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HomeMy WebLinkAboutPN_Project_Narrative_250508_v1 Project Narrative Rolling Hills Creek Pipe Rehabilitation Project SWP-27-4297 PROJECT OBJECTIVE Repair 340 LF of 42” CMP and 66 LF of concrete pipe via CIPP Lining. PROJECT BACKGROUND & DESCRIPTION The City of Renton Surface Water Utility has identified three segments of pipe that have been damaged or are starting to fail due to age. The Surface Water Utility has setup a CCTV review program that videos stormwater pipes. CCTV of assets 128514, 118951, and 128467 have been reviewed for pipe deterioration and cracking. Each of these damaged sections convey water from Rolling Hills Creek. The Rolling Hills Creek Pipe Rehabilitation Project is a maintenance project to ensure that further deterioration is stopped by inserting a CIPP liner into each pipe. This liner extends the life of the existing pipe by sealing the cracks and other damages of the pipe. FACILITY CONFIGURATION CIPP Lining of 340 LF of 42” CMP Pipe and 66 LF of 24” Concrete Pipe adjacent Talbot Rd S. Easements: No easement is required due to the work being entirely in the City of Renton right-of-way. Surveying and Geotechnical Investigation: No survey was conducted. Information for design drawings were based on City of Renton GIS data. No geotechnical report has been generated and is not required because the project is lining existing 24” and 42” pipes and will not be impacting the soil. Design: The City of Renton Surface Water Utility has completed the design of the project internally. Design elements included construction plans, specifications, and engineer’s cost estimate. Environmental Review Permits: This project requires an HPA from WA Department of Fish and Wildlife because the pipe being repaired conveys Rolling Hills Creek. A Critical Areas Exemption permit is being requested. Lastly, this project is categorically exempt from SEPA because this is a maintenance project per WAC 197-11-800 (3). Construction: There are three segments (manhole to manhole) of pipe lining. A total of 66 LF of 24” concrete pipe and 340 LF of 42” CMP to be lined. Each segment should take approximately 1 day to complete for a total of 3 days of lining work. The work will consist of setting up at the upstream and downstream structure and installing the new liner. Challenges will include access to the structures and traffic/pedestrian control. PRELIMINARY COST ESTIMATE Engineer’s Cost Estimate: $342,500 FUNDING SOURCE Page 2 of 2 https://cityofrentonwa.sharepoint.com/sites/DEPT_PW_Admin/Shared Documents/Surface Water Engineering/SW CIP Projects/27-4297 Rolling Hills Creek and Rolling Hills Ave SE/080 Permitting/City/CRIT AREAS/RH Creek/27-4232 Project-Proposal-Panther Creek.doc The Surface Water Utility has allocated funding for the design and construction of this project through the Small Scale Stormwater Projects budget (427.475015). PROJECT SCHEDULE Permitting Complete by June 27, 2025 Final Design Complete by June 2, 2025 Construction July 1, 2025 - August 30, 2025 STAKEHOLDER ENGAGEMENT Community: The Rolling Hills Creek Lining project will have limited impact to nearby residents/community members due to project location and time required to complete project. Lining the pipes should only take a couple days. When lining work is to be performed the City of Renton project manager and inspector will work with the contractor to notify all residents and community members impacted. They will also ensure the adequate access to properties are maintained. Other Agencies: City of Renton - Maintenance, City of Renton – CED, WA Department of Fish and Wildlife Private Utilities: There are no anticipated impact private utilities. No excavation or underground work will be conducted. Project is lining an already existing 42” and 24” pipe. Utility locates will be responsibility of contractor to ensure that their method of accessing the project site and performing lining of pipe will not impact other utilities. STAFFING Project Management: The project manager is Jared McDonald, Surface Water Utility. Mapping: Based on City GIS. Geotechnical Investigations: Not required. Design Engineer: The design engineer is Jared McDonald from the Surface Water Utility.