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This page lists environmental documents prepared by the King County Wastewater Treatment Division that are currently available for public review.

You may view and download an electronic copy of each listed document by clicking on the associated link. 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.

Information on how to provide comments on each document listed below is included in the document. The document, including this information, may be viewed by clicking on the link provided for the document.

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 site is another way in which the division provides notice and copies of these documents.

Environmental documents currently available for review

Only documents currently available for public comment are listed. If the list is empty, no documents are currently available for comment.

Title of proposal:  South Plant Biogas and Heating Systems Improvements

Description of proposal:  The King County Wastewater Treatment Division (KCWTD) proposes to replace the existing biogas upgrading system (BUS) and heating systems at KCWTD's South Treatment Plant (STP) in Renton, WA. The project will improve the plant's ability to produce biomethane gas, which can be used as fuel, from the wastewater treatment process. The project will also improve the plant's heating systems to mot'e reliably meet process and space heating demands. The project includes construction of the Heat and Energy Recovery Building (HERB), a new thermal oxidizer, heating system improvements within the existing Digester Equipment Building, stormwater management facilities, and utility connections. Project construction is scheduled to begin in mid-2019, and the new biogas and heating system is scheduled to be operational by the end of 2021.

Issue date:  March 9, 2018

Comment deadline:  March 23, 2018

Download document and view instructions to comment: DNS and Environmental Checklist