Heavy Civil GC/CM Services for MDCSO Wet Weather Treatment Station

The contract pertains to the development of the Wet Weather Treatment Station (WWTS), a significant infrastructure project designed to address combined sewer overflows (CSOs) at the mouth of the Duwamish River in Washington. The project involves constructing a large-scale treatment facility with a capacity of approximately 240 million gallons per day, including an underground 4 million-gallon equalization basin, influent piping, screening, solids handling, and advanced disinfection systems utilizing ultraviolet light. Key components also include sedimentation technology, odor control, site surface improvements, and the demolition of existing structures and foundations to facilitate new construction. The scope emphasizes environmental management, soil disposal, ground improvements, and soil containment measures, ensuring compliance with environmental standards and project safety. The procurement process is managed by King County, which issued a Request for Proposals (RFP) seeking qualified Heavy Civil General Contractor/Construction Manager (GC/CM) firms through a competitive bidding process. The contract, with an estimated value between 100 million and 300 million dollars, is structured to include preconstruction and construction phases, with a total project duration of approximately 124 months. The contract documents include draft agreements for both preconstruction services and construction, detailing scope, cost estimates, project schedules, insurance, and subcontracting requirements. The project emphasizes collaborative delivery, adherence to Washington State RCW regulations, and aims to ensure environmental protection, operational efficiency, and long-term resilience of the wastewater infrastructure. The primary contact for the project is Melissa Jordan, and the project’s detailed documentation underscores its complexity, scale, and strategic importance for regional water management.