TagWater Quality(478)

Letter dated January 21, 2001 from Tom Luster, Washington State Department of Ecology, to Senator Julia Patterson of the Washington State Senate, responding to her request for information on Ecology’s Section 401 Clean Water Act review of the proposed SeaTac Airport expansion. Luster provides a brief assessment of key issues including antidegradation requirements, beneficial uses,

This document outlines the Washington State Department of Ecology's Section 401 Water Quality Certification review process for the proposed Sea-Tac Airport expansion, detailing the legal standards and unresolved environmental issues involved. Ecology was required to determine whether the expansion would meet state water quality standards by assessing direct, indirect, and cumulative impacts on wetlands, stormwater, and streamflow, while coordinating with federal Clean Water Act permit requirements under Sections 401 and 402. As of October 2000, key aquatic resource protection issues—including stormwater management, wetland mitigation, and streamflow augmentation—remained unresolved pending additional information from the Port of Seattle.

Port of Seattle technical appendices (Volume 2) to the study examining effects of runway deicing on dissolved oxygen (DO) in receiving waters at Seattle-Tacoma International Airport, covering the 1999-2000 winter season. Includes QA/QC and field methods for Hydrolab instruments, Northwest Ponds DO profile data collection, continuous monitoring data assessment, tracer plots for each monitoring location,

Washington State Department of Ecology Water Quality Program Permit Writer’s Manual, Publication Number 92-109, revised January 2001, prepared by Gary Bailey. Covers NPDES permit writing procedures and water quality standards for Washington State. AR 032664, Exhibit-2077.

Washington Administrative Code (WAC) 173-201A sections 030, 040, 050, and 060 covering water quality standards for surface waters in Washington State, published by the Washington State Department of Ecology. Exhibit 113 (AR017890–AR017892) includes: lake total phosphorus (TP) nutrient criteria by ecoregion (Cascades, Columbia Basin, Willamette, East Cascade Foothills, Blue Mountain) with trophic state classifications (ultra-oligotrophic,

The 2000 Puget Sound Water Quality Management Plan, adopted December 14, 2000, outlines coordinated local, state, tribal, and federal actions to restore and protect the health of Puget Sound in Washington State. The plan introduces new programs addressing aquatic nuisance species and Georgia Basin water coordination, while substantially revising existing stormwater, habitat, and wetlands protection programs. It builds on earlier management plans dating back to 1987 and calls for renewed commitment to funding and policy improvements.

Wetland Functional Assessment and Impact Analysis prepared by Parametrix, Inc. for Port Of Seattle, Seattle-Tacoma International Airport, December 2000 (project number 556-2912-001). AR 048122. Covers wetland delineation, functional assessment, and impact analysis for Master Plan Update Improvements including Runway Safety Areas, relocation of South 154th Street, new Third Runway, borrow areas, and South Aviation Support

Section 4.5.2 of the Comprehensive Stormwater Management Plan for STIA Master Plan Update Improvements, December 2000, Port of Seattle. Documents stormwater quality monitoring data from SDS outfalls (1994–2000) under NPDES Permit requirements. Table 4-8 compares STIA runoff quality against regional and national urban stormwater benchmarks including Bellevue Sturtevant Creek, Bellevue Urban Runoff Program (BURP), King

Memorandum dated November 27, 2000 from Dave Garland, NWRO Water Quality, Washington State Department of Ecology, to Ann Kenny and Kevin Fitzpatrick regarding Sea-Tac Third Runway Borrow Area 3 wetland impacts. Addresses Port Of Seattle proposal to excavate sand and gravel from Borrow Area 3 south of Sea-Tac Airport for Third Runway fill embankment. References

Memorandum dated November 27, 2000 from Dave Garland, NWRO Water Quality Program, Washington State Department of Ecology, to Ann Kenny (Shorelands and Environmental Assessment Program) and Kevin Fitzpatrick (Water Quality Program). Subject is wetland hydrology impacts from Port Of Seattle’s proposed excavation of Borrow Area 3 sand and gravel fill for the Sea-Tac Third Runway