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HomeMy WebLinkAbout5-PN_BWProject_Narrative_230316_v1 Public Works Department Memorandum DATE: March 2023 TO: Jill Deng, Senior Planner FROM: Troy Solly, Surface Water Utility Engineer SUBJECT: Burnett Ave S and Williams Ave S Storm System Improvement Project – Environmental Review Project Narrative Project Narrative The purpose of the Burnett Ave S and Williams Ave S Storm System Improvement Project is to improve water quality in the Cedar River watershed by installing water quality treatment facilities. The water quality portion of the work is being funded through a Water Quality Combined Financial Assistance Agreement between Ecology and the City (Agreement No. WQC-2020-Renton-00214). The project also includes replacing existing undersized stormwater conveyance pipes within the project area with new, larger pipes to minimize flooding, and will include removal and in-kind restoration of asphalt surfacing, concrete sidewalks, grass, and other surface features as necessary to install the stormwater improvements. A Civil Construction Permit, and Construction General Permit will be filed for the project. The project is located near downtown Renton, south of the Cedar River and west of Interstate 405 (I-405). The project area is approximately 136,000 sf (3.17 acres) located entirely within City of Renton Right-of-Way on Burnett Ave S and Williams Ave S between 2nd Street S and the Cedar River; and S Tobi n Street between Burnett Ave S and Williams Ave S. Burnett Ave S and Williams Ave S are located within the City’s Center Downtown area and are lined by a variety of commercial businesses and other mixed-use properties and contain several other utilities, both public and private. The area is zoned CD – Center Downtown. Construction cost is estimated to be approximately 3.6 million dollars and will require the excavation and replacement of approximately 2,900 cubic yards of material. The road surface will be restored to its current state following construction. There will be no change to land use, zoning, or access as a result of the project. Storm drain improvements are planned to address undersized pipes in the existing system by upsizing existing pipes to meet the current City storm drainage design Page 2 of 2 March 16, 2023 guidelines and to address identified deficiencies in pipe condition and material. The existing pipe in Burnett Ave S, Williams Ave S, and S Tobin St within the project area will be replaced with new pipe. Two modular wetland facilities, one in S Tobin St and one in Williams Ave S, will also be installed to provide water quality. The new pipe in S Tobin St will be upsized to 36” and will function as a stormwater control structures. Sewer improvements are planned within a portion of Burnett Ave S to improve clearance from the proposed storm system and replace pipes that have reached their useful lifespan . Water improvements are planned to replace existing infrastructure and services that will be impacted by the proposed storm system improvements and to facilitate construction of the proposed stormwater improvements. A portion of the project is within 200-ft of the Cedar River, existing storm drain structures and piping within the project area on Williams Ave S and S Tillicum St will be replaced and one MWS-Linear Modular Wetland will be installed. This work will be confined to the existing paved roadway, which is not within the FEMA 100-year floodway and will not result in any obstructed views. The Cedar River is contained in an engineered channel in this location with pedestrian walkways along both sides of the river. The replacement of the storm drain qualifies for a Shoreline Exemption per City of Renton Code 4-9-190.C. as detailed below: 4-9-190.C. EXEMPTIONS FROM PERMIT SYSTEM: The following shall not be considered substantial developments for the purpose of this Master Program and are exempt from obtaining a Shoreline Substantial Development Permit (SSDP). An exemption from an SSDP is not an exemption from compliance with the Act or the Shoreline Master Program, or from any other regulatory requirements. 3. Maintenance and Repair: Normal maintenance or repair of existing structures or developments, including damage by accident, fire or elements. a. “Normal maintenance” includes those usual acts to prevent a decline, lapse, or cessation from a lawfully established condition. b. “Normal repair” means to restore a development to a state comparable to its original condition, including but not limited to its size, shape, configuration, location and external appearance, within a reasonable period after decay or partial destruction, except where repair causes substantial adverse effects to the shoreline resource or environment. c. 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.