Mitigated Determination of Nonsignificance: Des Moines Creek Business Park West (LUA2022-0044)

The City of Des Moines issued a Mitigated Determination of Nonsignificance (MDNS) for a proposed 402,380-square-foot industrial building near Seattle-Tacoma International Airport, finding no significant environmental impact provided certain conditions are met. Key mitigation requirements include wetland and stream protections, long-term environmental monitoring, and compliance with FAA Advisory Circular 150/5200-33C standards to ensure the project's stormwater detention pond does not attract hazardous wildlife that could pose risks to aircraft operations. The decision, issued July 8, 2024, was open for public comment through July 23, 2024, with an appeal deadline of August 2, 2024.

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City of Des Moines SEPA Mitigated Determination of Nonsignificance (MDNS) for File No. LUA2022-0044, issued July 8, 2024, by Responsible Official Laura Techico, AICP. Proposal by Panattoni Development Corporation for construction of a 402,380 square-foot industrial building on 21 acres of a 30-acre site at King County parcels 0922049042 and 0922049303, north and west of the 20th Ave. S. and S. 216th St. intersection. Project proposes to fill 11,938 square feet of wetlands, reroute a Type Ns stream, construct a new trail connecting existing trail systems, and provide associated mitigation. Exhibit 1 mitigation requirements include compliance with Terra Associates Geotechnical Report (revised February 24, 2023), Soundview Consultants Conceptual Mitigation Plan (revised March 2024), Arborist Report and Tree Retention Plan (March 7, 2024), 10-year wetland creation and stream relocation monitoring, performance bond per DMMC 16.10.330(1), environmentally critical areas easement per DMMC 16.10.320 and 17.35.190(2), FAA Advisory Circular 150/5200-33C stormwater detention pond standards, and Interlocal Agreement with Port Of Seattle for Des Moines Creek West trail. Comment deadline July 23, 2024; appeal deadline August 2, 2024.

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