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EXH AR020456: Draft Meeting Notes – Low Flow Analysis, STIA Third Runway 401 Permit, July 9, 2001

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Sea-Tac Airport
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These draft meeting notes from a July 9, 2001 technical meeting cover low flow analysis related to the 401 Permit decision-making process for Sea-Tac International Airport's Third Runway project. Attendees from the Department of Ecology, King County, Port of Seattle, and several consulting firms discussed methods for determining low stream flow impacts and mitigation requirements across affected watersheds. Key topics included biological effects on fish habitat, a proposed 0.1 cfs mitigation flow for the Des Moines Watershed, and the use of 2-year 7-day low flow rates to guide mitigation planning.

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Notes

Draft meeting notes from July 9, 2001 low flow analysis technical meeting for the Sea-Tac International Airport Third Runway 401 Permit decision-making process. Prepared by Kate Snider, Floyd & Snider Inc. Attendees included Ann Kenny and John Drabeck (Dept. of Ecology), Kelly Whiting (King County), Keith Smith (Port of Seattle), Paul Fendt and Don Weitkamp and Robert Farid (Parametrix), Rick Schaefer (EarthTech), Joe Brascher (Aquaterra), and Pony Ellingson (Pacific Groundwater Group). Topics covered: biological effects used in low flow impact determination using 2-year 7-day low flow rates; Des Moines watershed mitigation proposal (0.1 cfs mitigation flow, July 24–October 24 duration, 11 acre-feet vault size); Miller and Walker watershed status briefing; fish habitat carrying capacity; dissolved oxygen levels; mitigation temperature effects. AR 020456–020458.

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