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EXH AR024343: Letter to Ecology — Stormwater Detention, Treatment, Copper, First Flush, Wetland Delineation, Water Rights

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Sea-Tac Airport
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In a September 28, 1998 letter from the Port of Seattle to the Washington Department of Ecology, the Port provides a status update on stormwater management efforts at Seattle-Tacoma International Airport, covering detention, treatment, copper loading, and first flush analysis. The letter outlines proposed delivery dates for required reports and explains the complexity of treating stormwater runoff, including challenges related to mandatory FAA-regulated de-icing and anti-icing chemicals used on runways. It also addresses the status of ongoing wetland delineations and water rights reviews connected to the airport's planned third runway construction.

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September 28, 1998 letter from Port Of Seattle (Seattle-Tacoma International Airport) to Tom Luster, Department of Ecology, responding to Ecology’s September 25, 1998 letter. Covers stormwater detention level 2 flow controls and retrofitting analysis, stormwater treatment BMPs (best management practices), copper source controls for Miller Creek and Des Moines Creek, first flush analysis, source control BMPs (Stormwater Pollution Prevention Plan), wetland delineation status for third runway construction, and water rights status including Tyee Golf Course wells and Des Moines Creek augmentation. References Lisa Zinner (NWRO), Appendix F reasonable potential analysis, FAA anti-icing and deicing chemical requirements, and proposed delivery dates for stormwater quantity/quality reports by October 20, 1998. Exhibit AR024343 in PCHB third-runway-eis administrative record.

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