EXH AR026129: King County DNR Letter to Ecology — Comprehensive Stormwater Mgmt Plan STIA Master Plan Update

In September 2000, King County's Department of Natural Resources provided a technical review of the Port of Seattle's Comprehensive Stormwater Management Plan (SMP) for proposed Master Plan Update improvements at Seattle-Tacoma International Airport. The review found no fatal flaws in the plan's approach to meeting King County's stormwater standards, but identified inconsistencies in flow control calculations and water quality measures that needed to be resolved before final permitting. King County also emphasized the importance of rigorous erosion and sediment control during construction and recommended that Ecology and the Port establish a joint compliance team to oversee implementation of the complex, multi-year project.

Notes

Letter dated September 15, 2000 (corrected version) from Pam Bissonnette, King County Department of Natural Resources, to Tom Luster, Washington State Department of Ecology Shoreline and Environmental Assistance Program, reviewing the Port of Seattle’s Comprehensive Stormwater Management Plan (SMP) for Master Plan Update Improvements at SeaTac International Airport. The letter evaluates compliance with the 1998 King County Surface Water Design Manual, addressing water quality treatment, flow control, erosion and sediment control, and Best Management Practices (BMPs). Reviewers found no fatal flaws but identified inconsistencies between the SMP’s analytical appendices and proposed mitigation measures, generally erring toward under-mitigation. Recommends Ecology and Port of Seattle establish a joint compliance team. AR 026129–AR 026131. Filed in PCHB third-runway-eis administrative record.

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