November 26, 2001August 2, 2026

EXH AR006092: Third Declaration of Paul S. Fendt — ACC v. Ecology and Port Of Seattle, PCHB No. 01-160

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Third Declaration of Paul S. Fendt (Parametrix, Inc.) filed in PCHB No. 01-160, Airport Communities Coalition v. Department of Ecology and Port Of Seattle. Fendt, licensed PE with 18+ years stormwater engineering experience, addresses calculation of summer low streamflow impacts on Miller Creek, Walker Creek, and Des Moines Creek for the Port Of Seattle Master Plan Update (MPU). Details HSPF (Hydrologic Simulation Program-Fortran) modeling methodology, 2-year 7-day low flow determination using 47 years of precipitation record (1949-1995), Comprehensive Stormwater Management Plan (SMP), and Low Streamflow Analysis – Flow Impact Offset Facility Proposal. Discusses August-October dry season low flows, King County Surface Water Design Manual, Department of Ecology Stormwater Manuals, and NPDES stormwater permits.

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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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