In June 2004, the Washington State Department of Ecology granted a Water Quality Certification to the Port of Seattle for the construction of a third parallel runway at Seattle-Tacoma International Airport (Sea-Tac), along with related projects such as taxiways, navigational aids, and runway safety areas. The certification, designated Order #1996-4-02325 (Amended-2), was updated to reflect a Washington Supreme Court ruling and confirms that the project complies with applicable provisions of the Clean Water Act and state environmental laws. The approval is subject to conditions including compliance with hydraulic project approvals and stormwater permits issued by state agencies.Open full document
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The Washington State Department of Ecology certifies that the Port of Seattle’s proposed construction of a Third Runway and related projects at Seattle-Tacoma International Airport complies with applicable provisions of the Clean Water Act and state law. The letter rescinds Order Number 1996-4-02325 (Amended-1) and replaces it with Order Number 1996-4-02325 (Amended-2) to incorporate changes required by the Washington Supreme Court’s decision. The certification is subject to conditions in the enclosed Order and related permits including HPA, NPDES, and General Stormwater permits.