HomeMy WebLinkAboutPN_Project_Narrative_240513_v1.pdf
5/10/2024
City of Renton Permit Services
1055 South Grady Way, 6th Floor
Renton, WA 98055
(425) 430-7200
permittech@rentonwa.gov
Renton Municipal Airport Taxiway A Rehabilitation and Associated Improvements
Shoreline Exemption Submittal
Project Narrative
To Whom It May Concern:
The City of Renton (City) has contracted Century West Engineering Corporation (Century West) to
complete engineering design for the Renton Municipal Airport Taxiway A Rehabilitation and Associated
Improvements (project). As part of the project design services, Century West is assembling the project
shoreline exemption submittal. A shoreline exemption submittal is necessary for this project, due to the
project’s proximity to Lake Washington and the Cedar River. The property is bordered by Lake
Washington to the north and Cedar River to the east. There are no other ‘special site features’ (i.e.,
wetlands, steep slopes).
The project involves the following construction items at the Airport:
· Rehabilitation of pavement on the existing parallel Taxiway A, and connector taxiways A1,
A2, A3, A4, A5, A6 and A7.
· Rehabilitation of the existing apron service road pavement to the west of Taxiway A.
· Rehabilitation of the existing sea plane ramp pavement to the north of Taxiway A.
· Replacement of existing Taxiway A edge lighting with new LED lights.
· Removal/abandonment of the existing fire water line beneath Taxiway A, that is leaking and
beyond its useful life, and reconfiguration of fire waterline feed to Boeing Fuel Farm building
adjacent Perimeter Road.
· Minor infield grading and drainage improvements between Taxiway A and Runway 16/34.
· Replacement/relocation of existing taxiway lighted guidance signage, as needed, to support
taxiway and infield improvements.
The entire Airport lot is approximately 152.5 acres. All work will occur within the built environment and
there will be no increase in the area of impervious surface. The rehabilitated paved areas will be replaced
in kind. The project will rehabilitate 17.7 acres of existing asphalt. Rehabilitation of roads and taxiways
will include the replacement of existing asphalt pavement, which is failing, with engineered structural
pavement section materials (e.g., asphalt, crushed aggregate, cement).
The current zoning of the site is Industrial Medium (IM), and adjacent properties are zoned as Urban-
Center-2 (UC-2) and Commercial Arterial (CA). The project is in accordance with this zoning designation
and will not change the Airport property use in any way. Special site features include the proximity of
Lake Washington and the Cedar River.
The total estimated construction cost is approximately $20,000,000 and the estimated fair market value of
the proposed project is not applicable.
The project will rehabilitate 17.7 acres of existing asphalt, and include up to 3.1 acres of infield grading.
Within the limits of pavement rehabilitation, excavation will only occur within the depth of the existing
pavement section (no soils will be imported or exported as part of the pavement rehabilitation project
element). Fill material associated with the pavement rehabilitation will be engineered structural pavement
materials (e.g., asphalt, crushed aggregate) and will be imported from an approved offsite sources. Within
the limits of infield grading, the earthwork is estimated to result in 2,659 CY of cut and 1,714 CY fill,
resulting in approximately 517 CY of excess native material that will be hauled off-site, to an
undetermined site, and disposed of by the contractor. Additionally, a limited quantity of temporary
excavation will occur as part of trenching related to the electrical replacement and fire waterline project
elements. Native subgrade materials excavated during construction of these project elements will be
temporarily stockpiled and used as backfill once electrical systems are replaced and the fire waterline is
removed/modified.
According to the Project’s geotechnical report (GeoSciences, 2023) “the project site soil is mapped as
artificial fill and modified land…fill soils were placed in the historic river channel, nearby wetlands, and
the local flood plain to create usable land for development.” The fill material at the site is primarily
composed of dense, sandy gravel.
Portions of the project will occur within the 200-foot shoreline jurisdiction of Lake Washington. All work
will be outside of the 200-foot shoreline jurisdiction of the Cedar River. Lake Washington is classified as
a Shoreline of Statewide Significance (Type S) per RMC 4-3-090 and is regulated under Renton’s
Shoreline Master Program regulations. The project will be confined entirely to the Airport property within
the existing built environment and will not occur in areas with existing trees or riparian vegetation. No
direct or indirect impacts on riparian vegetation or trees will occur as a result of the project.
No existing bulkheads or bank armoring are present. The project will not obstruct any views. This project
will not impact the number, size, and density of lots.
If you have any questions please feel free to contact me at greince@centurywest.com.
Sincerely,
Greg Reince, P.E.
Project Manager