Project Information

Bid Title

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

Issuing Agency

King County

Location

Washington

Published Date

Sep 12, 2025

Closing Date

Oct 21, 2025

Government Level

State & Local

Status

Closed

Ref. #

KC001480

Original Source

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Bid Documents

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Project Description

	Abstract: Alternative Procurements KC001480,1
	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. Addendum Description Addendum 1 has been issued. Proposers must acknowledge all addenda before submitting a proposal. If a Proposer has already submitted a proposal, they must log into the E-Procurement Supplier Portal, acknowledge the addendum, and resubmit. Attachments KC001480-addendum-1.pdf (2.69 MB) KC001480-rfp-documents.zip (7.14 MB) Open Date 9/12/25 02:21:14 PM Close Date 10/21/25 01:30:59 PM Posting Date 9/12/25 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

Commodity Codes

• NAICS 237110Water and Sewer Line and Related Structures Construction
• NAICS 237990Other Heavy and Civil Engineering Construction

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