Seattle City Light
Civic & Public
We were the prime consultant for a six-year on-call contract that included engineering investigation and design services for underground and overhead utilities. Our task orders included:
230 kV Transmission Lines Uprating, Skagit Generating Facilities to Bothell Substation: Working with high-voltage experts, our team performed a comprehensive analysis of the transmission lines with the goal of identifying areas that were limiting the ampacity rating, assessing the work required to remove these as limiting elements, and providing a cost estimate for these areas of work.
Magnolia Bridge Lighting Retrofit: We provided field inspections to assess the condition of 50 light poles, luminaires, the electrical power system, and the structural integrity of the light poles, bases, and anchorage to the Magnolia Bridge structure. We also coordinated with the structural engineer and material testing specialist to verify the structural integrity of the light poles.
Delridge to South Station Fiber Path Project: The SCL 900 mHZ communication system needed to be decommissioned to allow a different agency to access this wireless spectrum. We worked with our transmission line specialist subconsultant to provide fiber optic lines for monitoring and control between South Station Substation and Delridge Substation. The fiber optic line was routed on existing SCL transmission towers and poles. Coordination was required for railroad crossings, railroad easements, marine traffic on the Duamish river, and private property crossings.
Pier 91 Cruise Ship Terminal Study: Ships moored at Pier 91 experienced problems connecting to shore power and had to remain on ship power while in port, which is in violation of several local ordinances for clean air. Our assessments determined that an issue with the voltage regulation at the transformers leading to the ships was causing the problem. We worked with the cruise lines at the terminal to identify the need for a new transformer that could provide the required voltage regulation to serve the cruise ships.