Notes
Letter dated July 18, 2001 from Peter Willing, Ph.D., Water Resources Consulting L.L.C., to Ann Kenny (Washington State Department of Ecology) and Muffy Walker and Gail Terzi (U.S. Army Corps of Engineers Regulatory Branch), regarding USACE Reference 1996-4-02325, Section 404 permit application for Sea-Tac Airport third runway. Addresses BMP performance concerns: biofiltration swales (bioswales) show low or negative fecal coliform removal efficiency per EPA 1999, Claytor/Schueler 1996, and Adolfson 1999 studies. Raises serious concerns about Port Of Seattle’s stored stormwater flow augmentation proposal — 8.9 acre-feet in Miller Creek Basin and 7.1 acre-feet in Des Moines Creek basin — including anaerobic conditions, anoxic sediment-laden discharge to Class AA streams, bound inorganic compounds returning to solution, and absence of treatment proposals. References HNTB 2001 maintenance memorandum showing no consideration of flow augmentation. Argues Port Of Seattle has not met reasonable assurance standard for water quality compliance. Cites Miller Creek, Des Moines Creek, SDS4 vault, Strecker/Quigley/Urbonas BMP effectiveness criteria.