TagACC(1548)

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.

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

A December 7, 2000 letter from the Port of Seattle to the Washington Department of Ecology responds to questions raised at a November 16, 2000 meeting regarding the Seattle-Tacoma International Airport Ground Water Study conducted under Agreed Order #97TC-122. The letter addresses the completion status of various research tasks, including hydrogeological surveys, contamination site identification, groundwater flow modeling, and pollution prevention for underground storage tank systems. The Port agrees with some of Ecology's assessments of incomplete tasks while disputing others, and clarifies its position on the scope of work required under the agreement.

Hart Crowser draft geotechnical engineering report (J-4978-28) prepared for HNTB, December 4, 2000, addressing the Third Runway embankment at Seattle-Tacoma International Airport, SeaTac, Washington. Covers embankment fill materials, slope stability analyses, foundation instability, subgrade improvements, liquefaction analysis (175-year and 475-year seismic events), FLAC deformation modeling, MSE walls (North Satellite Area, West, South), Phase 4 fill,

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

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.

Wetland Functional Assessment and Impact Analysis prepared by Parametrix, Inc. (Kirkland, Washington) for Port Of Seattle, Seattle-Tacoma International Airport, December 2000, project number 556-2912-001 (03). Document filed in PCHB No. 01-133, received October 1, 2001 by Environmental Hearings Office, submitted as part of Port of Seattle’s Memo Opposing ACC’s Motion for Stay, Declaration of James

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,

Final Natural Resource Mitigation Plan prepared by Parametrix, Inc. for Port Of Seattle covering Master Plan Update Improvements at Seattle-Tacoma International Airport, dated December 2000. Filed as part of PCHB No. 01-133, Port of Seattle’s memo opposing ACC’s motion for stay, Volume 3 of 3, received by Environmental Hearings Office on October 1, 2001. Includes