TagStormwater(385)

Annual Stormwater Monitoring Report prepared by Port Of Seattle pursuant to Special Condition S2.E of the NPDES permit for Seattle-Tacoma International Airport (STIA), covering July 1, 2000 through June 30, 2001. Report covers 14 outfalls per permit condition S2.B; 61 grab and 59 composite samples from 22 storm events; 7-year cumulative totals exceed 400 samples

Hart Crowser prepared this Final Draft Conceptual Borrow Material Development and Reclamation Plan for Borrow Areas 3 and 4 at Sea-Tac International Airport, City of SeaTac, Washington, for the Port Of Seattle, dated August 15, 2001 (project number 4978-65). The plan covers site preparation, excavation practices, reclamation, revegetation, weed control, stormwater management, and wetland protection

Draft memorandum dated 8/13/01 from Ray Hellwig, Director, to Tom Fitzsimmons, Director, Washington State Department of Ecology, recommending approval of a 401 Water Quality Certification for the Port Of Seattle Sea-Tac International Airport (STIA) Third Runway and related projects. Document AR028003 covers the Port’s proposals to construct an 8,500-foot parallel third runway, two Runway Safety

Dr. Peter Willing, a water resources expert, submitted this declaration opposing the Department of Ecology's water quality certification for Sea-Tac Airport's proposed third runway construction. He argues that the certification relies on vague future performance expectations and unresolved contingency plans that fail to provide reasonable assurance that water quality standards will be met. His key concerns include the Port of Seattle's flawed low streamflow analysis and inadequate stormwater management plans that could perpetuate ongoing water quality violations in nearby Class AA streams.

Washington State Department of Ecology news release (AR027998, dated August 10, 2001) approving the Port Of Seattle’s water-quality certification permit under the federal Clean Water Act for construction of a third runway at Seattle-Tacoma International Airport. The permit covers stormwater management for Des Moines, Miller, and Walker creeks; filling of nearly 20 acres of wetlands;

Confidential discussion draft press release (01-138 DRAFT, dated August 9, 2001) from Washington State Department of Ecology (Ecology) announcing approval of Port Of Seattle’s 401 water-quality certification permit under the federal Clean Water Act to construct a third runway at Seattle-Tacoma International Airport. The permit includes conditions covering stormwater management (15 major ponds and vault

Fax cover sheet dated 8/9/01 from Ralph Wessels (Port Of Seattle, 3rd Runway/Airfield, Westside Office, 1006 S 170th, Seatac WA 98148) to Ann Kenny at Washington State Department of Ecology (fax 425-649-7088), requesting attached documents. Attached is an April 4, 2001 certified mail letter from Ecology to Ralph Wessels granting coverage under the Stormwater General

Department of Ecology memorandum dated August 7, 2001, from Director Tom Fitzsimmons to Governor Gary Locke, briefing on Ecology’s decision to approve with conditions a 401 Water Quality Certification to Port Of Seattle for construction of a third runway at Seattle-Tacoma International Airport (Sea-Tac Airport). Covers project impacts including 18.37 acres of wetlands, 980 linear

This August 2001 letter from Northwest Hydraulic Consultants, submitted on behalf of the Airport Communities Coalition, raises technical concerns about the Port of Seattle's Low Streamflow Analysis for the proposed Sea-Tac Airport third runway project. The letter argues the Port's document is incomplete, inconsistent with the Stormwater Management Plan, and lacks critical design details needed to demonstrate that impacts to low streamflows in Walker, Des Moines, and Miller Creeks will be adequately mitigated. Key issues identified include missing sections in the analysis report, unaddressed impacts from airport expansion activities, conflicting information about proposed storage facilities, and failure to account for water transit losses during dry periods.

A technical review letter from Northwest Hydraulic Consultants, written on behalf of the Airport Communities Coalition, raises serious concerns about the Port of Seattle's Low Flow Analysis related to the proposed 3rd runway at SeaTac Airport. The letter identifies the July 23, 2001 document as incomplete and inconsistent with other project plans, citing missing sections, absent facility drawings, and unresolved questions about how water storage and release systems would function in practice. Key technical issues flagged include inadequate accounting for water transit losses, potentially impractical small-orifice flow controls, and poor calibration of streamflow models for Walker Creek.