Notes
Northwest Hydraulic Consultants (nhc) letter dated September 21, 2000 to Gordon White, Program Director, Washington State Department of Ecology, Shorelands and Environmental Assistance Program, on behalf of the Airport Communities Coalition (ACC). First set of preliminary comments on the August 2000 Stormwater Management Plan (SMP) for the SeaTac Airport third runway development (Seattle-Tacoma International Airport Master Plan Update Improvements). Documents King County’s finding that proposed stormwater mitigation facilities in multiple basins (SDN1, SDN-6, NEPL, SDN2X/SDN4X, SDN3X, SDN3A, SDW1A, SDW2, SDS-7, SDS3A, SDS-3, SASA, SDS 2,5,6) failed to meet Level 2 flow control performance standards or had unverified performance under calibrated HSPF and Miller Creek HSPF models. Raises issues with 401 Certification application, KCRTS regional parameters, KCSWDM 1979 baseline landuse requirements, groundwater recharge claims, Des Moines Creek HSPF INP model storage discrepancies, and points of compliance at South 200th Street. Exhibit AR018972, PCHB Third Runway administrative record.