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EXH AR023762: Email Turning Basin #3 Duwamish/Hamm Creek Disposal Site Runway Coordination

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Sea-Tac Airport
Third Runway
PCHB
Box 10

A April 14, 1999 email from Mike O'Neil of Metro King County discusses plans to use a Port of Seattle runway at Sea-Tac Airport as a disposal site for dredged material from Turning Basin #3 on the Duwamish/Hamm Creek project. The Port's contact, John Rothnie, found the material geotechnically and environmentally acceptable, but noted that sending more than 6 trucks per hour could trigger a special permit requirement from the City of SeaTac. Hauling was estimated to begin in June 1999 and conclude in August, with contingency plans for dewatering especially wet material at an alternative commercial site.

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Email dated April 14, 1999 from Mike ONeil (Metro King County) to Brett Amrine and Wanda Gentry, cc Karen Goto, Paul Cooke, Patrick Cagney (NWS), regarding disposal of dredged material from Turning Basin #3 on the Duwamish/Hamm Creek at a Port of Seattle runway site. Contact John Rothnie (Port, 997-4107) confirmed material looks geotechnically and environmentally acceptable. Discusses rate of delivery (6 trucks/hour limit or City of SeaTac special permit required), hauling timeline June–August, dewatering of wet material, commercial disposal alternative, and type of agreement needed with Port of Seattle (memorandum of understanding). AR023762, Third Runway EIS administrative record, PCHB.

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