HomeMy WebLinkAboutD_Shoreline_Management_Permit_Report_180711.pdfDEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
PLANNING DIVISION
SHORELINE MANAGEMENT ACT OF 1971
PERMIT FOR SHORELINE MANAGEMENT
EVALUATION FORM & DECISION
DATE OF PERMIT ISSUANCE: July 11, 2018
LAND USE ACTION FILE NO.: LUA17-000810, SM, CAR
DATE RECEIVED: November 28, 2017
DATE OF PUBLIC NOTICE: December 8, 2017
Pursuant to Chapter 90.58 RCW, staff recommends that the City of Renton grant a Shoreline Substantial
Development Permit. This action is proposed on the following application:
PROJECT NAME: I-405, Tukwila to Renton Improvement Project, Stage 3
PROJECT MANAGER: Clark H. Close, Senior Planner
OWNER/APPLICANT: Linda J. Cooley, WSDOT / 600 108th Ave NE Suite 405, Bellevue,
WA 98004
CONTACT: Kimberly Toal, I-405 Team / 600 108th Ave NE Suite 900,
Bellevue, WA 98004
PROJECT LOCATION: I-405, Tukwila to Renton Improvement Project / Project address:
I-405 MP 0.0 to MP 4.0, Cedar River Crossing, Renton, WA 98057
LEGAL DESCRIPTION:
(King County Assessor)
N/A
SEC-TWN-R: S. 17-T. 23N.-R. 5E. W.M.
WITHIN THE SHORELINES OF: Cedar River Reaches (CR-B and CR-C)
APPLICABLE MASTER PROGRAM: City of Renton
PROPOSAL DESCRIPTION: The applicant, Washington State Department of Transportation
(WSDOT) Northwest Region, is requesting a Shoreline Substantial Development Permit and Critical Areas Permit
for the I-405, Tukwila to Renton Improvement Project, Stage 3. The Project is designed to reduce congestion and
improve safety performance along one of the state’s most congested sections of highway. The Project includes
roadway, bridge and trail realignment work within the Shoreline High Intensity and Shoreline Urban Conservancy
environment at Cedar River, Reach B and C. The west side of the southbound I-405 lanes north of SR 169 would
be widened to accommodate an additional lane in each direction. The total riparian impacts, on either side of
the river, would amount to roughly 6,000 square feet. The Cedar River Bridge is located at Latitude 47°28'50.91"N
and Longitude 122°11'59.29"W near I-405, Exit 4.
Much of the property, within the Cedar River project area, is currently within WSDOT right-of-way (ROW). The
closest bridge pier would be roughly 30 feet landward of the ordinary high-water mark (OHWM) on the south
bank. Minor offsite improvements may include pavement markings, drainage improvements, permanent signing,
illumination, intelligent transportation systems and ramp metering, barriers, and tolling gantries. Construction
work is anticipated to start in 2019 and the project is expected to open to traffic in 2024. The project would use
the design-build project delivery method, the proposed plan does not require adding fill materials within the
Cedar River floodplain. Disturbed areas are to be restored to the existing grade. There may be minor amounts of
fill (approximately 100 cubic yards) in some locations associated with final grading. I-405 bridge widening and
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 2 of 27
relocation work is part of the larger I-405 Renton to Bellevue Express Toll Lanes Project for which the total cost
is estimated at $890 million. The Tukwila to Renton Improvement Project, from I-5 to SR 169, has an estimated
construction cost is $308 million.
The proposed work area is part of a complex of multiple transportation crossings that include the Houser Way
bridge and a BNSF bridge to the west of the I-405 north and southbound lanes. Land use and ownership adjacent
to the I-405 corridor includes Renton Old City Hall on the south bank and Liberty Park and Cedar River Park on
the north bank. The subject site area along I-405, which is not within WSDOT ROW, has residential, commercial,
and industrial zoning. The Cedar River area improvements are located within the following Critical Areas:
floodway and 100-year Special Flood Hazard Area (FEMA Zone AE), Cedar River Regulated Shoreline Reaches B
and C, high seismic hazard area, moderate landslide hazard area, regulated slopes, and Wellhead Protection Area
Zones 1 and 2. Many of the potential impacts to critical areas would be avoided entirely. Only minor fill and
excavation is planned within the Shoreline jurisdiction and therefore little to no disturbance to seismically
sensitive areas or steep slopes. No work would be done within the Cedar River and no structures would be placed
within the floodplain that would be expected to increase flood levels. WSDOT, as the lead agency, issued a
Determination of Non-significance (DNS) and Adoption of Existing Environmental Document for the I-405
Corridor Program on March 31, 2008. This decision was made after review of a completed Environmental
Checklist and other information on file (Exhibit 1).
A preliminary estimate of fourteen (14) trees on the river banks would be removed during the bridge widening
work and replaced elsewhere along the Cedar River corridor. WSDOT would obtain a Hydraulic Permit
Application (HPA) from Washington Department of Fish and Wildlife (WDFW). A tree inventory and replacement
plan would be prepared by the design builder and final mitigation would adhere to mitigation ratios for critical
areas disturbed and trees removed. A landscape architect would prepare a roadside restoration plan at the time
of construction permit.
FINDINGS OF FACT:
1. The Planning Division of the City of Renton accepted the above master application for review on November
28, 2017 and determined the application complete on December 8, 2017. The project was placed on hold
on January 18, 2018 and taken off hold on March 6, 2018. The project complies with the 120 -day review
period.
2. The applicant, Washington State Department of Transportation (WSDOT) Northwest Region, is requesting
a Shoreline Substantial Development Permit and Critical Areas Permit to widen Interstate 405 (I-405) from
Tukwila to Renton by adding one new lane in each direction.
3. The Tukwila to Renton Project would extend approximately four miles along I-405 from mile post (MP) 0.0
to SR 169 mile post 4.0 in Renton (Exhibit 2) to accommodate an extra lane in each direction. The project is
located in the lower elevations of Water Resource Inventory Area 8 – Lake Washington Watershed.
4. The I-405 bridge widening and relocation work is part of the larger I-405 Renton to Bellevue Express Toll
Lanes Project. Between SR 167 and SR 169, Stage 3 improvements include combining the two (2) exiting
interior lanes (the existing High Occupancy Vehicle (HOV) lane and adjacent general-purpose lanes) to
create a new dual lane express toll system in both directions. Southbound I-405 would be widened to the
outside including widening the existing southbound I-405 bridge over the Cedar River with a single span
bridge to add one (1) new southbound lane, and the existing northbound outside shoulder would be
converted into a northbound peak-use shoulder lane (Exhibit 3). Structures over I-405 at Cedar Ave S and
Renton Ave S would be replaced to accommodate the widening of the Southbound I-405 roadway.
5. Minor offsite improvements may include pavement markings, drainage improvements, permanent signing,
illumination, intelligent transportation systems and ramp metering, barriers, and tolling gantries.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 3 of 27
6. The nearby zoning, which is not within WSDOT ROW, is zoned Residential-6 (R-6), Residential-8 (R-8),
Residential-10 (R-10), Residential-14 (R-14), Residential Multi-Family (RMF), Commercial Office Residential
(COR), Commercial Arterial (CA), Center Downtown (CD), Medium Industrial (IM) and Resource
Conservation (RC).
7. Project improvements includes roadway and bridge work (Exhibit 4). The site is located within a floodway
and 100-year Special Flood Hazard Area (FEMA Zone AE), Cedar River Regulated Shoreline Reaches (CR-B
and CR-C), high seismic hazard area, moderate landslide hazard area, regulated slopes, and Wellhead
Protection Area Zones 1 and 2. Many of the potential impacts to critical areas would be avoided entirely.
8. Only minor fill and excavation is planned within the shoreline jurisdiction and therefore little to no
disturbance to seismically sensitive areas or steep slopes (Exhibit 11). Trees on the river banks would be
removed during the bridge widening work and replaced at the northern portion of Ron Regis Park within
the Cedar River shoreline buffer (Exhibits 6 and 18).
9. No work is proposed within the Cedar River and no structures would be placed with the floodplain that
would be expected to increase flood levels. The total riparian impacts, on either side of the Cedar River,
would amount to 6,000 square feet.
10. The majority of potential adverse effects associated with the construction and operation of the project
would be avoided or minimized through the use of Best Management Practices (BMPs). WSDOT contractors
would follow procedures outlined in the WSDOT Geotechnical Design Manual (GDM) and Bridge Design
Manual. Unavoidable effects to local soils and geology resulting from project construction would be
mitigated by following standard WSDOT construction practices and the I-405 Programmatic Commitments.
11. The project would reconstruct or replace two (2) local bridges to the Renton Hill Neighborhood (Cedar Ave
S Bridge and Renton Ave S Bridge).
12. Associated noise wall construction, stormwater management facilities to provide water quality treatment,
and detention and upgrade the conveyance system are part of the overall I-405 improvement project.
13. A Summary of Stormwater Management Concepts was submitted with the application (Exhibit 9).
14. A Geology and Soils Report was submitted with the application (Exhibit 10). The Tukwila to Renton Project
lies in a heavily populated area located within the Green-Duwamish River Valley. The majority of the near-
surface soil material in the study area along the I-405 corridor have been modified by the addition of fill
material and is classified as Urban Land or Modified Fill. The fill is underlain by relatively loose, soft soil with
a shallow groundwater table. The local surface geology in the study area also includes wetland deposits,
glacial deposits, and sandstone bedrock.
15. Comments were received from The Muckleshoot Indian Tribe Fisheries Division (“Muckleshoot Indian
Tribe”) from Karen Walter on December 22, 2017 (Exhibit 12); response comments from WSDOT were
forwarded to the Muckleshoot Indian Tribe on March 6, 2018 (Exhibit 13).
16. Comments were received from King County Department of Natural Resources and Parks, Wastewater
Treatment Division (WTD) on December 20, 2017 (Exhibit 14).
17. On March 31, 2008, WSDOT (SEPA lead agency), issued a Determination of Non-significance (DNS) and
Adoption of Existing Environmental Document for the I-405 Corridor Program on March 31, 2008. This
decision was made after review of a completed Environmental Checklist, the Environmental Assessment
(EA) prepared in accordance with the National Environmental Policy Act (NEPA), and other information on
file with the lead agency. This information is available to the public upon request.
18. The proposed replacement of existing utility systems would be considered a replacement and/or
rehabilitation of existing utilities and would be permitted outright in Table 4-3-050C.3 Exemptions – Critical
Areas and Buffers.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 4 of 27
19. Representatives from various city departments have reviewed the application materials to identify and
address issues raised by the proposed development. These comments are contained in the official file, and
the essence of the comments have been incorporated into the appropriate sections of this report and are
attached to this report (Exhibit 19).
20. Comprehensive Plan Compliance: The site is designated Residential Low Density (RLD), Residential Medium
Density (RMD), Residential High Density (RHD), Commercial & Mixed Use (CMU), Employment Area, and
Commercial-Office-Residential (COR). The proposal is compliant with the following Comprehensive Plan
Policies and Goals if all conditions of approval are met:
Compliance Comprehensive Plan Analysis
A. LAND USE ELEMENT:
Under the Growth Management Act (RCW 36.70a) Renton has an obligation to meet the demands of
local and regional growth. Managing growth is not an endeavor that Renton takes on alone. The Puget
Sound Regional Council’s VISION 2040 establishes goals and policies that tie the region together and
support people, prosperity, and the environment. Through the Countywide Planning Policies, King
County jurisdictions further define their roles in accommodating growth using sustainable and
environmentally responsible development practices.
Goal L-U: Preserve, protect, and enhance the quality and functions of the City’s sensitive
areas including: lakes, rivers, major and minor creeks, intermittent stream courses and
their floodplains, wetlands, ground water resources, wildlife habitats, and areas of
seismic and geological hazards.
Policy L-29: Protect the integrity of natural drainage systems and existing land forms,
and maintain wildlife habitat values by preserving and enhancing existing vegetation and
tree canopy coverage to the maximum extent possible and by restoring hydrological
flows and improving the condition of shorelines.
Policy L-34: Ensure buildings, roads, and other features are located on less sensitive
portions of a site when sensitive areas are present.
Policy L-36: Land uses in areas subject to flooding, seismic, geologic, and coal mine
hazards should be designed to prevent property damage and environmental
degradation before, during, and after construction.
Policy L-54: Protect public scenic views and public view corridors, including Renton’s
physical, visual and perceptual linkages to Lake Washington and the Cedar River.
Policy L-55: Preserve natural landforms, vegetation, distinctive stands of trees, natural
slopes, and scenic areas that contribute to the City’s identity, preserve property values,
and visually define the community and neighborhoods.
B. TRANSPORTATION ELEMENT:
Goal T-A: Continue to develop a transportation system that stimulates, supports, and
enhances the safe, efficient and reliable movement of people, vehicles, and goods.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 5 of 27
Goal T-B: Balance transportation needs with other community values and needs by
providing facilities that promote vibrant commerce, clean air and water, and health and
recreation.
Goal T-C: Maintain, preserve, and extend the life and utility of transportation
investments.
Policy T-25: Develop and designate appropriate pedestrian and bicycle commuter routes
along minor arterial and collector arterial corridors.
Policy T-27: Promote non-motorized travel not only as a viable means of transportation
but as an important method for maintaining overall health and fitness.
Policy T-33: Construct improvements and implement actions to facilitate the flow of
HOV’s into, out of, and through Renton.
Policy T-34: Support exclusive freeway/arterial HOV facilities that improve transit travel
times by enabling buses to bypass congestion.
Policy T-49: Encourage development that can be supported by transit and other non-
single occupant vehicle modes.
Policy T-74: Develop and maintain relationships between Renton and other agencies
and local jurisdictions for cooperative planning of common transportation
improvements.
21. Zoning Development Standard Compliance: The nearby zoning, which is not within WSDOT ROW, is zoned
Residential-6 (R-6), Residential-8 (R-8), Residential-10 (R-10), Residential-14 (R-14), Residential Multi-Family
(RMF), Commercial Office Residential (COR), Commercial Arterial (CA), Center Downtown (CD), Medium
Industrial (IM) and Resource Conservation (RC). The proposed project would not be subject to zoning
development standards.
22. The following table contains project elements intended to comply with the Shoreline Master Program (SMP)
bulk and dimensional standards and policies, as outlined in RMC 4-3-090:
SHORELINE MASTER PROGRAM CRITERA:
A. COMPREHENSIVE PLAN COMPLIANCE AND CONSISTENCY, SHORELINE ELEMENT:
Portions of the project are located in the Urban Conservancy Overlay District and the Shoreline High-
Intensity Overlay District. The objective of the Urban Conservancy environment is to protect, conserve,
restore, and manage existing areas with ecological functions of open space, floodplain, and other
sensitive lands where they exist in urban and developed settings, while allowing compatible uses. The
objective of the High Intensity Overlay is to provide opportunities for large-scale office and commercial
employment centers, as well as, multi-family residential use and public services. This district provides
opportunities for water-dependent and water-oriented uses while protecting existing ecological
functions and restoring ecological functions in areas that have been previously degraded. Development
may also provide for public use and/or community use, especially access to and along the water's edge.
The proposal is compliant with the following Shoreline policies:
Policy SH-14. Shoreline use and development should be carried out in a manner that
prevents or mitigates adverse impacts so that the resulting ecological condition does not
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 6 of 27
become worse than the current condition. This means ensuring no net loss of ecological
functions and processes in all development and use. Permitted uses should be designed
and conducted to minimize, in so far as practical, any resultant damage to the ecology
and environment (RCW 90.58.020). Shoreline ecological functions that should be
protected include, but are not limited to, fish and wildlife habitat, food chain support,
and water temperature maintenance. Shoreline processes that shall be protected
include, but are not limited to, water flow; littoral drift; erosion and accretion;
infiltration; ground water recharge and discharge; sediment delivery, transport, and
storage; large woody debris recruitment; organic matter input; nutrient and pathogen
removal; and stream channel formation/maintenance.
Objective SH-E. Existing economic uses and activities on the shorelines should be
recognized and economic uses or activities that are water-oriented should be
encouraged and supported.
Policy SH-18. All economic activities on the shoreline shall provide for no net loss of
ecological functions during construction and operation.
Policy SH-F. Increase public accessibility to shorelines and preserve and improve the
natural amenities.
Policy SH-24. Public access to and along the water's edge should be located, designed,
and maintained in a manner that protects the natural environment and shoreline
ecological functions and is consistent with public safety, as well as, compatible with
water-dependent uses. Preservation or improvement of the natural processes shall be a
basic consideration in the design of shoreline areas to which public access is provided,
including trail systems.
Policy SH-26. Both passive and active public areas should be designed and provided.
Policy SH-30: Development and management of public access should recognize the need
to address adverse impacts to adjacent private shoreline properties and should recognize
and be consistent with legal property rights of the owner. Just compensation shall be
provided to property owners for land acquired for public use. Private access to the
publicly owned shoreline corridor shall be provided to owners of property contiguous to
said corridor in common with the public.
Policy SH-39: Viewpoints, parking, trails, and similar improvements should be considered
for transportation system projects in shoreline areas. Bridge abutments should
incorporate stairs or trails to reach streams where appropriate.
Policy SH-43: Trails should be developed to enhance public enjoyment of and access to
the shoreline:
1) Trails within the shoreline should be developed as an element of non-motorized
circulation, the City’s Parks, Recreation and Natural Areas Plan, Trails and Bicycle Master
Plan, and the Shoreline Public Access program. Trails provide the potential for low impact
public physical and visual access to the shoreline.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 7 of 27
2) Trails should be developed as an element of a system that links together shoreline
public access into an interconnected network including active and passive parks, schools,
public and private open space, native vegetation easements with public access, utility
rights of way, waterways, and other opportunities.
3) Public access to and along the water's edge should be linked with upland community
facilities and the comprehensive trail system that provides non-motorized access
throughout the City.
4) A system of trails on separate rights of way and public streets should be designed and
implemented to provide linkages along shorelines including the Lake Washington Loop,
the Cedar River, the Black River, Springbrook Creek, and the Green River.
Policy SH-44: Road standards should meet roadway function and emergency access
standards and provide for multiple modes, while reducing impervious surfaces, where
feasible, and managing surface water runoff to achieve appropriate water quality.
Objective SH-J. Provide for the timely restoration enhancement of shorelines with
impaired ecological functions. Such restoration should occur through a combination of
public and private programs and actions. This Master Program includes a restoration
element that identifies restoration opportunities and facilitates appropriate publicly and
privately initiated restoration projects. The goal of this effort is to improve shoreline
ecological functions.
B. GENERAL DEVELOPMENT STANDARDS:
The subject site is classified as Shoreline High Intensity and Urban Conservancy on the City of Renton
Shoreline Overlay Map. The following development standards are applicable to the proposal:
1. Environmental Effects:
a. No Net Loss of Ecological Functions:
Shoreline use and development shall be carried out in a manner that prevents or
mitigates adverse impacts to ensure no net loss of ecological functions and processes in
all development and use. Permitted uses are designed and conducted to minimize, in so
far as practical, any resultant damage to the ecology and environment of the shoreline
area and any interference with the public's use of the water (RCW 90.58.020). Shoreline
ecological functions that shall be protected include, but are not limited to, fish and
wildlife habitat, food chain support, and water temperature maintenance. Shoreline
processes that shall be protected include, but are not limited to, water flow; erosion and
accretion; infiltration; groundwater recharge and discharge; sediment delivery,
transport, and storage; large woody debris recruitment; organic matter input; nutrient
and pathogen removal; and stream channel formation/maintenance.
Staff Comment: The applicant is proposing only minor amounts of fill (approximately 100
cubic yards) and excavation within the shoreline jurisdiction (Exhibits 5 and 7). No work
would be done within the Cedar River and no structures would be placed within the
floodplain that would be expected to increase flood levels. The proposed plan does not
require added fill materials within the Cedar River floodplain. The closest bridge pier
would be approximately 30 feet landward of the ordinary high-water mark (OHWM) on
the left (south) bank and 80 feet on the right (north) bank. The exiting 82,500 square foot
existing I-405 Bridge over the Cedar River would be increased by 9,500 square feet.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 8 of 27
Vegetation under the bridge over the Cedar River is limited to shrubs, blackberry and a
few trees. River banks downstream and on the south side of the upstream channel
support mixed vegetation consisting of Douglas fir, big-leaf maple, red alder, black
cottonwood, and blackberry. There is approximately 2,000 square feet of vegetation
within the project impact area. A preliminary estimate of fourteen (14) trees would need
to be removed during the bridge replacement work, including one (1) tree with a diameter
greater than 30 inches (30”). The species impacted include big leaf maple and black
cottonwood.
According to the applicant, this reach of the lower Cedar River is highly disturbed. The
river is completely constrained between levees and revetments and it was regularly
dredged to prevent flooding from 1912 until the mid-1979s. Portions of this reach were
again dredged in 1999. The applicant maintains that this reach of the Cedar River is
essentially one long riffle with little habitat complexity. Urban and residential uses along
this reach contribute to local water quality problems, eliminate natural floodplain
connections, prevent the establishment of a riparian buffer, and eliminate the
opportunity for large wood material (LWM) accumulations in the channel.
Despite its limitations, this reach of river serves as a migration route for many salmonid
fishes and is used for extensive spawning and limited rearing by sockeye (Oncorhynchus
nerka), Puget Sound (PS) Chinook (O. tshawytscha), and coho (O. kisutch) salmon; PS
steelhead (O. mykiss) and cutthroat trout (O. clarki); as well as longfin smelt (Spirinchus
thaleichthys) (WSDOT Biological Assessment, Kerwin and Nelson 2000).
Within the project vicinity, the Cedar River watershed has been substantially altered to
accommodate residential, commercial, and industrial land uses. Alterations include bank
hardening with riprap and concrete, channelization, removal of riparian vegetation, and
alteration of instream habitat. Channelization has isolated much of the river from its
historic floodplain.
Significant changes have also occurred in the riparian composition of the watershed.
Mature forests of native vegetation have been replaced by a mix of immature native
vegetation and non-native invasive and ornamental plant species. Vegetation in the
vicinity of the lower Cedar River consists of Japanese knotweed (Fallopia japonica),
Himalayan blackberry (Rubus armeniacus), wild clematis (Clematis vitalba), black
cottonwood (Populus trichocarpa), bigleaf maple (Acer macrophyllum), and other
deciduous trees and shrubs.
According to the applicant, shoreline and critical area impacts were avoided and
minimized by the project to the greatest extent feasible; however, the Design Builder may
identify further minimization measures through final design and construction of the
project. The preliminary design utilizes several avoidance and minimization opportunities
including selective widening, widening to the median, and use of over steepened slopes
and retaining walls.
The applicant contends that the proposed Cedar River stream buffer enhancements and
mitigation plantings at Ron Regis Park would increase the structural complexity of the
vegetation canopy and provide cover and forage material for wildlife (Exhibit 17). Over
time, these enhancements are expected to improve shoreline ecological functions by
reducing permanent erosion and accretion; increasing infiltration, large woody material
recruitment, and organic matter input; enhancing nutrient and pathogen removal; and
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 9 of 27
supporting stream channel formation/maintenance, fish and wildlife habitat, and food
chain complexity consistent with the City of Renton’s Shoreline Master Program.
b. Burden on Applicant:
Applicants for permits have the burden of proving that the proposed development is
consistent with the criteria set forth in the Shoreline Master Program and the Shoreline
Management Act, including demonstrating all reasonable efforts have been taken to
provide sufficient mitigation such that the activity does not result in net loss of ecological
functions.
2. Use Compatibility and Aesthetic Effects:
Shoreline use and development activities shall be designed and operated to allow the public’s visual
access to the water and shoreline and maintain shoreline scenic and aesthetic qualities that are derived
from natural features, such as shoreforms and vegetative cover.
a. View Obstruction and Visual Quality:
N/A
View Corridors Required: Where commercial, industrial, multiple use, multi-family
and/or multi-lot developments are proposed, primary structures shall provide for view
corridors between buildings where views of the shoreline are available from public right-
of-way or trails.
N/A
Maximum Building Height: Buildings shall be limited to a height of no more than 35 feet
above average finished grade level except at specific locations.
Staff Comment: The Project does not include construction of buildings.
Minimum Setbacks for Commercial Development Adjacent to Residential or Park Uses:
All new or expanded commercial development adjacent to residential use and public
parks shall provide fifteen feet (15') setbacks from adjacent properties to attenuate
proximity impacts such as noise, light and glare, and may address scale and aesthetic
impacts. Fencing or landscape areas may be required to provide a visual screen.
Staff Comment: The bridge replacement and road widening activities would be located
more than 15 feet from the residential use and would continue to allow for public
shoreline access and recreational opportunities at Cedar River Trail.
Compliant if
condition of
approval is
met
Lighting Requirements: Display and other exterior lighting shall be designed and
operated so as to prevent glare, to avoid illuminating nearby properties used for
noncommercial purposes, and to prevent hazards for public traffic. Methods of
controlling spillover light include, but are not limited to, limits on the height of light
structure, limits on light levels of fixtures, light shields, and screening.
Staff Comment: Street lighting located outside of WSDOT limited access right-of-way
(ROW) would be subject to City of Renton illumination requirements. The lighting affixed
to the underside of the existing bridge is required to illuminate the pedestrian bridge and
walking paths on both sides of the Cedar River. According to the applicant, the widened
bridge would not require any additional luminaires and would increase the shielding
effect from the existing illumination system.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 10 of 27
The lights nearest the river channel were originally fitted with sleeve-like attachments to
direct lighting to the walking paths and minimize ambient lighting of the channel. The
City is not sure if all of the sleeve-like attachments are all still in place. These attachments
are showing signs of failure following their installation. In order to ensure pedestrian
safety and reduce nighttime lighting within the Cedar River channel, staff recommends,
as a condition of approval, that the applicant replace the existing non-factory lights with
a lighting product that reduces fish predation and provides for pedestrian safety. A
lighting plan shall be submitted with the construction permit application to be reviewed
and approved by the Current Planning Project Manager prior to construction permit
approval.
Reflected Lights to Be Limited: Building surfaces on or adjacent to the water shall employ
materials that limit reflected light.
Staff Comment: The road improvements would be constructed with materials that limit
reflected light, such as asphalt, concrete and vegetation. There new bridge over Cedar
River would not include any light penetrating materials in the design.
N/A
Integration and Screening of Mechanical Equipment: Building mechanical equipment
shall be incorporated into building architectural features, such as pitched roofs, to the
maximum extent feasible. Where mechanical equipment cannot be incorporated into
architectural features, a visual screen shall be provided consistent with building exterior
materials that obstructs views of such equipment.
Visual Prominence of Freestanding Structures to Be Minimized: Facilities not
incorporated into buildings including fences, piers, poles, wires, lights, and other
freestanding structures shall be designed to minimize visual prominence.
Staff Comment: Project improvements have been designed to minimize visual prominence
along the shoreline while enhancing safety for the public. The project includes expanding
the southbound I-405 Cedar River Bridge over Cedar River and reconstructing or replacing
the fly-over bridges to the Renton Hill Neighborhood. There would be no in-water
structures constructed as part of the I-405 Tukwila to Renton Improvement Project, Stage
3.
Maximum Stair and Walkway Width: Stairs and walkways located within shoreline
vegetated buffers shall not exceed four feet (4') in width; provided, that where ADA
requirements apply, such facilities may be increased to six feet (6') in width. Stairways
shall conform to the existing topography to the extent feasible.
Staff Comment: The applicant is not proposing stairs or walkways within shoreline
vegetated buffer areas.
b. Community Disturbances:
Noise, odors, night lighting, water and land traffic, and other structures and activities
shall be considered in the design plans and their impacts avoided or mitigated.
Staff Comment: Noise and vibration impacts would primarily result from demolition and
construction work. Equipment used onsite may include, but is not limited to, back hoes,
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 11 of 27
excavators, loaders, graders, rollers, dump trucks, concrete trucks, vactors, mobile and
stationary cranes, drilling machines, pile drivers, and hand tools.
Construction is anticipated to start in 2019 and the Project is expected open to traffic in
2024. Construction hours would conform to the City of Renton’s noise daytime ordinance
requirements to the extent possible. For nighttime work, WSDOT would obtain a noise
variance at a future date.
Existing traffic capacity would be maintained during construction activities to the extent
possible. To the extent feasible, lane or roadway closures would be minimized and
scheduled to occur when there is the least effect on traffic within the project corridor,
such as overnight and weekend time periods.
WSDOT would coordinate with the local agencies and other projects to prepare a Traffic
Management Plan prior to making any changes to the traffic flow or lane closures. Local
agencies, the public, school districts, emergency service providers, and transit agencies
would be informed of the changes in advance through the media, the website, and an
email listserv. Pedestrian and bicycle circulation would also be maintained as much as
possible throughout construction.
3. Public Access:
Physical or visual access to shorelines shall be incorporated in all new development when the
development would either generate a demand for one or more forms of such access, would impair
existing legal access opportunities or rights, or is required to meet the specific policies and regulations
of the Shoreline Master Program.
a. Design Criteria for Public Access Sites:
Walkways or Trails Required in Vegetated Open Space: Public access on sites where
vegetated open space is provided along the shoreline shall consist of a public pedestrian
walkway parallel to the Ordinary High Water Mark (OHWM) of the property. The
walkway shall be buffered from sensitive ecological features, may be set back from the
water’s edge, and may provide limited and controlled access to sensitive features and
the water’s edge where appropriate. Fencing may be provided to control damage to
plants and other sensitive ecological features and where appropriate. Trails shall be
constructed of permeable materials and limited to four feet (4') to six feet (6') in width
to reduce impacts to ecologically sensitive resources.
Staff Comment: The existing Cedar River Trail is located within the project site. Only minor
realignment of the paved trail is proposed to accommodate the new bridge pier located
in the Cedar River shoreline. The realignment would be located outside of the OHWM,
immediately adjacent to the existing trail (Exhibit 18).
b. Public Access Development Standards:
Planned Trails to Be Provided: Where public trails are indicated on the City’s
transportation, park, or other plans, construction of trails shall be provided within
shoreline and non-shoreline areas of a site.
Staff Comment: The Project proposes to realign a small portion of Cedar River Trail,
designated a regional trail by King County, under I-405 Cedar River Bridge. The Cedar
River Trail is the longest non-motorized facility in the City, and because of its central
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 12 of 27
location within the City, can therefore be seen as the spine of the City’s trails and bicycle
network.
c. Public Access Requirements by Reach:
May Creek Reach (CR-B): Public access should generally be provided within the
corridor of public lands adjacent to the river; however, adjacent private parcels not
separated by public streets should provide active open space and other facilities to
provide gathering places to enjoy the shoreline environment, together with water-
oriented uses. Revisions to the existing trail to relocate further from the water’s edge
to allow revegetation should be considered in the future as part of public park and
river maintenance plans.
May Creek Reach (CR-C): Public/community access along the waterfront should be
provided as private lands on the north side of the river redevelop, considered along
with the goal of restoration of ecological functions. Public or community access shall be
provided when residential development occurs consistent with standards of the
Shoreline Master Program.
4. Building and Development Location – Shoreline Orientation:
Shoreline developments shall locate the water-dependent, water-related, and water-enjoyment
portions of their developments along the shoreline. Development and use shall be designed in a manner
that directs land alteration to the least sensitive portions of the site to maximize vegetation
conservation; minimize impervious surfaces and runoff; protect riparian, nearshore and wetland
habitats; protect wildlife and habitats; protect archaeological, historic and cultural resources; and
preserve aesthetic values.
a. Design and Performance Standards:
Location of Development: Development and use shall be designed in a manner that
directs land alteration to the least sensitive portions of the site.
Staff Comment: WSDOT’s design directs land alteration to the least sensitive portion of
the site.
Location for Accessory Development: Accessory development or use that does not
require a shoreline location shall be located outside of shoreline jurisdiction unless such
development is required to serve approved water-oriented uses and/or developments
or unless otherwise allowed in a High Intensity designation. When sited within shoreline
jurisdiction, uses and/or developments such as parking, service buildings or areas, access
roads, utilities, signs and storage of materials shall be located inland away from the
land/water interface and landward of water-oriented developments and/or other
approved uses unless a location closer to the water is reasonably necessary.
Navigation and Recreation to Be Preserved: Shoreline uses shall not deprive other uses
of reasonable access to navigable waters. Existing water-related recreation shall be
preserved.
Staff Comment: The project would not deprive other uses of reasonable access to
navigable waters and existing water-related recreation would be preserved.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 13 of 27
5. Archaeological, Historical, and Cultural Resources:
Compliant if
conditions
of approval
are met
Detailed Cultural Assessments May Be Required: The City will work with tribal, State,
Federal, and other local governments as appropriate to identify significant local
historical, cultural, and archaeological sites in observance of applicable State and Federal
laws protecting such information from general public disclosure. Detailed cultural
assessments may be required in areas with undocumented resources based on the
probability of the presence of cultural resources.
Staff Comment: The project proposal and notice of application were provided to
reviewing agencies including, but not limited to, the State Department of Archaeology &
Historic Preservation (DAHP), the Muckleshoot Indian Tribe, and King County Wastewater
Treatment Division (WTD). Comments were received from the Muckleshoot Indian Tribe
and WTD. No other agency comments were received as part of the notice of application.
If archaeological deposits of unevaluated significance are encountered during
construction activities, ground disturbance should be halted and activities directed away
from the area. In order to protect archaeological resources, staff recommends, as a
condition of approval, that if any Native American grave(s) or archaeological/cultural
resources (Indian artifacts) are found, all construction activity shall stop and the
owner/developer shall immediately notify the City of Renton planning department,
concerned Tribes’ cultural committees, and the Washington State Department of
Archeological and Historic Preservation.
Coordination Encouraged: Owners of property containing identified or probable
historical, cultural, or archaeological sites are encouraged to coordinate well in advance
of application for development to assure that appropriate agencies such as the
Washington State Department of Archaeology and Historic Preservation, affected tribes,
and historic preservation groups have ample time to assess the site and identify the
potential for cultural resources.
Staff Comment: See comment above.
Detailed Cultural Assessments Required: Upon receipt of application for a development
in an area of known or probable cultural resources, the City shall require a site
assessment by a qualified professional archaeologist or historic preservation professional
and ensure review by qualified parties including the Washington State Department of
Archaeology and Historic Preservation, affected tribes, and historic preservation groups.
Staff Comment: See comment above.
Work to Stop Upon Discovery: If historical, cultural, or archaeological sites or artifacts
are discovered in the process of development, work on that portion of the site shall be
stopped immediately, the site secured, and the find reported as soon as possible to the
Administrator of the Department of Community and Economic Development or
designee. Upon notification of such find, the property owner shall notify the Washington
State Department of Archaeology and Historic Preservation and affected tribes. The
Administrator of the Department of Community and Economic Development or designee
shall provide for a site investigation by a qualified professional and may provide for
avoidance, or conservation of the resources, in coordination with appropriate agencies.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 14 of 27
Staff Comment: See comment above.
Access for Educational Purposes Encouraged: Land owners are encouraged to provide
access to qualified professionals and the general public if appropriate for the purpose of
public education related to a cultural resource identified on a property.
Staff Comment: See comment above.
6. Standards for Density, Setbacks, and Height – Activities Exempt from Buffers and Setbacks:
The following development activities are not subject to buffers and setbacks; provided, that they are
constructed and maintained in a manner that minimizes adverse impacts on shoreline ecological
functions; and provided further, that they comply with all the applicable regulations in RMC Title IV.
N/A
Water-Dependent Development: Those portions of approved water-dependent
development that require a location waterward of the OHWM of streams, rivers, lakes,
ponds, marine shorelines, associated wetlands, and/or within their associated buffers.
Compliant if
conditions
of approval
are met
Vegetation Conservation Buffer: Water bodies defined as shorelines shall have a
minimum one hundred-foot (100') vegetation management buffer measured from the
OHWM of the regulated shoreline of the State. Areas approved for water-dependent use
or public access may be excluded from vegetated buffer if the approval is granted
through review of a Substantial Development Permit; provided, that the area excluded
is the minimum needed to provide for the water-dependent use or public access.
Staff Comment: Access to May Creek Bridge would be approximately 30 feet landward of
the OHWM. WSDOT is proposing to realign Cedar River Trail as a result of the new pier
required for the I-405 Cedar River Bridge widening to accommodate additional traffic
lanes. Disturbed areas would be restored onsite as much as feasible; however, up to 6,000
square feet of total riparian impacts would be mitigated for offsite at Ron Regis Park in
Renton as potential Cedar River buffer enhancements. The location is close to a cut bank
of the Cedar River where long-term recruitment is highly likely and is adjacent to a
riparian mitigation site being restored by Forterra, a land conservation organization.
Currently European blackberry and mature cottonwood trees are among the dominant
species. Based on the surrounding vegetation, the site would likely support western red
cedar, hemlock, fir Oregon ash, big-leaf maple and an understory of salmonberry,
snowberry, red-osier dogwood and pacific nine bark. Clearing the invasive blackberry and
planting indigenous trees and shrubs would provide both trees for recruitment, and
riparian shade as well as deterring the re-establishment of non-native vegetation.
WSDOT has indicated that the monitoring period for the replanting work would be for
five years. As a condition of approval, staff is recommending that applicant complete an
inter-local agreement (ILA) between the WSDOT and the City of Renton for the tree
planting mitigation work at Ron Regis Park. In addition, the applicant shall submit a
detailed landscape plan with maintenance and temporary irrigation for review and
approval by the Current Planning Project Manager prior to construction permit approval.
N/A
Aquatic Building Height – Maximum:
In water – 35 ft.
Additional height may be allowed if essential to the function of a water-dependent use.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 15 of 27
N/A
High Intensity Building Height – Maximum:
In water – 35 ft.
Within 100 feet of OHWM – 35 ft.
More than 100 feet from the OHWM – 35 ft.
Additional height may be allowed if essential to the function of a water-dependent use.
Height up to that established in chapter 4-2 RMC, Zoning Districts – Uses and Standards,
may be allowed for non-water-dependent uses in the following reaches: Lake
Washington Reaches C, H, I, and J; Cedar River Reaches A, B, and C; Black River Reach A;
May Creek Reach B; and Springbrook Creek Reaches B, C, and D:
For buildings landward of one hundred feet (100') from OHWM, the maximum building
height shall be defined by a maximum allowable building height envelope that shall:
i. Begin along a line laying parallel to and one hundred feet (100') from OHWM at a height
of either thirty-five feet (35') or one half (1/2) the maximum height allowed in the
underlying zone, whichever is greater; and
ii. Have an upward, landward transition at a slope of one vertical to one horizontal from
the beginning height either (a) until the line at which the maximum height allowed in the
underlying zoning in chapter 4-2 RMC is reached (from which line the height envelope
shall extend landward at the maximum height allowed in the underlying zoning), or (b)
to the end of shoreline jurisdiction, whichever comes first.
N/A Impervious area within the Buffer/Setback: 5%
Impervious area within 100 feet of the OHWM: 75%
Staff Comment: See comments above under “Vegetation Conservation Buffer” in Section
B.6.
7. Use Regulations:
a. Public Hiking and Bicycle Trails, Over Land:
A public trail is permitted outright, provided that the use does not degrade the ecological
functions or natural character of the shoreline area.
Staff Comment: The proposed improvements to I-405 were designed to retain public trail
access and recreational opportunities. The realignment of Cedar River Trail would not
degrade the ecological functions or natural character of the shoreline area.
8. Recreation:
a. Recreation activities are allowed when:
i. There is no net loss of ecological functions, including on- and offsite mitigation.
ii. Water-related and water-enjoyment uses do not displace water-dependent uses and
are consistent with existing water-related and water-enjoyment uses.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 16 of 27
iii. The level of human activity involved in passive or active recreation shall be
appropriate to the ecological features and shoreline environment.
iv. State-owned shorelines shall be recognized as particularly adapted to providing
wilderness beaches, ecological study areas, and other recreational uses for the public in
accordance with RCW 90.58.100(4).
Staff Comment: See comments above under “No Net Loss of Ecological Functions,”
Section B.1.a.
b. Location Relative to the Shoreline: Activities provided by recreational facilities must bear
a substantial relationship to the shoreline, or provide physical or visual access to the
shoreline.
ii. Water-related recreation such as picnicking, hiking, and walking should be located near
the shoreline.
Staff Comment: The existing Cedar River Trail is located parallel to the shoreline.
c. Public Recreation: Public recreation uses shall be permitted within the shoreline only
when the following criteria are considered:
i. The natural character of the shoreline is preserved and the resources and ecology of
the shoreline are protected.
ii. Accessibility to the water’s edge is provided consistent with public safety needs and in
consideration of natural features.
iii. Recreational development shall be of such variety as to satisfy the diversity of
demands of the local community.
iv. Water-related and water-enjoyment uses do not displace water-dependent uses and
uses are consistent with existing water-related and water-enjoyment uses.
v. Recreational development is located and designed to minimize detrimental impact on
the adjoining property.
vi. The development provides parking and other necessary facilities to handle the
designed public use.
vii. Effects on private property are consistent with all relevant constitutional and other
legal limitations on regulation or acquisition of private property.
viii. Public parks and other public lands shall be managed in a manner that provides a
balance between providing opportunities for recreation and restoration and
enhancement of the shoreline. Major park development shall be approved only after a
master planning process that provides for a balance of these elements.
Staff Comment: See comments under “Recreation activities are allowed when,” Section
B.8.a.
9. Transportation:
a. Roads:
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 17 of 27
i. New public or private roads and driveways shall be located inland from the land/water
interface, preferably out of the shoreline, unless:
(a) Perpendicular water crossings are required for access to authorized uses consistent
with the Shoreline Master Program; or
(b) Facilities are primarily oriented to pedestrian and nonmotorized use and provide an
opportunity for a substantial number of people to enjoy shoreline areas, and are
consistent with policies and regulations for ecological protection.
ii. Road locations shall be planned to fit the topography, where possible, in order that
minimum alteration of existing natural conditions will be necessary.
iii. RCW 36.87.130 prohibits vacation of any right-of-way that abuts freshwater except
for port, recreational, educational or industrial purposes. Therefore, development,
abandonment, or alteration of undeveloped road ends within Shoreline Master Program
jurisdiction is prohibited unless an alternate use is approved in accordance with the
Shoreline Master Program.
Staff Comment: According to WSDOT, Interstate 405 is one of the state’s most congested
corridors. The I-405 Widening and Express Toll Lanes project would add new capacity to
create a two-lane express toll lane system between SR 167 and Bellevue. In general, the
project would add one new land in each direction. This project is designed to improve
speeds and trip reliability for all travelers.
The proposed work area is part of a complex of multiple transportation crossings that
include the Houser Way bridge and a BNSF bridge to the west of the I-405 north and
southbound lanes. Land use and ownership adjacent to the I-405 corridor includes Renton
Old City Hall on the south bank and Liberty Park and Cedar River Park on the north bank.
The alignment also crosses or runs adjacent to several drainages, most notably the Cedar
River, May Creek, and Coal Creek. I-405 crosses the Cedar River, an anadromous fish-
bearing stream, approximately 1.62 miles upstream of its outlet into Lake Washington.
The improvements maintain perpendicular water crossings and access to shoreline areas.
WSDOT would meet American Association of State Highway and Transportation Officials
(AASHTO) design standards.
b. Trails:
i. Trails that provide public access on or near the water shall be located, designed, and
maintained in a manner that protects the existing environment and shoreline ecological
functions. Preservation or improvement of the natural amenities shall be a basic
consideration in the design of shoreline trails.
ii. The location and design of trails shall create the minimum impact on adjacent property
owners including privacy and noise.
iii. Over-water structures may be provided for trails in cases where:
(a) Key trail links for local or regional trails must cross streams, wetlands, or other
water bodies.
(b) For interpretive facilities.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 18 of 27
(c) To protect sensitive riparian and wetland areas from the adverse impacts of at
grade trails, including soil compaction, erosion potential and impedance of surface
and groundwater movement.
iv. Trail width and surface materials shall be appropriate for the context with narrow soft
surface trails in areas of high ecological sensitivity where the physical impacts of the trail
and the number of users should be minimized with wider hard-surfaced trails with higher
use located in less ecologically sensitive areas.
Staff Comment: Realignment of the Cedar River Trail would be designed to protect the
existing environment and shoreline ecological functions and minimize the impact on
adjacent properties. WSDOT is proposing to realign the City’s Cedar River Trail under the
I-405 Cedar River Bridge as a result of the bridge widening into the existing trail’s path.
28. The following table contains project elements intended to comply with the Critical Areas Regulations and
policies, as outlined in RMC 4-3-050:
CRITICAL AREA REGULATIONS CRITERA:
A. COMPREHENSIVE PLAN COMPLIANCE AND CONSISTENCY, CRITICAL AREA ELEMENT:
Critical areas are defined as wetlands, aquifer recharge areas, fish and wildlife habitat, frequently
flooded, and geologically hazardous areas regulated by the City of Renton’s Critical Areas Ordinance.
Sustainability recognizes that natural systems are essential to providing both economic needs and
quality of life and that actions of today have an impact on the environment which impacts the future.
The quality of Renton’s land, air, and water affect the health and resiliency of everyone in the
community.
The proposal is compliant with the following goals:
Goal L-P: Minimize adverse impacts to natural systems, and address impacts of past
practice where feasible, through leadership, policy, regulation, and regional
coordination.
Goal L-U: Preserve, protect, and enhance the quality and functions of the City’s sensitive
areas including: lakes, rivers, major and minor creeks, intermittent stream courses and
their floodplains, wetlands, ground water resources, wildlife habitats, and areas of
seismic and geological hazards.
Goal L-V: Protect the natural functions of 100 year floodplains and floodways to prevent
threats to life, property, and public safety associated with flooding hazards.
B. ALTERATIONS TO CRITICAL AREAS:
The subject site is classified as a Critical Area on the City of Renton (COR) Map. Stream relocation may
be allowed when analyzed in an accepted stream or lake assessment. The following criteria and
conditions to the proposal must be met:
1. Onsite Mitigation:
Onsite mitigation is required unless a finding is made that onsite mitigation is not
feasible or desirable.
Staff Comment: I-405 road widening work would result in impacts to Cedar River, 0.089-
acres of permanent stream buffer impacts and 0.035-acres of temporary stream buffer
impacts. Temporary impacts would be restored in-place and permanent impacts would
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 19 of 27
be mitigated for via coordination between WSDOT and the City of Renton. Ron Regis
Park, near the Cedar River, has been selected as the receiving site for unavoidable
riparian impacts.
This project is proposing to utilize the “Design-Build” method of delivery, meaning that
all of the impacts and corresponding mitigation discussed in the reports are based on
low-level conceptual project design, which would be refined and finalized by a Design-
Build contractor prior to construction.
See also comments under “No Net Loss of Ecological Functions,” Section B.1.a.
2. Offsite Mitigation:
Offsite mitigation may be allowed when located within the same drainage sub-basin as
the subject site and if it achieves equal or improved ecological functions over mitigation
on the subject site.
Staff Comment: To fully compensate for unavoidable permanent impacts to Cedar River,
WSDOT proposes to plant offsite at Ron Regis Park in Renton as Cedar River buffer
enhancements. See also comments under “Vegetation Conservation Buffer,” under FOF
22, Section B.6 above.
3. Mitigation Type:
In all cases, mitigation shall provide for equivalent or greater biological functions. Additionally, there
shall be no net loss of riparian area or shoreline ecological function resulting from any activity or land
use occurring within the regulated buffer area. Types of mitigation include: daylighting, removal of
impervious surfaces and in-stream mitigation.
Daylighting (returning to open channel) of streams or removal of manmade salmonid
migration barriers.
Staff Comment: Cedar River flows under a bridge at I-405 just south of Maple Valley
Highway (SR 169). The bridge is being widened as part of the project and one
additional bridge pier and footing would be added. The proposed plan does not require
added fill materials within the Cedar River floodplain and disturbed areas are to be
restored to the existing grade. According to the applicant, there may be minor
amounts of fill (approximately 100 cubic yards) in some locations associated with final
grading. All fill material shall be obtained from approved fill sources. The applicant
would be required to provide a fill source statement to the City to ensure clean fill used
with the construction permit application.
See also comments under “No Net Loss of Ecological Functions,” Section B.1.a.
4. Development Standards:
No proposal shall result in a loss of critical area functions or values. If the application of these provisions
would deny all reasonable use of the property, the applicant may apply for a variance as identified in
RMC 4-9-250.
Setbacks and buffers from critical area buffers:
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 20 of 27
Type F streams require a 115-foot critical area buffer width, Type Np require a 75 foot
buffer, and Type Ns require a 50 foot buffer. In additional a 15-foot structure setback is
required beyond the buffer. Landscaping is allowed in the building setback area.
Critical Area Buffers and Structure Setbacks form Buffers (Table 4-3-050G.2):
Critical Area
Category or Type
Critical Area Buffer Width Structure Setback
beyond Buffer
Wetlands6
Low Impact Land Uses:7
High
Habitat
Function
(8-9
points)
Moderate
Habitat
Function
(5-7
points)
Low
Habitat
Function
(3-4
points)
All Other
Scores
15 ft.
Category I
– Bogs &
Natural
Heritage
Wetlands
175 ft.
Category I
– All
Others
175 ft. 125 ft. 75 ft. 75 ft.
Category
II 150 ft. 100 ft. 75 ft. n/a
Category
III 100 ft. 75 ft. 50 ft. n/a
Category
IV 40 ft. n/a
All Other Land Uses:
High
Habitat
Function
(8-9
points)
Moderate
Habitat
Function
(5-7
points)
Low
Habitat
Function
(3-4
points)
All Other
Scores
15 ft.
Category I
– Bogs &
Natural
Heritage
Wetlands
200 ft.
Category I
– All
Others
200 ft. 150 ft. 115 ft. 115 ft.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 21 of 27
Category
II 175 ft. 150 ft. 100 ft. n/a
Category
III 125 ft. 100 ft. 75 ft. n/a
Category
IV 50 ft. n/a
Footnotes:
6. Areas that are functionally and effectively disconnected from the wetland by a
permanent road or other substantially developed surface of sufficient width and with
use characteristics such that buffer functions are not provided shall not be counted
toward the minimum buffer unless these areas can be feasibly removed, relocated or
restored to provide buffer functions.
7. Low intensity land uses include but are not limited to the following: unpaved trails,
low intensity open space (hiking, bird-watching, preservation of natural resources, etc.)
and utility corridor without a maintenance road and little or no vegetation management.
Staff Comment: The Critical Areas Regulations, Table 4-3-050G.2 establishes
development standards for critical areas based on category or type. Completion of the I-
405 corridor work would require construction of embankments, ramps, overpasses, noise
walls, drainage systems, stormwater detention and treatment facilities, sanitary sewer
mains and a fish passable stream crossing. Drainage plans and a drainage report
complying with the adopted 2017 Renton Surface Water Design Manual would be
required. Furthermore, pursuant to RMC 4-3-050C.3 “Exemptions – Critical Areas and
Buffers,” indicate exempt activities within critical areas and associated buffers, such as
roads and utilities where critical area and required buffer impacts are minimized and
disturbed areas are restored.
The Project, as proposed, is expected to result in temporary and permanent impacts to
riparian buffers. There are no significant adverse impacts associated with the project.
WSDOT, as lead agency, adopted a Determination of Nonsignificant Impact on March
31, 2008 (Exhibit 1). The environmental impacts to shoreline buffers were avoided and
minimized to the greatest extent feasible and/or mitigation measure have been
recommended.
Flood Hazard Areas: Flood hazard areas are defined as the land in the floodplain subject
to one percent (1%) or greater chance of flooding in any given year. Encroachments,
including fill, new construction, substantial improvements, and other development are
prohibited unless certification by a registered professional engineer demonstrates
through hydrologic and hydraulic analyses performed in accordance with standard
engineering practice that:
(a) Encroachments shall not result in any increase in flood levels during the occurrence
of the base flood discharge; and
(b) There are no adverse impacts to the subject property or abutting or adjacent
properties; and
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 22 of 27
(c) There are no higher flood elevations upstream; and
(d) The impact due to floodway encroachment shall be analyzed using future land use
condition flows.
Staff Comment: Within the floodway, encroachments including fill, new construction,
substantial improvements, and other development are prohibited unless certification by
a registered professional engineer demonstrates through hydrologic and hydraulic
analyses, performed in accordance with standard engineering practice, that
encroachments shall not result in any increase in flood levels during the occurrence of
the base flood discharge, that there are no adverse impacts to the subject property or
abutting or adjacent properties, that there are no higher flood elevations upstream, and
that the impact due to floodway encroachment shall be analyzed using future land use
condition flows. Future flow conditions should be considered for proposed bridge
proposals crossing floodways.
The City of Renton’s Municipal Code (RMC) 4-3-050 Critical Areas Regulations, backed by
Executive Order 11988 Floodplain Management, require zero-rise in floodplain
elevations due to construction projects.
The project is being developed at a conceptual level in advance of final design and
construction through design-build contracting. WSDOT has been developing conceptual
designs in coordination with the City of Renton’s stormwater utility staff, with the intent
to establish and verify performance criteria that would be met by the final design.
WSDOT would need to provide a zero-rise hydraulic analysis of the existing and proposed
site conditions within the floodplain of the Cedar River per section 4.4.2 of the 2017 City
of Renton Surface Water Design Manual.
The current flood insurance rate map for the Green River is dated May 16, 1995. The
Federal Emergency Management Agency (FEMA) has converted all flood insurance rate
maps into digital flood insurance rate maps. FEMA published a preliminary Digital Flood
Insurance Rate Maps (DFIRM) in September 2017. The proposed floodplain maps reflect
changes to the current effective Federal Emergency Management Agency DFIRM. Within
Renton, the floodplain map changes are in the Cedar River valley. WSDOT based the
existing site conditions on the 2017 Preliminary FEMA DFIRM Floodplain/Floodway data.
The FEMA Floodplain Map in effect at the time of final design by the Design Builder shall
be used. The anticipated effective date of King County Communities’ FEMA Flood
Insurance Rate Map is Summer 2019. If the final grading plan, filling, or any other activity
reduces the effective storage volume of the floodplain, compensatory storage shall be
created per section 4-3-050 of the Renton Municipal Code (RMC). The project shall not
result in any change to the floodplain or floodway.
Impervious area impacts:
Staff Comment: Between SR 167 and SR 169, Stage 3 improvements include combining
the two existing interior lanes (the existing HOV and adjacent general-purpose lanes) to
create a new dual lane express toll system in both directions. Southbound I-405 would
be widened to the outside including widening the southbound I-405 bridge over the
Cedar River to add one new southbound lane, and the existing northbound outside
shoulder would be converted into a northbound peak-use shoulder lane. Structures over
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 23 of 27
I-405 at Cedar Ave S and Renton Ave S would be rebuilt to accommodate the widened
southbound I-405 roadway.
The work at the Cedar River Bridge is Stage 3 of I-405 Tukwila to Renton Improvement
Project and is currently funded for construction during the same timeframe as the I-405
Renton to Bellevue Project, Stage 1. The Stage 3 stormwater concepts have changes from
those that were developed to support the 2008 I-405, Tukwila to Renton Improvement
Project (I-5 to SR 169 Phase 2) Environmental Assessment. The smaller scope of Stage 3
does not support the advancing the larger concepts associated with full build-out. Within
the Cedar River Threshold Discharge Area (TDA), the large constructed stormwater
treatment wetland and the new discharge to the Cedar River would not be constructed
(Exhibit 15).
Stage 3 would increase the pollutant generating impervious surface area (PGIS) by 0.35
acre within the City of Renton. However, the Project would treat both the full 0.35 acre
of new PGIS and the remaining PGIS south of the Cedar River (Exhibit 9).
The work falls within the Cedar River drainage basin and extends from Mile Post (MP)
3.04 to MP 4.00. The project evaluation includes TDAs which represent individual
highway drainage areas that outlet to a single natural discharge location or multiple
natural discharge locations that combine within ¼ mile downstream (as determined by
the shortest flow path). I-405 runoff is collected within independent WSDOT storm
drainage systems. Those systems discharge on each side of the Cedar River. They are
considered one TDA because the outfalls combine in the Cedar River at the point along
the River just downstream of the I-405 crossing.
The WSDOT Highway Runoff Manual provides a variety of enhanced runoff treatment
BMPs that focus on removal of sediment and metals. The conceptual design proposes to
install compost-amended biofiltration swales (CABS) runoff treatment to treat 10.50
acres of highway runoff that currently flows through the spill containment pond located
between Cedar Ave S and Renton Ave S at Mile Post (MP) 3.60 (Exhibit 16). These new
facilities fall within the City of Renton Cedar Valley Aquifer Groundwater Protection
Zones 1 and would be designed in accordance with Renton Municipal Code 4-3-050
Critical Areas Regulation. A concrete liner is anticipated, and WSDOT is working through
the details of gaining approval for them to be open top to facilitate maintenance.
The existing media filter drain type 4 runoff treatment facility would remain on west side
of I-405 at MP 3.90. The spill containment pond and runoff treatment on the north side
of the Cedar River at MP 3.95 would also remain.
The projects would replace many structures within the project limits in areas of
pavement widening. Closed conveyance systems would be used as the preferred
conveyance method along the I-405 corridor due to the site constraints.
Roadway widening would require new collection structures along the new edge of
pavement. These new structures would connect to the existing drainage systems.
Existing conveyance would be modified as required to satisfy water quality treatment
and flow control measures. The conceptual design has only considered conveyance as it
relates to the feasibility of establishing collection areas for runoff treatment and flow
control. Detailed conveyance plans would be produced during the final design.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 24 of 27
Note that the final design would continue to develop these stormwater management
concepts. The design-build contract would specify performance standards based on the
Washington State Department of Transportation (WSDOT) Highway Runoff Manual
requirements. This design is one solution that would meet that standard, but this
information is subject to change during final design, using equivalent mitigation
measures.
5. Use Regulations:
a. Utilities:
Compliant if
conditions of
approval are
met
Local utility services needed to serve water-dependent and other permitted uses within
critical areas and associated buffers are subject to standards for ecological protection
and ensure that activities do not threaten public safety, cause nuisances, or destroy or
degrade critical area functions and values.
Staff Comment: A King County facility, the Cedar River Trunk Section 1, is located near
the project site (Exhibit 14). King County has a permanent easement for this facility on
the proposed development site and must be assured the right to maintain and repair the
facility. In the event that the facility must be relocated, a new permanent easement must
be provided. Construction drawing for the project would be provided to WTD when they
become available.
A portion of the project is within Zone 1 (1-year capture zone) and also in Zone 2 (5-year
capture zone) of the City’s Sole Source Aquifer Protection Area (Exhibit 11). The project
is subject to applicable City codes, development regulations and standards as described
under RMC 4-3-050 Critical Areas Regulations that are related to Wellhead Protection
Areas.
The installation of deep piling and new bridge pier adjacent to the Cedar River can
adversely impact the water quality of the shallow drinking water aquifer. Staff
recommends, as a condition of approval, that the applicant be required to install a
shallow footing system that minimizes the impact and degradation of the ground water.
In addition, the applicant would be responsible for developing and submitting to the City
a groundwater monitoring plan to monitor for the presence of contaminants resulting
from construction activities near the City’s drinking water wells. Finally, the applicant
would be accountable for developing and submitting to the City a water pollution
control, spill prevention and emergency response plans and aquifer protection measures
to be implemented during various stages of construction. Spill containment ponds shall
be made of concrete and lined with a landfill liner material. A leak detection and
monitoring system shall also be provided by WSDOT to the City of Renton.
Modifications to existing regional stormwater management facilities operated and
maintained under the direction of the City Surface Water Utility that are designed
consistent with the current version of the Washington State Department of Ecology
Wetlands and Stormwater Management Guidelines or meeting equivalent objectives.
Compliant if
conditions of
approval are
met
New utility lines and facilities may be permitted to cross water bodies in accordance
with an approved stream/lake study, if they comply with the following criteria:
i. Fish and wildlife habitat areas shall be avoided to the maximum extent possible; and
ii. The utility is designed consistent with one or more of the following methods:
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 25 of 27
CONCLUSIONS: The proposed development is consistent with the following findings pursuant to RMC section
4-3-050:
1. A proposed action meets alternative administrative standards pursuant to this Section and the proposed
activity results in no net loss of regulated riparian area or shoreline ecological function in the drainage
basin where the site is located if submitted plans are followed and the conditions of approval are met.
2. The activity will be conducted using best management practices as specified by industry standards or
applicable Federal agencies or scientific principles if submitted plans are followed and the conditions of
approval are met.
3. Impacts will be minimized and disturbed areas will be immediately restored if submitted plans are
followed and the conditions of approval are met.
4. Both onsite and offsite mitigation will be provided for this project if submitted plans are followed and
the conditions of approval are met.
(a) Installation shall be accomplished by boring beneath the scour depth and
hyporheic zone of the water body and channel migration zone; or
(b) The utilities shall cross at an angle greater than sixty (60) degrees to the centerline
of the channel in streams or perpendicular to the channel centerline; or
(c) Crossings shall be contained within the footprint of an existing road or utility
crossing; and
iii. New utility routes shall avoid paralleling the stream or following a down-valley course
near the channel; and
iv. The utility installation shall not increase or decrease the natural rate of shore
migration or channel migration; and
v. Seasonal work windows are determined and made a condition of approval; and
vi. Mitigation criteria of RMC 4-3-050L are met.
Staff Comment: The preliminary design utilizes several avoidance and minimization
opportunities including selective widening, widening to the median, and use of over
steepened slopes and retaining walls. As a condition of approval, staff is recommending
that the applicant submit monitoring reports detailing the adherence to performance
standards and success standards with respect to the preservation, enhancement and
functionality of fish and wildlife habitat to the City of Renton annually during
construction and for a period of five (5) years from project completion for City review
and comment. WSDOT would report if performance measures and success standards
have been met. If the performance measures or success standards have not been met,
the City would require adaptive management strategies to be deployed to achieve the
final success standards.
Staff also recommends, as a condition of approval, that the I-405 Tukwila to Renton
Improvement Project, Stage 3 shall be located and designed to avoid natural, historic,
archaeological or cultural resources to the maximum extent feasible and mitigate
adverse impacts where unavoidable. If any cultural resources are found all construction
activity shall stop and the owner/developer shall immediately notify the City of Renton
planning department, concerned Tribes’ cultural committees, and the Washington State
Department of Archeology and Historic Preservation.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 26 of 27
5. Compensatory mitigation projects will be monitored for a period necessary to establish that performance
standards have been met, but generally not for a period less than five (5) years, if submitted plans are
followed and the conditions of approval are met.
Development of this project shall be undertaken pursuant to the following conditions:
1. The applicant, Washington State Department of Transportation (WSDOT) Northwest Region, shall
provide a lighting plan that adequately provides for pedestrian safety and reduces artificial lighting from
I-405 Cedar River Bridge that negatively impacts juvenile salmon out-migrating from the Cedar River. The
lighting plan shall be submitted with the construction permit application to be reviewed and approved
by the Current Planning Project Manager prior to construction permit approval.
2. I-405 Tukwila to Renton Improvement Project, Stage 3 shall be located and designed to avoid natural,
historic, archaeological or cultural resources to the maximum extent feasible and mitigate adverse
impacts where unavoidable. If any Native American grave(s) or archaeological/cultural resources (Indian
artifacts) are found, all construction activity shall stop and the owner/developer shall immediately notify
the City of Renton planning department, concerned Tribes’ cultural committees, and the Washington
State Department of Archeological and Historic Preservation.
3. The applicant shall complete an inter-local agreement (ILA) for offsite mitigation planting at Ron Regis
Park. Elements of the agreement would include a detailed landscape plan with maintenance and
temporary irrigation. The ILA and detailed landscape plan shall be submitted with the construction permit
application to be reviewed and approved by the Current Planning Project Manager prior to construction
permit approval.
4. The applicant shall be required to install a shallow footing system that minimizes the impact and
degradation of the ground water. In addition, the applicant would be responsible for developing and
submitting to the City a groundwater monitoring plan to monitor for the presence of contaminants
resulting from construction activities near the City’s drinking water wells. Finally, the applicant would be
accountable for developing and submitting to the City a water pollution control, spill prevention and
emergency response plans and aquifer protection measures to be implemented during various stages of
construction. Spill containment ponds shall be made of concrete and lined with a landfill liner material.
A leak detection and monitoring system shall also be provided by WSDOT to the City of Renton.
5. The applicant shall submit monitoring reports detailing the adherence to performance standards and
success standards with respect to the preservation, enhancement and functionality of fish and wildlife
habitat to the City of Renton annually during construction and for a period of five (5) years from project
completion for City review and comment. WSDOT shall report if performance measures and success
standards have been met. If the performance measures or success standards have not been met, the City
would require adaptive management strategies to be deployed to achieve the final success standards.
This Permit is granted pursuant to the Shoreline Management Action of 1971 and pursuant to the following:
1. The issuance of a license under the Shoreline Management Act of 1971 shall not release the applicant
from compliance with federal, state, and other permit requirements.
2. This permit may be rescinded pursuant to Section 14(7) of the Shoreline Management Act of 1971 in the
event the permittee fails to comply with any condition(s) hereof.
3. Construction permits shall not be issued until twenty-one (21) days after approval by the Washington
State Department of Ecology or until any review proceedings initiated within this twenty-one (21) day
review period have been completed.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
City of Renton Department of Community & Economic Development Shoreline Management Permit
I-405, TUKWILA TO RENTON IMPROVEMENT PROJECT, STAGE 3 LUA17-000810, SM, CAR
DATE OF PERMIT: July 11, 2018 Page 27 of 27
DATE OF DECISION ON LAND USE ACTION:
SIGNATURE:
Jennifer Henning, AICP, Planning Director
Department of Community & Economic Development
Date
APPEALS: Appeals of Shoreline Substantial Development Permit issuance must be made directly to the Shorelines
Hearings Board. Appeals are made by filing a request in writing within the twenty-one (21) days of receipt of the
final order and concurrently filing copies of such request with the Washington State Department of Ecology and
the Attorney General’s office as provided in section 18(1) of the Shorelines Management Act of 1971. All copies
of appeal notices shall also be filed with the City of Renton Planning Division and the City Clerk’s office.
EXPIRATION: Unless a different time period is specified in the shoreline permit as authorized by RCW 90.58.143
and subsection J1 of RMC 4-9-190, construction activities, or a use or activity, for which a permit has been granted
pursuant to this Master Program must be commenced within two (2) years of the effective date of a shoreline
permit, or the shoreline permit shall terminate, and a new permit shall be necessary. However, the Planning
Division may authorize a single extension for a period not to exceed one year based on reasonable factors, if a
request for extension has been filed with the Planning Division before the expiration date, and notice of the
proposed extension is given to parties of record and the Washington State Department of Ecology. DEFINITION
OF COMMENCEMENT OF CONSTRUCTION ACTIVITIES: the construction applications must be submitted, permits
must be issued, and foundation inspections must be completed before the end of the two (2) year period.
Attachments: Project Exhibits 1-19
cc: Kimberly Toal / Contact
Linda Cooley / Applicant
Karen Walter / Muckleshoot Indian Tribe Fisheries Division
Ebert, Lampard, Olson, Ziegler / Parties of Record
Attorney General’s Office
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
7/11/2018 | 2:13 PM PDT
CITY OF RENTON
DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT
ADMINISTRATIVE DECISION REPORT
EXHIBITS
Project Name:
I-405, Tukwila to Renton Improvement
Project, Stage 3
Project Number:
LUA17-000810, SM, CAR
Date of Decision
July 11, 2018
Staff Contact
Clark H. Close
Senior Planner
Project Contact/Applicant
Kimberly Toal, I-405 Team /
600 108th Ave NE Suite 900,
Bellevue, WA 98004
Project Location
I-405 MP 0.0 to MP 4.0,
Cedar River Crossing,
Renton, WA 98057
The following exhibits are included with the Shoreline Management/Critical Areas Report:
Exhibit 1: Environmental (SEPA) Determination of Nonsignificance (DNS) for the I-405 Renton
to Bellevue Project
Exhibit 2: Project Description Maps
Exhibit 3: Vicinity Map
Exhibit 4: Conceptual Site Plan
Exhibit 5: Topographic Map
Exhibit 6: Tree Removal and Planting Plan
Exhibit 7: Grading Plan
Exhibit 8: Utility Plan
Exhibit 9: Summary of Stormwater Management Concepts
Exhibit 10: Geology and Soils Technical Report (dated March 2006)
Exhibit 11: City of Renton (COR) Maps – Critical Areas Maps (Aquifer Protection Areas, Flood
Areas, Flood Hazard Areas, Geologic Hazard Ares, and Regulated Slopes)
Exhibit 12: Muckleshoot Indian Tribe Fisheries Division Comments
Exhibit 13: Response Comments to the Muckleshoot Indian Tribe Fisheries Division
Exhibit 14: King County Wastewater Treatment Division (WTD) Comments
Exhibit 15: Proposed Post-Project TDA Boundaries
Exhibit 16: Impervious Area Map
Exhibit 17: Stream Buffer Mitigation at Cedar River
Exhibit 18: Cedar River Trail Reroute
Exhibit 19: Advisory Notes to Applicant
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
EXHIBIT 1
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EXHIBIT 3
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EXHIBIT 4
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EXHIBIT 5
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EXHIBIT 6
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EXHIBIT 7
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EXHIBIT 8
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dŚĞƐĐŽƉĞŽĨ^ƚĂŐĞϯ ĨĂůůƐĞŶƚŝƌĞůLJ ǁŝƚŚŝŶƚŚĞŝƚLJŽĨZĞŶƚŽŶ͘
WƌŽũĞĐƚĞƐĐƌŝƉƚŝŽŶ
dŚĞƉƌŽũĞĐƚǁŝůůĐŽŵƉůĞƚĞŽŶĞŵŽƌĞƐƚĂŐĞŽĨƚŚĞƉƌŽũĞĐƚƐƚƵĚŝĞĚŝŶƚŚĞϮϬϬϴ/ͲϰϬϱ͕dƵŬǁŝůĂƚŽZĞŶƚŽŶ
/ŵƉƌŽǀĞŵĞŶƚWƌŽũĞĐƚ;/ͲϱƚŽ^ZϭϲϵWŚĂƐĞϮͿ ŶǀŝƌŽŶŵĞŶƚĂůƐƐĞƐƐŵĞŶƚ͘dŚĞ/ͲϰϬϱ͕dƵŬǁŝůĂƚŽZĞŶƚŽŶ
/ŵƉƌŽǀĞŵĞŶƚWƌŽũĞĐƚŝŵƉƌŽǀĞƐĂƉƉƌŽdžŝŵĂƚĞůLJϰ ŵŝůĞƐŽĨ/ͲϰϬϱďĞƚǁĞĞŶ/ͲϱŝŶdƵŬǁŝůĂ;D͘W͘Ϭ͘ϬͿĂŶĚ^Z
ϭϲϵ;D͘W͘ϰ͘ϬͿŝŶZĞŶƚŽŶ͘
KƚŚĞƌ/ͲϰϬϱ͕dƵŬǁŝůĂƚŽZĞŶƚŽŶ/ŵƉƌŽǀĞŵĞŶƚWƌŽũĞĐƚƐƚĂŐĞƐĂƌĞĂƐĨŽůůŽǁƐ͗
^ƚĂŐĞϭ͕ǁŚŝĐŚĂĚĚĞĚƚŚĞЪͲĚŝĂŵŽŶĚŝŶƚĞƌĐŚĂŶŐĞĂƚ^Zϱϭϱ;dĂůďŽƚZŽĂĚͿ ĂŶĚ ǁĂƐƉƌĞǀŝŽƵƐůLJ
ĐŽŵƉůĞƚĞĚ͘
^ƚĂŐĞϮ͕ǁŚŝĐŚĂĚĚƐ,KsĚŝƌĞĐƚͲĐŽŶŶĞĐƚŽƌƌĂŵƉƐĨƌŽŵƐŽƵƚŚďŽƵŶĚ/ͲϰϬϱƚŽƐŽƵƚŚďŽƵŶĚ^Zϭϲϳ
ĂŶĚĨƌŽŵŶŽƌƚŚďŽƵŶĚ^ZϭϲϳƚŽŶŽƌƚŚďŽƵŶĚ/ͲϰϬϱ͕ĂŶĚŝƐƵŶĚĞƌĐŽŶƐƚƌƵĐƚŝŽŶǁŝƚŚĂŶĂŶƚŝĐŝƉĂƚĞĚ
ĐŽŵƉůĞƚŝŽŶŝŶϮϬϭϴ͘
^ƚĂŐĞϯ ŝƐĐƵƌƌĞŶƚůLJĨƵŶĚĞĚƚŽďĞĐŽŶƐƚƌƵĐƚĞĚĚƵƌŝŶŐƚŚĞƐĂŵĞƚŝŵĞĨƌĂŵĞĂƐƚŚĞ/ͲϰϬϱZĞŶƚŽŶƚŽ
ĞůůĞǀƵĞ/ŵƉƌŽǀĞŵĞŶƚWƌŽũĞĐƚʹ ^ƚĂŐĞϭ͘
^ƚĂŐĞϰĂŶĚŽƚŚĞƌĨƵƚƵƌĞƐƚĂŐĞƐĂƌĞƵŶĨƵŶĚĞĚĂŶĚǁŝůůďĞĐŽŵƉůĞƚĞĚĂƚĂƚŝŵĞLJĞƚƚŽďĞ
ĚĞƚĞƌŵŝŶĞĚ͘
:ƵƐƚĞĂƐƚŽĨ/Ͳϱ͕^ƚĂŐĞϯŝŵƉƌŽǀĞŵĞŶƚƐŝŶĐůƵĚĞǁŝĚĞŶŝŶŐĂůŽŶŐƐŽƵƚŚďŽƵŶĚ/ͲϰϬϱƚŽƚŚĞŝŶƐŝĚĞĨŽƌ
ĂƉƉƌŽdžŝŵĂƚĞůLJϱϬϬĨĞĞƚƚŽĞdžƚĞŶĚƚŚĞƐŽƵƚŚďŽƵŶĚ,KsůĂŶĞǁĞƐƚ͘tŝƚŚƚŚŝƐǁŝĚĞŶŝŶŐ͕ƚŚĞ,KsůĂŶĞǁŝůů
ďĞĞdžƚĞŶĚĞĚĂƉƉƌŽdžŝŵĂƚĞůLJϱϬϬĨĞĞƚƉĂƐƚƚŚĞƐƉůŝƚƚŽƚŚĞƐŽƵƚŚďŽƵŶĚ/ͲϰϬϱƚŽŶŽƌƚŚďŽƵŶĚ/ͲϱŽĨĨͲ
ĐŽŶŶĞĐƚŝŽŶ͘ƵƌƌĞŶƚůLJ͕ƚŚĞƐŽƵƚŚďŽƵŶĚ,KsůĂŶĞĞŶĚƐĂƚƚŚĞŽĨĨͲĐŽŶŶĞĐƚŝŽŶƚŽŶŽƌƚŚďŽƵŶĚ/Ͳϱ͘
ĞƚǁĞĞŶ^ZϭϲϳĂŶĚ^Zϭϲϵ͕^ƚĂŐĞϯ ŝŵƉƌŽǀĞŵĞŶƚƐŝŶĐůƵĚĞĐŽŵďŝŶŝŶŐƚŚĞƚǁŽĞdžŝƐƚŝŶŐŝŶƚĞƌŝŽƌůĂŶĞƐ
;ƚŚĞĞdžŝƐƚŝŶŐ,KsĂŶĚĂĚũĂĐĞŶƚŐĞŶĞƌĂůͲƉƵƌƉŽƐĞůĂŶĞƐͿƚŽĐƌĞĂƚĞĂŶĞǁĚƵĂůůĂŶĞĞdžƉƌĞƐƐƚŽůůƐLJƐƚĞŵŝŶ
ďŽƚŚĚŝƌĞĐƚŝŽŶƐ͘^ŽƵƚŚďŽƵŶĚ/ͲϰϬϱǁŝůůďĞǁŝĚĞŶĞĚ ƚŽƚŚĞŽƵƚƐŝĚĞŝŶĐůƵĚŝŶŐǁŝĚĞŶŝŶŐƚŚĞƐŽƵƚŚďŽƵŶĚ/Ͳ
ϰϬϱďƌŝĚŐĞŽǀĞƌƚŚĞĞĚĂƌZŝǀĞƌƚŽĂĚĚŽŶĞŶĞǁƐŽƵƚŚďŽƵŶĚůĂŶĞ͕ĂŶĚƚŚĞĞdžŝƐƚŝŶŐŶŽƌƚŚďŽƵŶĚŽƵƚƐŝĚĞ
ƐŚŽƵůĚĞƌǁŝůůďĞĐŽŶǀĞƌƚĞĚŝŶƚŽĂŶŽƌƚŚďŽƵŶĚƉĞĂŬͲƵƐĞƐŚŽƵůĚĞƌ ůĂŶĞ͘^ƚƌƵĐƚƵƌĞƐŽǀĞƌ/ͲϰϬϱĂƚĞĚĂƌ
ĂŶĚZĞŶƚŽŶǀĞŶƵĞƐǁŝůůďĞƌĞĐŽŶƐƚƌƵĐƚĞĚƚŽĂĐĐŽŵŵŽĚĂƚĞƚŚĞǁŝĚĞŶĞĚƐŽƵƚŚďŽƵŶĚ/ͲϰϬϱƌŽĂĚǁĂLJ͘
EŽƚĞƚŚĂƚƚŚĞĨŝŶĂůĚĞƐŝŐŶǁŝůůĐŽŶƚŝŶƵĞƚŽĚĞǀĞůŽƉƚŚĞƐĞƐƚŽƌŵǁĂƚĞƌŵĂŶĂŐĞŵĞŶƚĐŽŶĐĞƉƚƐ͘dŚĞĚĞƐŝŐŶͲ
ďƵŝůĚĐŽŶƚƌĂĐƚ ǁŝůů ƐƉĞĐŝĨLJ ƉĞƌĨŽƌŵĂŶĐĞ ƐƚĂŶĚĂƌĚƐ ďĂƐĞĚŽŶƚŚĞtĂƐŚŝŶŐƚŽŶ ^ƚĂƚĞ ĞƉĂƌƚŵĞŶƚ ŽĨ
dƌĂŶƐƉŽƌƚĂƚŝŽŶ;t^KdͿ ,ŝŐŚǁĂLJZƵŶŽĨĨDĂŶƵĂů ƌĞƋƵŝƌĞŵĞŶƚƐ͘dŚŝƐĚĞƐŝŐŶŝƐŽŶĞƐŽůƵƚŝŽŶƚŚĂƚǁŝůůŵĞĞƚ
ƚŚĂƚƐƚĂŶĚĂƌĚ͕ďƵƚƚŚŝƐŝŶĨŽƌŵĂƚŝŽŶŝƐƐƵďũĞĐƚƚŽĐŚĂŶŐĞĚƵƌŝŶŐĨŝŶĂůĚĞƐŝŐŶ͕ƵƐŝŶŐĞƋƵŝǀĂůĞŶƚŵŝƚŝŐĂƚŝŽŶ
ŵĞĂƐƵƌĞƐ͘
EXHIBIT 9
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
,7XNZLODWR5HQWRQ,PSURYHPHQW3URMHFW
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EXHIBIT 10
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
EXHIBIT 11
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!!
!
!
§¨¦405
§¨¦5
UV518
WesternProjectLimit
Sout
h
c
e
n
t
e
r
B
l
v
d
Klic
k
i
t
a
t
D
r
Southcenter Parkway
Tukwila Parkway
S 152nd St51st Ave S51st Ave SS 1 6 0 t h S t 62nd Ave ST U K W I L A
S E A T A C Sl
adeWayI-405 SouthboundExtend southboundHOV to west
MP 0.1
MP 0.2
MP 0.3 MP 0.4
MP 0.5
MP 0.6
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
Shoreline
FEMA 100-Year Floodplain
FEMA 500-Yr Floodplain /
0 500
Feet
Sheet 1 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Flood Hazard Areas and Shorelines
FEMA Floodway
RECEIVED
11/28/2017 cclose
PLANNING DIVISION
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!
!
!
!
!
!
!
!
!
!§¨¦405
UV167
SW 19th St Lake Ave
S
S 15th St Benson Rd
S
S Grady Wa
yRainierAveS S 6th St
S Puge
t
D
r
S 19th StShattuckAveS TalbotRdSBensonDrSEagleRidgeDrSUV515
I-405 MainlineConstruct one new lane inboth the southboundand northbound directions
MP 2.2 MP 2.3 MP 2.4 MP 2.5 MP 2.6 MP 2.7
MP 2.8
MP 2.9
MP 3.0
MP 3.1
MP 3.2
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3/
0 500
Feet
Sheet 2 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Flood Hazard Areas and Shorelines
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
Shoreline
FEMA 100-Year Floodplain
FEMA 500-Yr Floodplain
FEMA Floodway
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!
!
!
!
!
!
!
!
!
!
!
§¨¦405
UV169
I-405 SouthboundWiden bridge structureover Cedar River
Renton AveReconstruct bridge structure
Cedar AveReconstruct bridge structure
NorthernProjectLimit
William Ave SWells Ave SN 2nd St
M
aple
Valley
H
w
y
NE3rdSt
Main Ave SS 7th St
Beacon
W
ay
S
I-405 MainlineConstruct one new lanein both the southboundand northbound directions
I-40Construct one new lane inboth the southboundand northbound directions Brons o n W a y N
MP 3.2
MP 3.3
MP 3.4
MP 3.5
MP 3.6
MP 3.7
MP 3.8
MP 3.9
MP 4.0
MP 4.1
MP 4.2
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3/
0 500
Feet
Sheet 3 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Flood Hazard Areas and Shorelines
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
Shoreline
FEMA 100-Year Floodplain
FEMA 500-Yr Floodplain
FEMA Floodway
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!!
!
!
§¨¦405
§¨¦5
UV518
WesternProjectLimit
Sout
h
c
e
n
t
e
r
B
l
v
d
Klic
k
i
t
a
t
D
r
Southcenter Parkway
Tukwila Parkway
S 152nd St51st Ave S51st Ave SS 1 6 0 t h S t 62nd Ave ST U K W I L A
S E A T A C Sl
adeWayI-405 SouthboundExtend southboundHOV to west
MP 0.1
MP 0.2
MP 0.3 MP 0.4
MP 0.5
MP 0.6
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
Erosion Hazard Area
Seismic Hazard Area
Moderate HazardHigh HazardVery High Hazard
Moderate HazardHigh Hazard
/
0 500
Feet
Sheet 1 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Geologic Hazard Areas
Landslide Hazard Areas
Coal Mine Hazard Areas
RECEIVED
11/28/2017 cclose
PLANNING DIVISION
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!
!
!
!
!
!
!
!
!
!§¨¦405
UV167
SW 19th St Lake Ave
S
S 15th St Benson Rd
S
S Grady Wa
yRainierAveS S 6th St
S Puge
t
D
r
S 19th StShattuckAveS TalbotRdSBensonDrSEagleRidgeDrSUV515
I-405 MainlineConstruct one new lane inboth the southboundand northbound directions
MP 2.2 MP 2.3 MP 2.4 MP 2.5 MP 2.6 MP 2.7
MP 2.8
MP 2.9
MP 3.0
MP 3.1
MP 3.2
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3/
0 500
Feet
Sheet 2 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Geologic Hazard Areas
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
Erosion Hazard Area
Seismic Hazard Area
Moderate HazardHigh HazardVery High Hazard
Moderate HazardHigh Hazard
Landslide Hazard Areas
Coal Mine Hazard Areas
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!
!
!
!
!
!
!
!
!
!
!
§¨¦405
UV169
I-405 SouthboundWiden bridge structureover Cedar River
Renton AveReconstruct bridge structure
Cedar AveReconstruct bridge structure
NorthernProjectLimit
William Ave SWells Ave SN 2nd St
M
aple
Valley
H
w
y
NE3rdSt
Main Ave SS 7th St
Beacon
W
ay
S
I-405 MainlineConstruct one new lanein both the southboundand northbound directions
I-40Construct one new lane inboth the southboundand northbound directions Brons o n W a y N
MP 3.2
MP 3.3
MP 3.4
MP 3.5
MP 3.6
MP 3.7
MP 3.8
MP 3.9
MP 4.0
MP 4.1
MP 4.2
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3/
0 500
Feet
Sheet 3 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Geologic Hazard Areas
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
Erosion Hazard Area
Seismic Hazard Area
Moderate HazardHigh HazardVery High Hazard
Moderate HazardHigh Hazard
Landslide Hazard Areas
Coal Mine Hazard Areas
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!!
!
!
§¨¦405
§¨¦5
UV518
WesternProjectLimit
Sout
h
c
e
n
t
e
r
B
l
v
d
Klic
k
i
t
a
t
D
r
Southcenter Parkway
Tukwila Parkway
S 152nd St51st Ave S51st Ave SS 1 6 0 t h S t 62nd Ave ST U K W I L A
S E A T A C Sl
adeWayI-405 SouthboundExtend southboundHOV to west
MP 0.1
MP 0.2
MP 0.3 MP 0.4
MP 0.5
MP 0.6
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
>90%
/
0 500
Feet
Sheet 1 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Steep Slopes
Steep Slopes
>15% & <=25%>25% & <=40%>40% & <=90%
RECEIVED
11/28/2017 cclose
PLANNING DIVISION
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!
!
!
!
!
!
!
!
!
!§¨¦405
UV167
SW 19th St Lake Ave
S
S 15th St Benson Rd
S
S Grady Wa
yRainierAveS S 6th St
S Puge
t
D
r
S 19th StShattuckAveS TalbotRdSBensonDrSEagleRidgeDrSUV515
I-405 MainlineConstruct one new lane inboth the southboundand northbound directions
MP 2.2 MP 2.3 MP 2.4 MP 2.5 MP 2.6 MP 2.7
MP 2.8
MP 2.9
MP 3.0
MP 3.1
MP 3.2
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3/
0 500
Feet
Sheet 2 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Steep Slopes
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
>90%
Steep Slopes
>15% & <=25%>25% & <=40%>40% & <=90%
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
!
!
!
!
!
!
!
!
!
!
!
!
!
§¨¦405
UV169
I-405 SouthboundWiden bridge structureover Cedar River
Renton AveReconstruct bridge structure
Cedar AveReconstruct bridge structure
NorthernProjectLimit
William Ave SWells Ave SN 2nd St
M
aple
Valley
H
w
y
NE3rdSt
Main Ave SS 7th St
Beacon
W
ay
S
I-405 MainlineConstruct one new lanein both the southboundand northbound directions
I-40Construct one new lane inboth the southboundand northbound directions Brons o n W a y N
MP 3.2
MP 3.3
MP 3.4
MP 3.5
MP 3.6
MP 3.7
MP 3.8
MP 3.9
MP 4.0
MP 4.1
MP 4.2
TUKWILA
RENTON§¨¦405 UV169§¨¦5
SEATAC
1 2
UV167
3/
0 500
Feet
Sheet 3 of 3
I-405, Tukwila to Renton Improvement Project, Stage 3Steep Slopes
Legend
!Mile Post (MP)
Existing Right of Way
Muncipality
>90%
Steep Slopes
>15% & <=25%>25% & <=40%>40% & <=90%
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
1
Clark Close
From:Karen Walter <KWalter@muckleshoot.nsn.us>
Sent:Friday, December 22, 2017 9:35 AM
To:Clark Close
Subject:WSDOT I-405 Renton to Bellevue -405, Tukwila to Renton Improvement Project, Stage 3
/ LUA17-000810, Notice of Application for Shoreline Substantial Development Permit
and Critical Areas Permit
Attachments:Tabor-etal-Artif-lighting-Oct14-2010.pdf; Tabor et al Light Intensity on predation of
sockeye fry by cottids in Cedar River 2001.pdf
Clark,
We have reviewed WSDOT’s Notice of Application for the Stage 3, I-405 Tukwila to Renton project referenced above. We
have initial comments and questions as noted below:
1. Lighting on I-405 Bridge over Cedar River
With the expansion of the existing bridge crossing on the Cedar River, the applicant needs to develop a plan to
reduce artificial lighting from the bridge structure that negatively impacts juvenile salmon outmigrating from the
Cedar River (see attached). We raised this concern in our comments to the 2008 NEPA EA.
2. Tree removal along Cedar River
Additional details are needed regarding the proposed tree removal within the regulated shoreline. Specifically,
how many trees; their diameters/heights; and tree species to be removed and the functions they provide. The
proposed mitigation details that discuss how these removed trees will be mitigated, particularly for future wood
recruitment needs to be provided.
3. Stormwater improvements
Please clarify if this project will be providing further treatment of stormwater. The stormwater concepts indicate
that there will be no improvements with Stage 3; however, the project is adding pollutant generating impervious
surfaces by 0.35 acres. This increase should be fully treated as part of this project to reduce impacts to salmon in
the Cedar River.
4. Houser and BNSF bridges
The NOA mentions the Houser and BNSF bridges in the project area. It was our understanding that these bridges
may also need to be modified or replaced to implement the complete Tukwila to Renton project. Is this still the
case? If yes, when will the work occur for these bridges?
We appreciate the opportunity to comment on this proposal and look forward to the City/applicants’ responses.
Karen Walter
Watersheds and Land Use Team Leader
Muckleshoot Indian Tribe Fisheries Division
Habitat Program
Phillip Starr Building
39015-A 172nd Ave SE
Auburn, WA 98092
253-876-3116
EXHIBIT 12
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
1
Clark Close
From:Clark Close
Sent:Tuesday, March 06, 2018 9:56 AM
To:'Karen Walter'
Subject:RE: WSDOT I-405 Renton to Bellevue -405, Tukwila to Renton Improvement Project,
Stage 3 / LUA17-000810, Notice of Application for Shoreline Substantial Development
Permit and Critical Areas Permit
Attachments:C_On_Hold_Letter_180118_v1.pdf; TRIP Response to Comments_signed.pdf
Karen,
Please find attached response comments from WSDOT regarding your initial comments and questions. A hard copy of
the response comments are in the mail.
Thank you for reviewing this project.
Regards,
Clark H. Close
Senior Planner
City of Renton
425-430-7289
From: Karen Walter [mailto:KWalter@muckleshoot.nsn.us]
Sent: Friday, December 22, 2017 9:35 AM
To: Clark Close <CClose@Rentonwa.gov>
Subject: WSDOT I-405 Renton to Bellevue -405, Tukwila to Renton Improvement Project, Stage 3 / LUA17-000810,
Notice of Application for Shoreline Substantial Development Permit and Critical Areas Permit
Clark,
We have reviewed WSDOT’s Notice of Application for the Stage 3, I-405 Tukwila to Renton project referenced above. We
have initial comments and questions as noted below:
1. Lighting on I-405 Bridge over Cedar River
With the expansion of the existing bridge crossing on the Cedar River, the applicant needs to develop a plan to
reduce artificial lighting from the bridge structure that negatively impacts juvenile salmon outmigrating from the
Cedar River (see attached). We raised this concern in our comments to the 2008 NEPA EA.
2. Tree removal along Cedar River
Additional details are needed regarding the proposed tree removal within the regulated shoreline. Specifically,
how many trees; their diameters/heights; and tree species to be removed and the functions they provide. The
proposed mitigation details that discuss how these removed trees will be mitigated, particularly for future wood
recruitment needs to be provided.
3. Stormwater improvements
Please clarify if this project will be providing further treatment of stormwater. The stormwater concepts indicate
that there will be no improvements with Stage 3; however, the project is adding pollutant generating impervious
surfaces by 0.35 acres. This increase should be fully treated as part of this project to reduce impacts to salmon in
the Cedar River.
4. Houser and BNSF bridges
EXHIBIT 13
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
2
The NOA mentions the Houser and BNSF bridges in the project area. It was our understanding that these bridges
may also need to be modified or replaced to implement the complete Tukwila to Renton project. Is this still the
case? If yes, when will the work occur for these bridges?
We appreciate the opportunity to comment on this proposal and look forward to the City/applicants’ responses.
Karen Walter
Watersheds and Land Use Team Leader
Muckleshoot Indian Tribe Fisheries Division
Habitat Program
Phillip Starr Building
39015-A 172nd Ave SE
Auburn, WA 98092
253-876-3116
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
RECEIVED
03/01/2018 cclose
PLANNING DIVISION
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
Department of Natural Resources and Parks
Wastewater Treatment Division
King Street Center, KSC-NR-0505
201 South Jackson Street
Seattle, WA 98104-3855
December 20, 2017 sent via email: cclose@rentonwa.gov
Clark Close – Senior Planner
CED – Planning Division
1055 South Grady Way
Renton, WA 98057
Dear Clark Close:
The King County Wastewater Treatment Division (WTD) has received the Notice of Application
for the I-405, Tukwila to Renton Improvement Project, Stage 3 (LUA17-000810). A King
County facility, the Cedar River Trunk Section 1, is located near the project site (see
enclosed one line map showing the location of the facility). King County has a permanent
easement for this facility on the proposed development site, and must be assured the right
to maintain and repair the facility. In the event that the facility must be relocated, a new
permanent easement must be provided.
In order to protect this wastewater facility during construction, WTD requests that the City
submit construction drawings for the project, so that WTD can assess its potential impacts.
Please send drawings to:
Mark Lampard, Local Public Agency Coordinator
King County WTD, Engineering and Technical Resources
201 South Jackson Street, KSC-NR-0503
Seattle, WA 98104-3855
(206) 477-5414 / mark.lampard@kingcounty.gov
Thank you for the opportunity to review and comment on this proposal.
Sincerely,
Grace Smith
Water Quality Planner
cc: Mark Lampard, Local Public Agency Coordinator
Enclosure
EXHIBIT 14
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
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DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
EXHIBIT 15
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
EXHIBIT 16
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
INTERSTATE
405 Project TeamDESIGNED BY
ENTERED BY
CHECKED BY
PROJ. ENGR.
REGIONAL ADM.
FILE NAME
TIME
DATE 6/6/2018
c:\users\taylorsu\pw_wsdot\d0139111\XL4653_EB_Mitigation_Planting_08_RentonPark.dgn
REVISION BY
SHEET
OF
SHEETS
P.E. STAMP BOX P.E. STAMP BOX
LOCATION NO.CONTRACT NO.
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Washington State
Department of Transportation
8
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S. TAYLOR
SCIENTIFIC NAME
SYMPHORICARPOS ALBUS
SALIX SITCHENSIS
RUBUS SPECTABILIS
RUBUS PARVIFLORUS
ROSA NUTKANA
POLYSTICHUM MUNITUM
PHYSOCARPUS CAPITATUS
CORNUS SERICEA
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FRAXINUS LATIFOLIA
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THUJA PLICATA
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COMMON NAME
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SITKA WILLOW
SALMONBERRY
THIMBLEBERRY
NOOTKA ROSE
SWORD FERN
PACIFIC NINE BARK
RED-OSIER DOGWOOD
BIG LEAF MAPLE
OREGON ASH
WESTERN HEMLOCK
WESTERN RED CEDAR
DOUGLAS FIR
SIZE
SCALE IN FEET
0 25 50
CORRIDOR WIDENING & EXPRESS TOLL LANES
RENTON TO BELLEVUE
I-405
CEDAR RIVER
STREAM BUFFER MITIGATION
11.2%
11.2%
11.2%
7.5%
11.2%
7.5%
7.5%
7.5%
5.0%
4.0%
5.0%
6.2%
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% OF MIX
NOTES:
1 GAL.
1 GAL.
1 GAL.
1 GAL.
1 GAL.
1 GAL.
1 GAL.
1 GAL.
2 GAL
2 GAL
2 GAL
2 GAL
2 GAL
TO BE INSTALLED IN WETTER CONDITIONS.
TO BE INSTALLED IN DRIER CONDITIONS.
1
2
1
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2
2
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TRAIL
EXISTING
RESTORATION AREA
COR PREFFERED
30,600 SF AT 30% INFILL
PLANTING AREA
RESTORATION AREA
COR EXPANDED
STREAM BUFFER ENHANCEMENT
EXHIBIT 17
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
GrahaCn
c:\users\grahacn\pw_wsdot\d0136702\CedarRiverTrailReroute_With2018Survey.dgnPLOTTED BY:
DATE:6/1/2018 TIME:2:50:41 PM
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Department of Transportation
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SHORELINE RENTON
I-405, RENTON TO BELLEVUE EXPRESS TOLL LANES
SCALE IN FEET
0 20 40
TRAIL REVISION - PURPLE OPTION
PER 2018 SURVEYED PIER LOCATIONS; 74' MIN RADIUS
EXHIBIT 18
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
Page 1 of 2 LUA18-000810
ADVISORY NOTES TO APPLICANT
The following notes are supplemental information provided in conjunction with the administrative land use
action. Because these notes are provided as information only, they are not subject to the appeal process for
the land use action.
Planning:
(Contact: Clark Close, 425-430-7289, cclose@rentonwa.gov)
1. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, Monday through Friday unless
otherwise approved by the Development Services Division.
2. Commercial and other nonresidential construction activities shall be restricted to the hours between
seven o’clock (7:00) a.m. and eight o’clock (8:00) p.m., Monday through Friday. Work on Saturdays shall
be restricted to the hours between nine o’clock (9:00) a.m. and eight o’clock (8:00) p.m. No work shall
be permitted on Sundays.
3. Within thirty (30) days of completion of grading work, the applicant shall hydroseed or plant an
appropriate ground cover over any portion of the site that is graded or cleared of vegetation and where
no further construction work will occur within ninety (90) days. Alternative measures such as mulch,
sodding, or plastic covering as specified in the current King County Surface Water Management Design
Manual as adopted by the City of Renton may be proposed between the dates of November 1st and
March 31st of each year. The Development Services Division’s approval of this work is required prior to
final inspection and approval of the permit.
4. A National Permit Discharge Elimination System (NPDES) permit is required when more than one acre is
being cleared.
5. The applicant may not fill, excavate, stack or store any equipment, dispose of any materials, supplies or
fluids, operate any equipment, install impervious surfaces, or compact the earth in any way within the
area defined by the drip line of any tree to be retained.
6. The applicant shall erect and maintain six foot (6') high chain link temporary construction fencing around
the drip lines of all retained trees, or along the perimeter of a stand of retained trees. Placards shall be
placed on fencing every fifty feet (50') indicating the words, “NO TRESPASSING – Protected Trees” or on
each side of the fencing if less than fifty feet (50'). Site access to individually protected trees or groups
of trees shall be fenced and signed. Individual trees shall be fenced on four (4) sides. In addition, the
applicant shall provide supervision whenever equipment or trucks are moving near trees.
7. This permit is shall comply with the Bald and Golden Eagle Protection Act. The permitted is responsible
for adhering to the U.S. Fish and Wildlife Service National Bald Eagle Management Guidelines (2007) and
/or your U.S. Fish and Wildlife Service permit.
Development Engineering:
(Contact: Justin Johnson, 425-430-7291, JTJohnson@rentonwa.gov)
1. The installation of new piers in the Cedar River floodplain for the widening of the bridge over the Cedar
River will require a zero-rise floodplain hydraulic analysis to demonstrate no increase in the 100-year
floodplain. Compensatory storage would be required for any fill placed in the 100-year floodplain as
required by the COR critical areas ordinance and the Renton Surface Water Design Manual.
2. According to WSDOT Environmental Manual M 31-11.17 Chapter 433 Groundwater, a full Discipline
Report is required when one or more project alternatives may introduce enough stormwater or
wastewater into an aquifer or its recharge zone to create a significant adverse environmental impact.
EXHIBIT 19
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
ADVISORY NOTES TO APPLICANT
Page 2 of 2 LUA18-000810
The proposed improvements include the installation of stormwater facilities and of bridge support
piles that are located within the one-year capture zone (Zone 1) of the City’s sole source aquifer.
Therefore, the City requests WSDOT to submit the full Discipline Report for our review and comments.
3. See also attached Development Engineering Memo dated March 27, 2018.
Fire Authority:
(Contact: Corey Thomas, 425-430-7024, cthomas@rentonwa.gov)
1. Reviewed.
Technical Services:
(Contact: Amanda Askren, 425-430-7369, aaskren@rentonwa.gov)
1. Reviewed.
Community Services:
(Contact: Leslie Betlach, 425-430-6619, lbetlach@rentonwa.gov)
1. See attached Community Services Department Memorandum with preferred planting location map
dated March 8, 2018.
2. See attached Community Services Department Memorandum dated March 16, 2018.
Police:
(Contact: Cyndie Parks, 425-430-7521, cparks@rentonwa.gov)
1. Reviewed.
Building:
(Contact: Craig Burnell, 425-430-7290, cburnell@rentonwa.gov)
1. Recommendations of the geotechnical report must be followed.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
M E M O R A N D U M
DATE:March 27, 2018
TO:Clark Close, Senior Planner
FROM:Justin Johnson, Civil Plan Reviewer
SUBJECT:Utility and Transportation Comments for WSDOT
LUA18-000810
I have completed a preliminary review of the application for the Tukwila to Renton Stage 3 project.
WATER COMMENTS
A portion of the project is within Zone 1 (1-year capture zone) and also in Zone 2 (5-year capture zone)
of the City’s Sole Source Aquifer Protection Area. The project is subject to applicable City codes,
development regulations and standards as described under RMC 4-3-050 Critical Areas Regulations that
are related to Wellhead Protection Areas.
1. New bridge piers near Cedar River
The installation of deep piling and piers adjacent to the Cedar River can adversely impact the
water quality of the shallow drinking water aquifer. The applicant will need to install a shallow
footing system that minimizes the impact and degradation of the ground water.
2. Groundwater monitoring plan
The applicant shall develop and submit to the City a groundwater monitoring plan to monitor for
the presence of contaminants resulting from construction activities near the City’s drinking
water wells.
3. Water pollution, spill prevention and emergency response plan
The applicant shall develop and submit to the City a water pollution control, spill prevention and
emergency response plans and aquifer protection measures to be implemented during various
stages of construction. Spill containment ponds shall be made of concrete and lined with a
landfill liner material. A leak detection and monitoring system shall be provided.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
WSDOT Tukwila to Renton Stage 3 – LUA18-000810
Page 2 of 6
March 27, 2018
SEWER COMMENTS
1. Applicant will need to protect all Sewer utilities during construction.
STORM DRAINAGE COMMENTS
1. Drainage plans and a drainage report complying with the adopted 2017 Renton Surface Water
Design Manual will be required.
2. Outfalls into the Cedar River shall be designed and sized in accordance with standards found in
Chapter 4 of the 2017 Renton Surface Water Design Manual and shall account for future runoff
from the total upstream tributary area. Outfalls should be provided with adequate energy
dissipation / erosion protection.
3. Within the floodway, encroachments including fill, new construction, substantial improvements,
and other development are prohibited unless certification by a registered professional engineer
demonstrates through hydrologic and hydraulic analyses performed in accordance with
standard engineering practice that encroachments shall not result in any increase in flood levels
during the occurrence of the base flood discharge, there are no adverse impacts to the subject
property or abutting or adjacent properties, there are no higher flood elevations upstream, and
the impact due to floodway encroachment shall be analyzed using future land use condition
flows.
4. Future flow conditions should be considered for proposed bridge proposals crossing floodways.
5. WSDOT will need to provide a zero-rise hydraulic analysis of the existing and proposed site
conditions within the floodplain of the Cedar River per section 4.4.2 of the 2017 City of Renton
Surface Water Design Manual. The existing condition shall be based on the 2017 Preliminary
FEMA DFIRM Floodplain/Floodway data.
6. If grading, filling, or other activity will reduce the effective storage volume of the floodplain,
compensatory storage shall be created per section 4-3-050 of the Renton Municipal Code
(RMC).
7. The project shall not result in any change to the floodplain or floodway.
8. The design and construction of the proposed storm drainage system within the City’s Wellhead
Protection Areas shall meet the requirements of Sections 4-3-050, 4-4-030 and 4-9-015 of the
Renton Municipal Code (RMC). Open facilities such as flow control and water quality treatment
ponds, stormwater infiltration facilities, are prohibited in Zone 1 of the City’s Aquifer Protection
Area (APA).
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
WSDOT Tukwila to Renton Stage 3 – LUA18-000810
Page 3 of 6
March 27, 2018
TRANSPORTATION/STREET COMMENTS
1. When installing the new column, the Applicant will need to ensure that access to the trail remains
open at all times.
GENERAL COMMENTS
1. The fees listed are for 2017. The fees that are current at the time of the respective permit issuance
will be levied. Please see the City of Renton website for the current development fee schedule.
2. Retaining walls that are 4’ or taller from bottom of footing and stormwater detention vaults will
require a separate building permit. Structural calculations and plans prepared by a licensed
engineer will be required as part of the building permit review.
3. All civil plans shall conform to the current City of Renton survey and drafting standards. Current
drafting standards can be found on the City of Renton website.
4. A separate plan submittal will be required for a construction permit for utility work and street
improvements. All plans shall be prepared by a licensed Civil Engineer in the State of Washington.
5. Please see the City of Renton Development Engineering website for the Construction Permit
Application and Construction Permit Process and Submittal Requirements. Please contact the City
to schedule a construction permit intake meeting.
6. All plan review for the City is now paperless. Please see http://rentonwa.gov/paperless/ for more
information.
DocuSign Envelope ID: 31F77156-1DE0-4655-80C3-A1FC81D83C22
i:\2005\12\memos\ajs\standardmemo.doc
COMMUNITY SERVICES
DEPARTMENT
M E M O R A N D U M
DATE:March 8, 2018
TO:Clark Close, Senior Planner
CC:Kelly Beymer, Administrator
Leslie Betlach, Director of Parks Planning and Natural Resources
Division
FROM:Terry Flatley, Urban Forestry and Natural Resources Manager
SUBJECT:Review of LUA17-000810
The site map submitted by WSDOT memorandum of February 28, 2018 regarding I-405, Tukwila
to Renton Improvement Project, Shoreline Substantial Development Permit Application for LUA-
17-000810 should be deleted and the most recent version submitted (see the attached map).
The old map provided in this review was used to designate a general area for consideration and
does not show the City’s preferred location. This older map shows the general area in blue
highlights and a more specific area in red highlights. The red highlighted area is not the
preferred location but is further east of that red highlighted area.
At this time, I have not seen a map from WSDOT of the specific planting area, however, they
sent another generalized map of the area I forwarded to you on March 7, 2018.
The attached map provides the specific planting location that is preferred by the City. That area
is highlighted in a red boundary and is approximately 25,000 square feet in size. A purple
highlighted area is also included in the case more area is needed for planting due to the request
by the City for wider tree spacing than traditionally used when planting for a forest timber crop.
Combined, the two areas are bounded on the west and east by soft surface trails. Both areas are
delineated north of the 100-year flood survey.
In relation to this information, the City requests WSDOT submit the following:
Planting plan
Maintenance plan
Temporary irrigation plan
An Inter-local Agreement for this mitigation planting project
Attachment: COR Preferred Planting Location Map.pdf
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4,514
376
COR Preferred Planting Location Map
This map is a user generated static output from an Internet mapping site and
is for reference only. Data layers that appear on this map may or may not be
accurate, current, or otherwise reliable.
None
3/8/2018
Legend
2560128
THIS MAP IS NOT TO BE USED FOR NAVIGATION
Feet
Notes
256
WGS_1984_Web_Mercator_Auxiliary_Sphere
Information Technology - GIS
RentonMapSupport@Rentonwa.gov
City and County Boundary
Addresses
Parcels
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COMMUNITY SERVICES
DEPARTMENT
M E M O R A N D U M
DATE: March 16, 2018
TO: Clark Close, Senior Planner, CED
CC: Kelly Beymer, Administrator
Leslie Betlach, Parks Planning and Natural Resources Director
Steve Brown, Parks Maintenance Manager
FROM: Cailín Hunsaker, Parks and Trails Director
SUBJECT: LUA17-000810, SM, CAR; Hunsaker Comments
I-405, Tukwila to Renton Improvement Project
Page 1, Item 1:
Response from Community Services Department, Parks and Trails Division:
We are not sure that the sleeve-like attachments referenced are still in place as
described. Those attachments (installed by others) showed signs of failure
following their installation. For maintenance purposes we would suggest the
installation of a completely different fixture that conforms to the lighting
requirements referenced without the need of a non-factory produced attachment.
Also the statement that “all lighting underneath the bridge is owned and operated
by the City of Renton” is inaccurate. There are four (4) fixtures on the north end
of the bridge that are not city owned or maintained.
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