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November 17, 2017
Mr. Clark Close, Senior Planner
City of Renton, Department of Community and Economic Development
Planning Division
1055 South Grady Way
Renton, WA 98057
Re: Critical Areas Permit Application
I-405, Renton to Bellevue Project, Stage 1
Dear Mr. Close:
The Washington State Department of Transportation (WSDOT) is submitting this application for a Critical Areas Permit for the I-405, Renton to Bellevue Project (Project).
The Renton to Bellevue Project (Stage 1) extends along I-405 for approximately 8 miles from the SR 169 interchange (MP 3.8) in Renton to the I-90 interchange (MP 11.9) in Bellevue. The
project proposes the following improvements, with affected critical areas in bold:
Northbound and Southbound I-405 (MP 3.8 – MP 11.9): Widen I-405 from SR 169 to just north of I-90 to accommodate an extra lane in each direction. Landslide, Erosion, Floodplain, Seismic,
Aquifer Zones, Streams/Wetlands
Sunset Boulevard N (MP 4.53) and NE Park Drive (MP 5.42) Interchanges: At Sunset Boulevard, widen the I-405 northbound and southbound bridge structures. At NE Park Drive, widen the I-405
southbound bridge structure. Aquifer Zone 2, Landslide, Erosion
NE 30th Street (MP 6.52): Replace the local road overpass abutment slopes with retaining walls on both sides of I-405 to accommodate widening. Add an auxiliary lane on southbound I-405
just north of NE 30th. Aquifer Zone 2
May Creek Bridges (MP 7.18): Replace the northbound and southbound I-405 bridge structures over May Creek and provide habitat improvements to the riparian corridor by removing angular
rock fill material. Floodplain, Seismic, Streams/Wetlands
NE 44th Street Interchange (MP 7.48): Replace the local road bridge structure and reconstruct the interchange. Construct new direct access ramps for transit and ETL users in the I-405
median. Reconstruct Lake Washington Boulevard NE between NE 44th Street and SE 76th Street, and realign the northbound on-ramp to I-405 to connect to Lake Washington Boulevard NE. Construct
an at-grade park-and-ride lot on the corner of Lake Washington Boulevard N and NE 44th Street. The park-and-ride will have a minimum of 200 parking stalls. Streams/Wetlands
Lake Washington Trail (MP 7.35 – MP 10.25): Realign and reconstruct the existing trail west of its current location to reside within the Eastside Rail Corridor from Ripley Lane in Renton
to Coal Creek Parkway in Bellevue. Landslide, Seismic, Erosion, Steep Slopes
Associated noise wall construction, stormwater management and water quality facilities upgrades, and fish passage improvements will be part of the project and if they affect critical
areas will be included with the rest of the information provided in this application.
Project work areas at Johns and May Creeks are located within floodplains.
The majority of potential adverse effects associated with the construction and operation of the project in geologic hazard areas will be avoided or minimized through the use of BMPs.
WSDOT contractors will also be following the procedures outlined in the WSDOT Geotechnical Design Manual (GDM) and Bridge Design Manual, and from following the I-405 Programmatic Commitments.
Refer to Attachment 9 – Geology and Soils Report for additional details. Mitigation for floodplain impacts and streamflow are addressed in Attachments 8 - Flood Risk Analysis and Attachment
10 - Stormwater Management Concept. Impacts to wetland and stream buffers will be mitigated as described in the Wetland and Stream Mitigation Report.
The following application materials are enclosed for your review:
Land Use Permit Master Application Form
Attachment 1 – Vicinity Map
Attachment 2 – Conceptual Site Plan
Attachment 3 – Topographic Map (refer to Conceptual Site Plans)
Attachment 4 – Critical Areas Maps
Attachment 5 – Tree Removal and Restoration Plan
Attachment 6 - Wetland and Stream Assessment Report
Attachment 7 - Wetland and Stream Mitigation Report
Attachment 8 – Flood Risk Analysis
Attachment 9 – Geology and Soils Report
Attachment 10 – Stormwater Management Concept
Attachment 11 – Grading Plan
WSDOT requests that the City of Renton, Department of Community and Economic Development, bill any fees above and beyond the required deposit for review of this application to WSDOT
at the address provided on the enclosed Land Use Permit Application form.
Please contact Kimberly Toal at (425) 450-2721 or ToalK@consultant.wsdot.wa.gov if there are any questions about this application.
Sincerely,
Linda Cooley
Environmental Permit Compliance Lead