Notes
Exhibit 272 (AR 019509–019511). Draft meeting notes prepared by Kate Snider of Floyd & Snider Inc. from a July 9, 2001 low flow analysis meeting concerning the 401 Permit decision-making process for Sea-Tac Airport Third Runway. Attendees included Ann Kenny and John Drabeck (Dept. of Ecology), Kelly Whiting (King County), Keith Smith (Port Of Seattle), and consultants from Parametrix, EarthTech, Aquaterra, and Pacific Groundwater Group. Topics covered: biological effects used in low flow impact determination using 2-year 7-day low flow methodology; Des Moines watershed mitigation proposal (0.1 cfs mitigation flow, July 24–October 24 duration, 11 acre-feet reserve vault); Miller Creek and Walker Creek watershed status including SLICE model integration with HSPF and non-hydrologic effects in property acquisition area (water rights removal, septic system inputs); fish habitat carrying capacity, dissolved oxygen, and stream temperature effects. Key figures: pre-project 2-year 7-day low flow 0.35 cfs, post-project 0.25 cfs for Des Moines watershed.