HomeMy WebLinkAboutEx09_Arborist Report
4815 Center Street
Tacoma, WA 98409-2319
(253) 474-9449 / sittshill.com
Brent K. Leslie, P.E., S.E.
Kathy A. Hargrave, P.E.
Larry G. Lindell, P.E., S.E.
Michael A. McEvilly, P.L.S.
Andrew J. Boileau, P.E., S.E.
David C. Boileau, AIA
Civil | Structural | Survey
July 21st, 2023
Construction Contractors, Inc.
1404 SW Grady Way
Renton, Washington 98055
TO: Mr. Drew Beebe
SUBJECT: LANDSCAPE ARCHITECT’S ARBORIST REPORT FOR PROPOSED OFFICE & SHOP
BUILDING SITE-1404 SOUTHWEST GRADY WAY, RENTON, WA 98005
Dear Drew,
This letter is being written to satisfy the City of Renton’s requirement for an Arborist Report for the
proposed construction of a new Office and Shop Building at your 1404 SW Grady Way site.
2 trees are currently proposed for removal at the project site. Both are in good condition. These trees
are both required to be removed in conjunction with proposed onsite improvements and a relocated
driveway approach and underground utility installation within the right-of-way.
On-site Tree Requirements
One onsite tree, an 11-inch DBH Pine, is proposed to be removed for construction of a vehicular
turnaround area and resultant changes in finish grade (a 3 foot difference between existing and
proposed grades). This tree is located adjacent to east side of the existing site driveway entrance.
Renton Municipal Code H,1.,e., ii-Replacement Quantity and Standards indicates that when the minimum
number of protected trees cannot be retained, replacement trees with at least a two-inch (2”) caliper,
or evergreen trees at least six feet (6’) tall, shall be planted based on the tree credit value of each
protected tree. It further indicates that replacement trees shall not contribute to the total credits
required pursuant to subsection H1b of that Section.
The tree credit value of the 11-inch Pine is 5 tree credits. Tree credit value for new large species
replacement trees according to the tree credit chart is 2 tree credits. 5/2=2.5 rounded up is 3 tree
credits. These 3 tree credits cannot contribute to the total credits required for the site (using large
species trees).
Renton Municipal Code 4-4-130, H,1, a requires a minimum rate of thirty (30) credits per net acre. The
site is 0.62 acres requiring a minimum of 19 tree credits. Using new large species trees (2 tree credits
each) the site will require 10 trees.
The total onsite tree requirement for the site using large species trees is 13 trees. See the attached
conceptual landscape plan for the proposed locations.
Street Tree Requirements
One street tree, a 5-inch DBH Maple, is proposed to be removed for construction of new driveway
approach and fire utility. This tree is centrally located along the SW Grady Way street frontage.
CONSTRUCTION CONTRACTORS, INC.
July 21st, 2023
Page 2 of 2
Replacement of street trees are on a one to one basis. One total new replacement Maple street tree is
proposed within the SW Grady Way right-of-way.
Tree retention/removal plans are attached reflecting the above including impacted existing significant
trees, descriptions, notes and completed Tree Retention Worksheet. These plans accompany the SEPA
permit documentation package for supporting calculations. We have also furnished a conceptual
landscaping plan, which includes trees, shrubs, and groundcover to be installed throughout the
proposed project sites.
Please feel free to contact our office with any additional questions or comments regarding this project.
Sincerely,
Raymond J. Johnson, PLA WA License #449
Senior Project Manager
O:\19800\19871\Permits and Applications\Arborist_Report\ TR Arborist Report.docx