The City of Des Moines and neighboring cities have entered into an Interlocal Agreement (ILA) to coordinate their review of and response to the SeaTac Airport Master Plan (SAMP) environmental review process, covering both federal (NEPA) and state (SEPA) requirements. Originally signed in 2018 and updated in 2024, the agreement establishes how participating cities share costs, manage contracts, and jointly hire environmental and legal consultants—including attorneys who can support a legal challenge to the SAMP's environmental conclusions. The latest version, managed by the City of SeaTac and expected to run through December 31, 2028, excludes Normandy Park but otherwise continues the multi-city partnership focused on protecting community interests during the airport planning process.Open full document
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This presentation outlines the history and updates to an Interlocal Agreement (ILA) among multiple cities for coordinated review of the Sustainable Airport Master Plan (SAMP), including SEPA and NEPA environmental processes. The original ILA was signed in 2018 with amendments in 2020, and a new ILA in 2024 extends through anticipated completion of the SAMP by December 31, 2028. Key changes in the new ILA include the addition of legal services, transfer of contract and fiscal management to the City of SeaTac, and Normandy Park’s non-participation.
