Project Location
Everett,
WA
Client
City of Everett
Market Sector
Project Type
- General Utilities & Infrastructure
Project Disciplines
Project Highlights
- Evaluated subsurface conditions through geotechnical borings reaching depths of up to 71 feet.
- Developed settlement and seepage recommendations for levees constructed over soft, compressible soils.
- Prepared geotechnical construction plans and bidding documents for two levee improvements.
Project Description
The 12th Street Levee and Operational Dikes project supported a major habitat restoration effort on Smith Island adjacent to the City’s wastewater treatment plant. The project was designed to reconnect tidal waters with existing and restored wetland areas, helping reestablish historic tidal habitat for fish and wildlife.
Our geotechnical team evaluated subsurface conditions to support the widening of an existing levee along the wastewater treatment ponds and constructing a new standalone levee. Geotechnical borings extending to depths of up to 71 feet identified thick deposits of soft, compressible soils that presented significant settlement and seepage considerations.
The team performed laboratory testing and developed recommendations for settlement mitigation, seepage control, and levee construction. Services also included preparation of geotechnical construction plans and bidding documents, providing the City with the technical foundation needed to safely construct the levee improvements while supporting the project’s broader environmental restoration goals.
Work performed by Nelson Geotechnical Associates, Inc., now part of MacKay.