 19 native shrubs and trees
(Tree Solutions 2017b). The proposed planting plan replaces the trees removed at a ratio greater
than 1:1. The proposed planting plan is attached.
2.3.1 Proposed Buffer Functions
The following sections describe the buffer functions evaluated for this assessment once the
proposed planting plan is implemented.
Vegetative Structure
The proposed planting plan would decrease the vegetative structure adjacent to the building by
removing the trees. However, the proposed planting plan would also increase the vegetative
structure in the lawn area. Thus, there would be no change in this function's condition.
It is important to note that most of the trees and shrubs would be planted within a parking lot
strip located along the eastern portion of the property, which is closer to the stream and
wetland edge. Wildlife are likely to benefit more from increased vegetative structure and a
native plant community closer to the stream and wetland than if these plants were installed
along the building. In addition, by installing most of the plants, and all the trees, within the
parking lot strip, damage to the building will not occur.
Vegetation Species Diversity
As shown on the proposed planting plan, a mix of five different species of native trees and
shrubs is proposed. One species of non-native tree will be removed. Implementing the
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Sean Dugan, Tree Solutions Inc.
July 11, 2017
CONFLUENCE
111 K11..,1 V I it ( 11101111
proposed planting plan will increase species diversity. Thus, implementing planting plan
would increase this function from a low to moderate condition.
Presence of Native Vegetation
As stated above and shown on the proposed planting plan, all species proposed for planting are
native. Thus, implementing the planting plan would increase this function from a low to
moderate condition.
Water Quality
Planting a mixture of trees and shrubs in the parking lot strip will also increase the vegetative
structure needed to slow runoff velocities and increase filtration. Thus, implementing the
planting plan would increase this function from a low condition to a moderate condition.
Table 1 summarizes the functions of the existing and proposed buffers.
Table 1 Buffer Assessment Summary
2.3.1 Values
By replacing non-native species with native species, values are improved, as native vegetation
has been deemed to have a higher ecological value than non-native vegetation (City of Renton
Municipal Code 4-3-050).
In summary, the proposed tree removal and planting of native vegetation would result in no
net loss of function or value of the on-site buffer. In fact, replacing non-native plants with native
plants is expected to increase functions and value.
www.confenv. com page 5 of 6
Existing
ProposedFunction
Bu ffer Quality
Buffer Quality
Functional
While the project would remove existing mature trees, the proposed
planting plan will increase the vegetative structure by planting a
Vegetative Structure
Low/Moderate
Low/Moderate
mixture of trees and shrubs on site compared to current conditions.
Once planted trees mature, vegetative structure is expected to be
nater than current conditions.
Vegetation Species
The proposed planting plan will increase the number of species on
Diversity
Low
Moderate
site compared to current conditions by removing t species of tree
and re lantin w th 5 species of trees and shrubs.
Presence of Native
Low
Moderate
The proposed planting plan will increase the number of native
Vegetation
species on site compared to current conditions.
Water Quality
Low
Moderate
The proposed plan will increase the structure needed to slow runoff
velocities and increase filtration.
2.3.1 Values
By replacing non-native species with native species, values are improved, as native vegetation
has been deemed to have a higher ecological value than non-native vegetation (City of Renton
Municipal Code 4-3-050).
In summary, the proposed tree removal and planting of native vegetation would result in no
net loss of function or value of the on-site buffer. In fact, replacing non-native plants with native
plants is expected to increase functions and value.
www.confenv. com page 5 of 6
Sean Dugan, Tree Solutions Inc.
July 11, 2017 CONFLUENCE
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3.0 REFERENCES
Tree Solutions (Tree Solutions Inc.). 2017a. Arborist Report for 800 SW 2711 Street, Renton,
Washington. Prepared for TrojanLitho, Renton, Washington, by Tree Solutions Inc., Seattle,
Washington.
Tree Solutions (Tree Solutions Inc.). 2017b. Planting Plan for 800 SW 2711 Street, Renton,
Washington. Prepared for TrojanLitho, Renton, Washington, by Tree Solutions Inc., Seattle,
Washington.
1175.0011800 SW 27m Fund Assessment.doc
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