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

Location: Washington
Posted: Aug 25, 2025
Due: Oct 21, 2025
Agency: King County
Type of Government: State & Local
Category:
  • C - Architect and Engineering Services - Construction
Solicitation No: KC001480
Publication URL: To access bid details, please log in.
Abstract: Alternative Procurements KC001480
Title Heavy Civil GC/CM Services for MDCSO Wet Weather Treatment Station
Solicitation Type Alternative Procurements
Status Active
Buyer Melissa Jordan
Email mejordan@kingcounty.gov
Synopsis The WWTS is a new treatment facility to treat combined sewer overflows (CSOs) prior to discharge through a new outfall into the east waterway at the mouth of the Duwamish River. The project will construct an equalization basin(s), screening, pumps, ballasted sedimentation technology for solids removal, chlorine disinfection system utilizing ultraviolet light (UV) disinfection, solids storage, and instrumentation and controls. The scope includes the demolition of existing structures and foundations, construction of a below-grade 4 million-gallon (MG) equalization basin, shoring and excavation work, and soil management (including disposal of contaminated soils, ground improvements, and tremie slabs). The scope also includes influent piping, screening and pumping, construction of a vendor supplied ballasted sedimentation UV disinfection treatment system, solids handling, odor control systems, and site surface improvements.
Attachments
KC001480-rfp-documents.zip (7.14 MB)
Open Date 8/25/25 03:16:01 PM
Close Date 10/21/25 01:30:59 PM
Posting Date 8/25/25
Additional Information
KC Solicitation NAICS Code(s) 237990;237110;541330
Small Business Requirements Apply? Yes
Department NATURAL RESOURCES AND PARKS
Division WASTEWATER TREATMENT
O K
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