for Streets Project
In August 2016, the City of Seattle completed the “Adjacent Streets & Stormwater” phase of Terminal 117 Early Action Area within the Lower Duwamish Waterway Superfund site. As part of the cleanup and construction within the South Park neighborhood, the City completed the following activities in their final phase of work:
Removed 27,800 tons of PCB-contaminated soils
Planted 138 trees supplemented with shrubs and other plantings
Installed 9 rain gardens and 4 Filterra® tree boxes to improve stormwater quality
Placed 11 new art installations within the neighborhood
Installed 2,200 feet of new sidewalks
Installed 1,500 feet of new storm drainage pipes under the streets
The City of Seattle, its construction contractor, and adjacent property owners will share responsibility for overall maintenance once the many new trees, shrubs, and plants in the neighborhood are established. This is the same practice used throughout the City of Seattle. Guidelines for maintenance are provided in the attached document,
Tree and Landscaping Maintenance Guide, September 2016
Excavation is complete and a total of 27,800 tons of PCB-contaminated soil has been removed from the streets in the South Park neighborhood adjacent to Terminal 117.
Construction Photos. Click to start Slideshow
Click here to view archived construction photos.
New educational signs were installed along the non-motorized pathway and on 17th Ave. The signs explain how the rain gardens and Filterra tree boxes function, and how they improve water quality in the South Park neighborhood.
(Click on photo to enlarge.)
For More Information
Questions or concerns about cleanup construction?
Call the T-117 Information Line:
1-877-999-T117 (8117) or email
to submit a comment.
Tree and Landscaping Maintenance Guide, September 2016 (click below).
Community Resource Guide now Available (click below).
Yards Project Archive
Progress to-date: an interactive map