Interlocal Agreement Between the Cities of Burien, Des Moines, Normandy Park and Sea-Tac for Environmental Review of the Sea-Tac Airport Sustainable Airport Master Plan

Four cities near Sea-Tac Airport — Burien, Des Moines, Normandy Park, and SeaTac — entered into a formal interlocal agreement in 2018 to coordinate their review of the Port of Seattle's Sustainable Airport Master Plan (SAMP), a 20-year airport growth proposal with potential significant noise and environmental impacts on surrounding communities. The agreement establishes a shared process for hiring consultants, pooling funding, and submitting unified comment letters during the NEPA and SEPA environmental review processes. It covers the period from March 2018 through December 2020 and is governed by Washington State's Interlocal Cooperation Act (RCW 39.34).

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Interlocal Agreement No. 18-A039, executed pursuant to RCW 39.34 (Interlocal Cooperation Act), between the Cities of Burien, Des Moines, Normandy Park, and SeaTac for coordinated environmental review of the Port of Seattle’s Sustainable Airport Master Plan (SAMP). Agreement covers joint SEPA and NEPA review and commenting, consultant selection and funding, joint roles and responsibilities, and a single coordinated comment letter process. Approved by SeaTac City Council on 2/13/2018 (AB 4829); term 3/6/2018–12/31/2020; record retention until 2031. Addresses Sea-Tac Airport 20-year growth planning, Environmental Impact Statement process, and potential negative impacts on surrounding cities.

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