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Environmental review
This page lists environmental documents prepared by the King County Wastewater Treatment Division that are currently available for public review and comment.
Documents currently available for public comment
Title of proposal: Eastside Interceptor Section 8 rehabilitation Project
Description of proposal: The King County Wastewater Treatment Division proposes to repair Eastside Interceptor Section 8 (ESI 8), a 1-mile underground pipeline going from the I-90 and I-405 interchange in Bellevue to the intersection of Coal Creek Parkway Southeast and I-405. The project objective is to maintain reliable sewage conveyance and extend the useful life of the existing sewer by rehabilitating conveyance system pipelines and structures suffering from severe hydrogen sulfide related corrosion while minimizing capacity impacts. A temporary above-ground diversion pipe will be placed along the East Rail Corridor during construction. Project construction is scheduled to begin in 2026 and end in 2027.
Location of proposal, including street address, if any: The approximately 2-mile-long project area is located entirely within the City of Bellevue, King County Parks, King County WTD, and Washington State Department of Transportation properties.
Issue date: April 4, 2025
Comment deadline: April 21, 2025
Submit comments via email to: WTDSEPA@kingcounty.gov; or via postal mail to:
Supervisor, Environmental Planning, King County Wastewater Treatment Division
201 S Jackson Street, MS KSC-NR-6200, Seattle, WA 98104-3855
For questions or information on how to submit comments electronically, contact Bailey Pfeiffer, Environmental Planner, at 206-263-0611 or bpfeiffer@kingcounty.gov.
Download documents: Determination of Nonsignificance (DNS) and Environmental Checklist.
Frequently asked questions
The listed documents are mainly threshold determinations and checklists prepared under the Washington State Environmental Policy Act (SEPA statute, RCW 43.21C; SEPA Rules, WAC 197-11). Other environmental documents prepared by the Wastewater Treatment Division, such as documents prepared under the National Environmental Policy Act (NEPA), may also be listed.
Local, state and federal regulations mandate the ways in which agencies must notify the public that environmental documents are available for public comment. These may include mailings, signs and/or newspaper notices. The Wastewater Treatment Division typically makes the documents available in local libraries and upon request. This web page is another way in which the division provides notice and copies of these documents.
You may view and download an electronic copy of each listed document by clicking on the associated link. Information on how to provide comments on each document listed below is included in the document.
Yes. Please refer to the SEPA appeal process.