June 12, 2001August 2, 2026

EXH AR017654: Draft Meeting Notes — Low Flow Analysis, Sea-Tac Airport Third Runway, 401 Permit Decision-Making

Notes

Draft meeting notes from June 12, 2001 status meeting on Low Stream Flow related tasks for Sea-Tac International Airport Third Runway 401 Permit Decision-Making process. Attendees included Ann Kenny and John Drabeck (Dept. of Ecology), Kelly Whiting (King County), Keith Smith (Port of Seattle), Paul Fendt (Parametrix), and Charles Ellingson (Pacific Groundwater Group). Topics covered: HSPF and embankment seepage modeling, Hydrus modeling (10 and 20-foot thicknesses), Effective Recharge (ER) methodology, Recharge 1 vs. Recharge 2 approaches, SMP deliverable D-11 (Low Stream Flow Non-Hydrologic Effects), pre- and post-project hydrographs for 1991–1994 dry year period, stormwater retention vault sizing for mitigation, and the Low Stream Flow Analysis / Flow Impact Offset Facility Report. Prepared by Kate Snider, Floyd & Snider Inc. AR017654–AR017656.

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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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