HomeMy WebLinkAboutPN_Project Narrative
Stoneway Retaining Wall Repair
City of Renton, Washington
This project consists of emergency, interim repairs to an approximately 130-foot section of
failed retaining wall along the south side of the Stoneway Property / Cedar River Park
(Parcel ID: 1723059026), immediately adjacent to the Cedar River in Renton, Washington.
The work is intended to stabilize the riverbank, restore structural integrity, and protect
adjacent infrastructure while a permanent solution is evaluated.
The site is a remediated property with documented elevated pH and arsenic in buried soils
and is subject to an environmental covenant with the Washington State Department of
Ecology. All work shall be performed in compliance with the covenant, applicable permits,
and regulatory requirements.
The scope of work includes:
• Mobilization, site setup, and establishment of staging and stockpile areas.
• Installation, maintenance, and removal of temporary erosion and sediment control
measures, including in-water silt screens or curtains.
• Removal of damaged retaining wall components, fencing, and debris from upland
and in-water areas as necessary to complete stabilization.
• Excavation and regrading of the riverbank, including temporary and final
reconstructed slopes.
• Installation of five-man boulders and Class 5 riprap to restore toe protection and
stabilize reconstructed slopes, without encroachment beyond the original wall
alignment.
• Stockpiling, handling, testing, reuse, or disposal of excavated soils as directed by
the City and on-site environmental oversight.
• Final site restoration, surface stabilization, and revegetation or hydroseeding of
disturbed upland areas following City acceptance.