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HomeMy WebLinkAboutPN_Bosair_Hangar_Demolition_210914_v1.pdf PROJECT NARRATIVE SEPA Review Ace Aviation 400, 450, and 500 Perimeter Road Renton, WA 98057 Prepared by: Barghausen Consulting Engineers, Inc. September 13, 2021 Our Job No. 15559 1 15559.003-Narrative.docx Project Overview The project proposes demolition of three airplane hangars on a lease area located at 400, 450, and 500 Perimeter Road in Renton, Washington. The project site is part of the Renton Municipal Airport and is located on the southeast corner of Parcel No. 072305-9007. The entire airport site totals 167 acres in area. The Cedar River is located to the east of the project site. The project site is currently zoned as Medium Industrial (IM), and the existing land use is aircraft storage. Property to the east of the project site is zoned Center Downtown (CD), property to the south of the site is zoned Commercial Arterial (CA), and the area to the west and north of the project site is zoned Medium Industrial (IM). No changes are proposed to the zoning or land use of the site. A SEPA review will be required for demolition of buildings greater than 4,000 square feet. Site Design and Orientation The three hangars located at 400, 450, and 500 Perimeter Road are approximately 5,566 square feet, 6,486 square feet, and 8,188 square feet, respectively. The smallest hangar, located at 400 Perimeter Road, is the furthest west, and the largest hangar, located at 500 Perimeter Road, is the furthest east. They are all located adjacent to the north side of P erimeter Road. Access is provided from Perimeter Road via an all- access driveway on the west side of the site. Parking is provided on the east side of the project site, just east of the 8,188-square-foot hangar. Construction and Soils The soils on the project site are classified as Urban Land by King County. The Geotechnical Report prepared by Terra Associates, Inc., dated February 1, 2013 and amended May 1, 2020, found that per the 2015 IBC, site Class "D" should be used in structural design for the property. No excavation or fill is proposed for this project, and no trees are proposed to be removed. Cedar River A portion of the project site is located within 200 feet of the Cedar River, which is located east of the project site. The closest area of work will be located approximately 142 feet from the Ordinary High Water Mark (OHWM) of the Cedar River. The existing shoreline nearest to the project site is partially vegetated, with several trees and bushes adjacent to the edge of the OHWM. The areas that are not vegetated consist of rocky soil. There is a bluff approximately 12 feet in height and approximately 25 feet in depth from the OHWM to Perimeter Road, which is located adjacent to the river. The area between the project site and the OHWM consists predominantly of pavement. Conclusion The proposed demolition of the hangars will not have any significant environmental impacts. As the scope of work is limited to the demolition of existing structures, the risk of erosion and other environmental damage will be minimal. All construction activities will be conducted on site , and construction activities will begin and end in the winter of 2021/2022.