TagACC(1531)

This December 2000 email from Northwest Hydraulic Consultants summarizes technical concerns about Seattle-Tacoma International Airport's Industrial Wastewater System (IWS) and its effects on local waterways. The consultants warn that diverting large areas of stormwater runoff to the IWS is reducing natural water flows to Walker Creek and Des Moines Creek, and that lining the IWS storage lagoons may further diminish groundwater base flows to those streams. Additional concerns include undersized detention facilities, lack of continuous simulation modeling, and unresolved conflicts with FAA wildlife guidelines related to the proposed Third Lagoon expansion.

A scientist retained by the Airport Communities Coalition wrote to the EPA in December 2000, raising serious concerns about the Port of Seattle accepting contaminated fill materials for the proposed Third Runway project at Seattle-Tacoma International Airport. The letter argues that the Port improperly used Washington State's Model Toxics Control Act (MTCA) cleanup standards as fill acceptance criteria, when those standards were designed to clean up existing contaminated sites, not to permit introducing pollution onto previously clean land. The scientist also criticizes the Port's soil testing methods as statistically inadequate to detect the true extent of contamination, warning that chemicals in the fill could leach into groundwater, wetlands, and surface water including Miller Creek.

This December 2000 Comprehensive Stormwater Management Plan, prepared by Parametrix, Inc. for the Port of Seattle, outlines how Seattle-Tacoma International Airport planned to manage stormwater runoff as part of its Master Plan Update improvements. The plan covers water quantity and quality standards, drainage basin conditions, hydrologic modeling, and best management practices for both existing and future airport development areas. It addresses topics such as detention storage, treatment of industrial wastewater, wildlife safety near detention ponds, and protection of nearby waterways including Miller Creek and Des Moines Creek.

A fisheries biologist hired by the Airport Communities Coalition reviewed the Port of Seattle's permit application for the Miller Creek Relocation Project, raising serious scientific concerns about the proposed construction near Sea-Tac Airport. The review found that the project design lacked supporting scientific citations and calculations, and concluded that summer water temperatures would likely exceed safe levels for cutthroat trout for several years until riparian vegetation matured. Additional concerns were raised about inadequate water flow depths and the risk of the stream running dry due to highly porous spawning gravels used in the channel design.

Floyd & Snider Inc. meeting notes summary (draft for review) covering 401 Permit negotiations between the Port Of Seattle and Washington State Department of Ecology (Ecology) regarding the Sea-Tac Airport Stormwater Master Plan Update and third runway construction, October 2 through November 29, 2000. Document ECY00009383/AR029061 covers technical issues including detention sizing, basin acreage discrepancies,

Memorandum from Reese P. Hastings and Michael J. Bailey, P.E., Hart Crowser, Inc. to Ralph Wessels, Port Of Seattle, dated December 8, 2000, quantifying potential impacts to wetland resources from development of Borrow Areas 1, 3, and 4 and an on-site haul route for the Third Runway embankment at Sea-Tac Airport. Document J-4978-62 details 17

This document summarizes technical negotiation meetings held between October and December 2000 regarding a 401 Water Quality Permit for the Port of Seattle's proposed third runway construction at Sea-Tac Airport. The discussions focused on resolving stormwater management issues, including detention pond sizing, basin hydrology, wetland impacts, and compliance with environmental regulations. A master list of technical issues was maintained jointly by the Port and the Washington State Department of Ecology to track the resolution status of each item prior to permit issuance.

Final draft meeting notes prepared by Kate Snider of Floyd & Snider Inc. from the Sea-Tac Airport Third Runway 401 Permit Negotiations meeting held December 8, 2000. Attendees included representatives from Washington State Department of Ecology (Ray Hellwig, Kevin Fitzpatrick, Ann Kenny, Dave Garland), Port Of Seattle (Elizabeth Leavitt, Michael Cheyne, Keith Smith), King County

Floyd & Snider Inc. meeting notes summary covering Sea-Tac Airport Third Runway 401 Permit negotiations between Port Of Seattle and Washington State Department of Ecology (Ecology), October 2 through December 8, 2000. Documents master list of 401 Permit technical issues including Stormwater Master Plan detention sizing, basin acreage discrepancies, HSPF and KCRTS hydrological models, IWS

Floyd & Snider Inc. meeting notes summary covering 401 Permit negotiations between Port Of Seattle and Washington State Department of Ecology (Ecology) regarding the Sea-Tac Airport Third Runway and Stormwater Master Plan Update, October 2 through December 8, 2000. Document covers wetland issues only and includes a master list of 401 technical issues with resolution