Heavy Civil GC/CM Services for MDCSO Wet Weather Treatment Station
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King County |
| State: |
Washington |
| Type of Government: |
State & Local |
| NAICS Category: |
- 237110 - Water and Sewer Line and Related Structures Construction
- 237990 - Other Heavy and Civil Engineering Construction
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| Posted Date: |
Oct 15, 2025 |
| Due Date: |
Oct 28, 2025 |
| Solicitation No: |
KC001480 |
| Original Source: |
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| Contact information: |
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| Bid Documents: |
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Abstract: Alternative Procurements KC001480,4
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Title
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Heavy Civil GC/CM Services for MDCSO Wet Weather Treatment Station
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Solicitation Type
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Alternative Procurements
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Status
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Amended
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Buyer
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Melissa Jordan
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Email
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mejordan@kingcounty.gov
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Synopsis
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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.
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Addendum Description
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Addendum 4 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.
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Attachments
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KC001480-rfp-addendum-4.pdf
(790.38 KB)
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KC001480-rfp-addendum-2.pdf
(418 KB)
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KC001480-rfp-documents.zip
(7.14 MB)
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KC001480-addendum-1.pdf
(2.69 MB)
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KC001480-rfp-addendum-3.pdf
(505.68 KB)
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Open Date
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10/9/25 05:18:49 PM
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Close Date
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10/28/25 01:30:59 PM
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Posting Date
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10/10/25
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KC Solicitation NAICS Code(s)
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237990;237110;541330
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Small Business Requirements Apply?
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Yes
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Department
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NATURAL RESOURCES AND PARKS
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Division
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WASTEWATER TREATMENT
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