1-02.4(2)_Geotechnical_Report_FINAL_(PW#2025-017).pdf

This is a Geotechnical Report prepared for the City of Seattle's 45th Ave SW Culvert Replacement and Habitat Restoration project in southwest Seattle, where Fauntleroy Creek crosses 45th Ave SW between SW Director St and SW Wildwood Pl. The report provides subsurface investigation findings and geotechnical analysis necessary to support the design and construction of the culvert replacement project, which includes civil demolition with in-stream bypass, tree protection, site work, stream work, grading, utilities, paving, landscaping, structural work involving soldier pile shoring and precast concrete components, and electrical systems. The Engineer's Estimate for the overall project is $30,250,000.

The geotechnical report presents subsurface conditions, soil classifications, groundwater information, and engineering recommendations relevant to the project site. This investigation data is essential for contractors and engineers to understand foundation conditions, slope stability, dewatering requirements, and construction sequencing for the culvert installation and associated civil works. The report supports the bidding process by providing baseline geotechnical information that informs cost estimates, construction methodology, and risk assessment for potential bidders on this substantial public works project.