HomeMy WebLinkAboutD_Cedar River Outfall Culver Repair_FINALDEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
D_Cedar River Outfall Culver Repair_FINAL
PLANNING DIVISION
CERTIFICATE OF EXEMPTION
FROM SHORELINE SUBSTANTIAL DEVELOPMENT
EVALUATION FORM & DECISION
DATE OF DECISION: June 20, 2023
PROJECT NUMBER: LUA23-000198, SME
PROJECT NAME: PW SWP #27-4030 Cedar River Outfall Culvert Repair
PROJECT MANAGER: Jill Ding, Senior Planner
APPLICANT/OWNER: Chester Bennett, City of Renton
1055 S Grady Way, Renton, WA 98057
PROJECT LOCATION: 1100 W Perimeter Rd and 1060 Nishiwaki Ln, Renton, WA 98057
PROJECT DESCRIPTION: The applicant is requesting a Shoreline Exemption and State Environmental Policy Act
(SEPA) Exemption for the repair of defects in stormwater culvert pipes that pass under the left (west) and right
(east) banks of the Cedar River Levee between the Logan Ave Bridge and the mouth of the Cedar Rive r at Lake
Washington. In total seven (7) culverts are proposed for repair and rehabilitation. Six (6) of the culverts are located
along the left bank (west bank). One (1) culvert is located along the right bank (east bank). The proposed repairs
would utilize a Cured-In-Place-Pipe (CIPP) repair method. This will allow for trenchless construction and no
disturbance to the levee prism and minimal or zero earthwork and excavation requirements upstream and
downstream of each culvert. No new structures will be installed or constructed. Due to fluctuations in the water
surface elevation the project may need to install stormwater diversion structures or cofferdams to allow for access
and successfully installation of the CIPP liner. The project site is located within the high intensity designation of the
Cedar River, Reach A.
SEC-TWN-R: SE 07-23-05
WATER BODY/REACH: Cedar River, Reach A
EXEMPTION JUSTIFICATION/DECISION: An exemption from a Shoreline Management Substantial Development
Permit is hereby Approved on the proposed project in accordance with RMC.4.9190C “Exemption from Permit
System” and for the following reasons:
Normal maintenance or repair of existing structures or developments, including damage by accident, fire or
elements. "Normal maintenance" includes those usual acts to prevent a decline, lapse, or cessation from a lawfully
established condition. "Normal repair" means to restore a development to a state comparable to its original
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
City of Renton Department of Community & Economic Devel opment Certificate of Exemption From Shoreline Substantial Development
PW SWP #27-4030 Cedar River Outfall Culvert Repair LUA23-000198, SME
Permit Date: June 20, 2023 Page 2 of 3
D_Cedar River Outfall Culver Repair_FINAL
condition, including but not limited to its size, shape, configuration, location and external appearanc e, within a
reasonable period after decay or partial destruction, except where repair causes substantial adverse effects to
shoreline resource or environment. Replacement of a structure or development may be authorized as repair where
such replacement is the common method of repair for the type of structure or development and the replacement
structure or development is comparable to the original structure or development including but not limited to its
size, shape, configuration, location and external appearance and the replacement does not cause substantial
adverse effects to shoreline resources or environment.
Staff Comment: The proposed culvert repair would qualify as maintenance and repair of an existing structure.
This proposal does not require an environmental threshold determination as it meets the following exemption
criteria in accordance with WAC 197-11-800(3) “Categorical Exemptions”:
Repair, remodeling and maintenance activities. The following activities shall be categorically exempt: The repair,
remodeling, maintenance, or minor alteration of existing private or public structures, facilities or equipment,
including utilities, recreation, and transportation facilities involving no material expansions or changes in use
beyond that previously existing; except that, where undertaken wholly or in part on lands covered by water, only
minor repair or replacement of structures may be exempt (examples include repair or replacement of piling, ramps,
floats, or mooring buoys, or minor repair, alteration, or maintenance of docks).
Staff Comment: The proposed culvert repair would qualify as maintenance and repair of an existing structure. No
material expansions or changes of use are proposed.
FINDINGS: The proposed development is:
i. Consistent with the policies of the Shoreline Management Act.
ii. Consistent with the City of Renton Shoreline Mater Program.
SIGNATURE & DATE OF DECISION:
_____________________________________ ______________________________
Vanessa Dolbee, Planning Director Date
RECONSIDERATION: Within 14 days of the decision date, any party may request that the decision be reopened by
the approval body. The approval body may modify his decision if material evidence not readily discoverable prior
to the original decision is found or if he finds there was misrepresentation of fact. After review of the
reconsideration request, if the approval body finds sufficient evidence to amend the original decision, there will be
no further extension of the appeal period. Any person wishing to take further action must file a formal appeal within
the 14-day appeal time frame.
APPEALS: This administrative land use decision will become final if not appealed in writing to the Hearing
Examiner on or before 5:00 PM on July 5, 2023. An appeal of the decision must be filed within the 14-day appeal
period (RCW 43.21.C.075(3); WAC 197-11-680). Appeals must be submitted electronically to the City Clerk at
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
6/20/2023 | 11:21 AM PDT
City of Renton Department of Community & Economic Devel opment Certificate of Exemption From Shoreline Substantial Development
PW SWP #27-4030 Cedar River Outfall Culvert Repair LUA23-000198, SME
Permit Date: June 20, 2023 Page 3 of 3
D_Cedar River Outfall Culver Repair_FINAL
cityclerk@rentonwa.gov or delivered to City Hall 1st floor Lobby Hub Monday through Friday. The appeal fee,
normally due at the time an appeal is submitted, will be collected at a future date if your appeal is submitted
electronically. The appeal submitted in person may be paid on the first floor in our Finan ce Department. Appeals
to the Hearing Examiner are governed by RMC 4-8-110 and additional information regarding the appeal process
may be obtained from the City Clerk’s Office, cityclerk@rentonwa.gov.
EXPIRATION: Two (2) years from the date of decision (date signed).
Attachments: Project Narrative, Site Plan
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
Location #1PN: 0723059007Waterway PN: 072305HYDRLocation #2PN: 0723059007Waterway PN: 072305HYDRLocation #3PN: 0723059007Waterway PN: 072305HYDRLocation #4PN: 0723059007Waterway PN: 072305HYDRLocation #5PN: 0723059007Waterway PN: 072305HYDRLocation #6PN: 0723059007Waterway PN: 182305HYDRLocation #7Boeing PN: 0723059001 School District PN: 0723059085 Waterway PN: 182305HYDRNLogan Ave NN 6th StPN:0723059001PN:0723059001PN:0723059007PN:0723059085PN:0723059053Cedar River Culvert Outfall Repair ProjectVicinity Map6/5/2023PN:0723059096CEDAR RIVERCEDAR RIVERDocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
City of Renton Project No: 27-4030
Project Narrative
City of Renton: Cedar River Outfall Culvert Repair Project Page 1 of 4
Project Name: Cedar River Outfall Culvert Repair and Rehabilitation
Contract: TBD
City Project No: 27-4030
Department: Surface Water Utility
Project Manager: Chester Bennett
Date Updated: 6/5/2023
Project Narrative
Project Objective
This project will repair defects in stormwater culvert pipes that pass under the left (west) and
right (east) banks of the Cedar River Levee between the Logan Ave Bridge and the mouth of the
Cedar River at Lake Washington.
These repairs will increase the life of the existing culverts, improve the structural integrity and
likelihood of failure, and thus prevent potential material loss from the earthen embankments
and floodwalls that comprise the levee system. These efforts will meet maintenance and safety
requirements for the levee system and continue to provide protection from the 100-year storm
event for properties and infrastructure along the Cedar River Levee Section 205.
Summary
The defects in the culverts were identified during camera / video inspections performed in 2022
with Closed Circuit Television (CCTV) equipment by the City of Renton and confirmed and
reviewed by the United States Army Corps of Engineers (USACE).
In total seven (7) culverts are proposed for repair and rehabilitation.
Six (6) of the culverts are located along the left bank (west bank).
One (1) culvert is located along the right bank (east bank).
The culverts convey surface stormwater from the surrounding roadways, parking lots, and
vegetated park areas within the drainage basin along the lower 1.25 miles of the Cedar River.
Details of the culverts are as follows:
The average culvert length is 66 feet and ranges from 20 to 165 feet.
The existing host pipe diameters range from 12 inches to 24 inches.
Host pipe material consists of Reinforced Concrete Pipe (RCP) and Corrugated Metal
Pipe (CMP).
All culverts have backflow / check valves at the downstream end that were installed in
2016.
The defects at each location are isolated to one run of pipe between an upstream
drainage structure and the downstream pipe end outfall to the Cedar River.
The defects range from offset and separated joints, cracks, and small to medium sized
holes.
According to the USACE inspection report all defects in the culverts proposed for repair
were assigned a rating of “Minimally Acceptable”.
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
City of Renton Project No: 27-4030
Project Narrative
City of Renton: Cedar River Outfall Culvert Repair Project Page 2 of 4
The City of Renton is proposing repairs and rehabilitation using a Cured-In-Place-Pipe (CIPP)
repair method. This will allow for trenchless construction and no disturbance to the levee prism
and minimal or zero earthwork and excavation requirements upstream and downstream of each
culvert. No new structures will be installed or constructed. This is a repair and maintenance
activity related to the stormwater conveyance system and to maintain the Cedar River Levee
System.
The specifications and project documents stipulate no toxins, effluent, or material with
properties (hot water included) that are harmful to aquatic life and habitat shall be discharged
or allowed to enter the stormwater system, surface water bodies, or surrounding waters and
areas.
Access will be taken from the landside at all locations. Access will be available by public right of
way or from the City of Renton Airport property at Locations #1 - #6. At Location #7 a temporary
construction and access easement will be needed for two parcels adjacent to the work site.
Access will be needed from the Renton School District on parcel number 0723059085. An
easement will also be needed from Boeing for access to the upstream structure and a work area
on parcel number 0723059001.
In some locations the water surface elevation of the Cedar River may be above or at the invert
of the culverts proposed for repair. The CIPP repair method requires open and clear access free
of water at the downstream end of the pipe. Due to fluctuations in the water surface elevation
the project may need to install stormwater diversion structures or cofferdams to allow for
access and successfully installation of the CIPP liner.
Project Timeline
June 26th – Construction Contract Advertisement
July 6th – Construction Contract Award
July 24th – Start Construction
August 31st – End Construction
Project Details
Roles:
1. Design documents, plans, specifications, and exhibit to be performed by City of Renton Staff
a. Project Manager - Chester Bennett, PE
Consultants:
1. None.
Permitting Requirements
1. Hydraulic Project Approval
2. Shoreline Exemption Permit
3. SEPA Categorical Exemption for maintenance activity
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
City of Renton Project No: 27-4030
Project Narrative
City of Renton: Cedar River Outfall Culvert Repair Project Page 3 of 4
Background
The Cedar River levees were designed by the USACE in the mid-1990s, and their construction
began in April 1999. In December 2000, the flood control was complete.
The Cedar River levees are part of the Cedar River Section 205 Flood Damage Reduction project,
constructed in cooperation with the USACE. The levees are located on the lower 1.25 miles of
the Cedar River and extend from Williams Avenue N to the mouth of the Cedar River at Lake
Washington. The Cedar River 205 project protects portions of downtown Renton, The Boeing
Company’s 737 plant, and the Renton Municipal airport from the 100-year flood.
At the time of completion of the levees in December of 2000 the obligations for operation and
maintenance were transferred to the City of Renton. The USACE started certification of this
levee system in 2004 which allows for adjacent areas (listed above) to be mapped as outside of
the FEMA 100-year floodplain critical area. However, in July of 2012 the USACE informed the
City that the certification previously issued by the USACE would expire in August 2013.
The City of Renton participates in annual inspections of the Cedar River Levee Section 205 with
the USACE to identify concerns and activities to maintain the current certification and
qualification for the USACE PL84-99 program.
Additionally, the City is responsible for managing the necessary certification of the levee system
to keep current FEMA floodplain mapping unchanged. Maintenance and inspections ensure
compliance with FEMA accreditation to offer sufficient protection to keep the areas in the lower
1.25 miles of the Cedar River outside of the 100-year floodplain.
Project Work – Completed
Plans and Exhibits
Technical exhibits and GIS maps have been prepared and finalized which show:
The culverts that require repair and their lengths and diameter
The general vicinity and location of the culverts.
Recent site visit photos for all reasonably accessible culverts upstream and downstream
inverts.
Access routes to the locations.
Approximate areas anticipated to be used that will facilitate CIPP repairs.
Specials, Specifications, & Engineers Estimate
Specials for the project have been reviewed and prepared to specify the repair method as well
as products, submittals, and environmental risks and mitigation for the work.
Project Work – Current and Ongoing
Temporary Construction Easement (TCE) Agreements
TCE negotiations with Renton School District and The Boeing Company are currently in progress.
Draft agreements have been reviewed by City of Renton Legal and sent to both entities. They
are in Boeing’s and RSD’s court for comment and review. The proposed easement on the RSD
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9
City of Renton Project No: 27-4030
Project Narrative
City of Renton: Cedar River Outfall Culvert Repair Project Page 4 of 4
parcel will provide the best access with the least amount of disruption to public access and City
or Renton Parks properties. The easement on the Boeing parcel is required to complete the
repair of the culvert as the upstream drainage structure is completely located on the Boeing
property and is collecting and conveying only Boeing stormwater runoff.
Permitting
Shoreline Exemption permit will be submitted to the City of Renton CED Planning division by the
Public Works Surface Water department and will include acknowledgement of a categorical
exemption from SEPA requirements as the project is considered maintenance on existing
infrastructure.
DocuSign Envelope ID: 6162E679-DE09-4A62-829B-8B847888DDF9