TagSea-Tac Airport(1835)

This technical document describes hydrological modeling conducted for the Seattle-Tacoma International Airport (Sea-Tac) Master Plan Update, focusing on stormwater runoff analysis for Des Moines Creek, Miller Creek, and Walker Creek subbasins. It details the calibration of computer models using rainfall and evaporation data spanning October 1948 through September 1996, along with parameters for airport embankment fill materials. The analysis was used to evaluate future stormwater detention facility requirements associated with airport expansion projects, including the Third Runway.

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

This December 2000 report by Parametrix, Inc. for the Port of Seattle presents a Comprehensive Stormwater Management Plan for Master Plan Update improvements at Seattle-Tacoma International Airport. It maps the airport's drainage basins, surrounding watersheds (including the Duwamish River, Des Moines Creek, and Miller Creek watersheds), and identifies pollution-generating and non-pollution-generating surfaces across the airport property. The plan outlines water quality treatment strategies for existing and proposed impervious surfaces to manage stormwater runoff from airport operations.

The Industrial Wastewater System (IWS) at Seattle-Tacoma International Airport was built in 1963 to collect and treat runoff from airport aprons, taxiways, hangars, and maintenance areas that may be contaminated by fuel spills, de-icing chemicals, and aircraft wash water. The system channels wastewater through two main drainage areas to an on-site treatment plant, with treated water ultimately discharged into Puget Sound under an NPDES permit. Ongoing upgrades aim to expand the system's capacity to handle a 25-year design storm event.

Comprehensive Stormwater Management Plan (SMP) prepared by Parametrix, Inc. for the Port of Seattle, Seattle-Tacoma International Airport (STIA) Master Plan Update Improvements, December 2000, project number 556-2912-001(28). Document includes a July 2001 preface with replacement pages developed in response to Washington State Department of Ecology (Ecology) comments on Volumes 1 through 4. Covers stormwater management,

Draft Subsurface Conditions Data Report for Phase 4 Fill of the Third Runway Embankment at Sea-Tac International Airport, prepared by Hart Crowser (HartCrowser) for Port of Seattle and HNTB, dated November 29, 2000, project J-4978-28, AR 046207. Report covers generalized geologic conditions, subsurface soil conditions, hydrogeologic conditions, field exploration methods including auger borings, Standard Penetration

Letter dated November 27, 2000 from Samuel R. Casne, Natural Resources Manager at Shannon & Wilson, Inc., to Erik Stockdale of the Washington State Department of Ecology (Shorelines & Environmental Assistance Program) in Bellevue, WA, proposing consulting services for review of the Natural Resource Mitigation Plan (NRMP) for the SeaTac Third Runway Project. The proposal,

Letter dated November 22, 2000 from Bill Garrity, Executive Director of the Consulting Engineers Council of Washington (CECW), to Erik Stockdale at the Washington Department of Ecology (AR 018492–018493). The letter addresses the Request for Bid (RFP dated November 14, 2000) for review of the Natural Resource Mitigation Plan (NRMP) for the SeaTac Third Runway

Letter and proposal from Dyanne Sheldon, Principal of Sheldon & Associates, Inc. (Seattle, WA), addressed to Erik Stockdale at Washington State Department of Ecology, dated November 21, 2000, submitting a proposal to review the Natural Resource Mitigation Plan (NRMP) for the Sea-Tac Third Runway. The letter discusses cost estimate exceeding the provided $18,000 budget, justifying

This document contains the revised agenda for the first Technical Review Board (TRB) meeting held November 16-18, 2000, concerning the Seattle-Tacoma International Airport Third Runway Project. The three-day meeting covered geotechnical and engineering topics including subsurface conditions, subgrade improvements, seismic design, MSE wall design, and general embankment fill. The agenda also included a site tour and a session for the TRB to summarize comments and recommendations on the adequacy of investigations and construction methods.