August 22, 1996August 2, 2026

Exhibit AR026790: NPDES Modification to Waste Discharge Permit No. WA-002465-1, Port Of Seattle Sea-Tac International Airport — Response to Comments

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Response to comments document (AR 026790) prepared by Lisa Zinner, P.E. for the Washington Department of Ecology regarding NPDES Permit No. WA-002465-1 modification for Port Of Seattle, Sea-Tac Airport. Covers public hearing held June 12, 1996 in Burien, WA at Burien Public Library. Addresses self-monitoring under Clean Water Act Section 308, stormwater discharges to Miller Creek and Des Moines Creek, Special Condition S16 requiring hydrology impact assessment, and enforcement procedures including Notice of Violation and Administrative Orders. Testifiers include Tom Hubbard, Robert Pearce, and Minnie Brasher. Permit regulates treated industrial wastewater and stormwater discharge; Sea-Tac Airport comprises five percent of Miller Creek drainage basin; King County Surface Water Management Division referenced.

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As the source for federal transportation grants, the Puget Sound Regional Council was charged with developing a system to meet the growing need for commercial aviation. When the search for a second airport failed, they authorized the Port of Seattle to build the Third Runway, with a mandate to develop a noise abatement and mitigation program. In their effort to stop the Third Runway, the ACC argued over every detail of the Port's efforts--including property buyouts and sound insulation. The dispute was meant to be settled by a three member Expert Arbitration Panel. This is their final report. It finds 2-1, that the Port's program was insufficient in several respects. Despite that, funding for the Third Runway was approved by the PSRC, and the 'Port Package' program, proceeded largely unchanged. Expert Arbitration Panel's final decision finding that the Port of Seattle had not shown sufficient reduction in real on-the-ground noise impacts to satisfy noise reduction conditions required for approval of a third runway at Sea-Tac International Airport. The majority decision concluded the Port's noise abatement programs were insufficient despite being impressive in scope.

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