Notes
Northwest Hydraulic Consultants (NHC), retained by the Airport Communities Coalition (ACC), submits technical review comments to the U.S. Army Corps of Engineers (Jonathan Freedman) and Washington State Department of Ecology (Ann Kenny) on the December 2000 Comprehensive Stormwater Management Plan (SMP), Natural Resource Mitigation Plan (NRMP), and Wetland Functional Assessment (WFA) for the Seattle-Tacoma International Airport Third Runway and Master Plan Update Improvements (Corps Reference No. 1996-4-02325). Authored by Rozeboom and Dr. Leytham of NHC, the letter identifies deficiencies including inconsistent stormwater detention standards between the SMP Section 2.1.4 updated requirements and NPDES Permit No. WA-002465-1 Special Condition S14, lack of detailed facility designs, absence of independent KCSWDM drainage review, no financial guarantees under KCSWDM Core Requirement 7, and risks of adverse impacts to Miller Creek and Des Moines Creek. References King County Surface Water Design Manual (KCSWDM), HSPF simulation model, Section 401 Certification, Section 404 Permit, Parametrix Inc., and Snoqualmie Ridge project.