TagPCHB(607)

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.

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.

A November 2000 letter from the Washington State Department of Ecology to Seattle-Tacoma International Airport summarizes the completion status of environmental tasks required under Agreed Order 97TC-N122. The order mandated a comprehensive groundwater study of the Airport Operations and Maintenance Area (AOMA), including hydrogeological research, contamination mapping, and development of groundwater flow and contaminant transport models. While several research and data-collection tasks were completed, key items such as identifying unknown contamination sources, developing operational groundwater and transport models, and preparing a final Phase I Groundwater Study Report remained incomplete.

A November 2000 memo from Washington State Department of Ecology's Roger Nye raises concerns that the Port of Seattle failed to adequately identify potential soil and groundwater contamination sites at Sea-Tac Airport, as required by an Agreed Order. Nye outlines four key deficiencies, including the Port's failure to account for historical use of chlorinated solvents in aircraft washing, overlooked fueling facilities, and incomplete identification of contamination sources based on historical operations rather than just historical facilities. The memo calls for a thorough, honest effort to identify all potential contamination areas that could pose risks to nearby drinking water wells and surface waters.

This 2000 Washington State Department of Ecology policy document establishes procedures for how stormwater discharges must comply with water quality standards under Sections 401 and 402 of the Federal Clean Water Act. It outlines how Best Management Practices (BMPs), including Supplemental Treatment, should be applied to control stormwater pollution, and defines how compliance decisions are made for various permit types. The policy applies to Ecology Water Quality and SEA Program staff when reviewing or permitting projects that have stormwater impacts.

A October 30, 2000 internal memo from Erik Stockdale of Washington State Department of Ecology outlines recommended tasks for contractor Dyanne Sheldon, who was hired to evaluate the natural resource mitigation plan for a Port project near Sea-Tac Airport. The memo recommends an open-ended 'Time and Materials' contract and calls for a firewall between Sheldon and the Port, citing concerns about the Port playing Ecology and the Army Corps of Engineers against each other. Key tasks include reviewing wetland mitigation plans for the Des Moines, Walker, and Miller creek basins, evaluating stormwater consistency, and drafting Section 401 Clean Water Act permit conditions.

These draft meeting notes from October 27, 2000 document technical negotiations between the Port of Seattle and the Washington State Department of Ecology regarding the 401 Water Quality Permit for Sea-Tac Airport's Third Runway project. The meeting covered key stormwater management topics including detention sizing, base flow impacts, and the Tyee Pond buffer, with participants tracking a master list of technical issues requiring resolution before the permit could be issued. The notes reflect ongoing discussions between agency staff, Port representatives, and engineering consultants to resolve stormwater modeling, hydrology, and environmental compliance questions.

These draft meeting notes from October 27, 2000 document technical negotiations between the Port of Seattle and the Washington Department of Ecology regarding the 401 water quality permit for the Sea-Tac Airport Third Runway project. The meeting covered topics including stormwater management planning, base flow impacts, Tyee Pond buffer requirements, and staffing for permit review. A master list of technical issues was maintained to track which items had been resolved, were pending additional information, or required further discussion.

These are internal deliberative notes from a telephone conversation with Ray Hellwig on October 26, 2000 at 4:50 p.m., discussing the need for consistency between the NAMP and SMP programs, concerns about underestimating the difficulty of technical review, and a decision deadline set for the end of January. The notes also address cumulative impacts described as 'reasonably foreseeable,' a South Access Road and Tyee Pond condition related to DOT and subsequent development, a refusal to permit SAR, consultant oversight of mitigation implementation, and contingency mitigation at a multiplied ratio.

This October 2000 email chain between Washington State Department of Ecology staff discusses coordination efforts regarding the Port of Seattle-SeaTac International Airport Agreed Order (A.O.) and Remedial Action Grant (RAG). The team planned a November meeting with Port of Seattle representatives to confirm completed cleanup work, agree on remaining scope, and address grant-related issues. Key action items included transmitting a Responsiveness Summary to the Port, reviewing billing records, and briefing the Ecology 401 Certification team on progress.