TagMiller Creek(260)

A fisheries biologist hired by the Airport Communities Coalition argues that the Port of Seattle has not provided sufficient scientific evidence to justify a Clean Water Act Section 404 permit for its proposed third runway project at Seattle-Tacoma International Airport. The report concludes that the Port's plans would harm wetlands, streams, and fish populations—including federally threatened Chinook salmon—in the Miller Creek, Walker Creek, and Des Moines Creek watersheds through contaminated fill, toxic stormwater runoff, and the rerouting of Miller Creek. The biologist urges the U.S. Army Corps of Engineers to require additional environmental studies and water quality modeling before any permit decision is made.

A water resources expert hired by the Airport Communities Coalition reviewed the Port of Seattle's stormwater management plan for Sea-Tac Airport expansion and found serious water quality concerns. The review concluded that the plan would harm surrounding streams and aquifers, that existing pollution controls were already failing to meet Washington State water quality standards, and that the proposed measures offered no reasonable assurance of future compliance. The expert recommended denial of both the Clean Water Act Section 401 certification and the Section 404 permit approval.

A February 2001 technical review letter from Northwest Hydraulic Consultants, submitted on behalf of the Airport Communities Coalition, raises concerns about the stormwater management plan for Seattle-Tacoma International Airport's proposed third runway expansion. The letter identifies deficiencies in hydrology and hydraulics analyses, inconsistencies in stormwater detention standards, and the lack of a clear independent review process for the complex project. Reviewers warn that without stricter oversight and well-defined engineering requirements, the development risks significant adverse impacts to local streams and wetlands, particularly Miller Creek and Des Moines Creek.

Sheldon & Associates letter dated February 15, 2001, responding to public notice comments regarding the Seattle-Tacoma International Airport Masterplan Update Projects Section 404/401 Permits. Addresses movement of water through embankment fill and Mechanically Stabilized Earth (MSE) wall, drainage layer design to prevent excess pore pressures, rock underdrain clogging prevention using Group 1A filter material, shallow

A February 2001 technical review letter from Northwest Hydraulic Consultants, submitted on behalf of the Airport Communities Coalition, raises serious concerns about the stormwater management plans for Seattle-Tacoma International Airport's proposed third runway expansion. The review identifies multiple technical deficiencies in the project's hydrology and drainage designs, warning that they could cause significant adverse impacts to local streams and wetlands, particularly Miller Creek and Des Moines Creek. The letter also criticizes the lack of clearly defined stormwater control standards, absence of independent design review processes, and failure to provide financial guarantees for implementing the stormwater management plan.

A 2001 environmental review letter from Sheldon & Associates, commissioned by the Airport Communities Coalition, challenges the Port of Seattle's technical documents for the proposed Third Runway at Seattle-Tacoma International Airport. The review finds that the Port has not adequately demonstrated that massive fill placement and engineered retaining walls would avoid long-term damage to downslope wetlands, groundwater flows, and Miller Creek. Key unresolved concerns include the reliability of the proposed underdrain system, incomplete baseline data, and the lack of independent construction oversight.

Email dated February 8, 2001 from Ann Kenny (Ecology Senior Environmental Specialist) to Andrea Grad, Peter Eglick, and Kevin Stock responding to PDA requests regarding Chapter 173-175 WAC Dam Safety review of Port Of Seattle Third Runway stormwater facilities. Covers ISW Lagoon #3, 25.5 acre-foot pond (SDW1A), 37.91 acre-foot pond (SDW1B), MSE wall Dam Safety

Letter dated February 8, 2001 from Hart Crowser Principal Geotechnical Engineer to U.S. Army Corps of Engineers (Jonathan Freedman) and Washington State Department of Ecology (Ann Kenny), documenting comments made at the January 26, 2001 public hearing on 404/401 permit applications J-4978-30-06. Comments focus on the design and independent technical review of mechanically stabilized earth

Exhibit 2059 (AR 031711–031713, ECY00010776–10778). Email from Gus Ordonez to Ann Kenny dated February 7, 2001, transmitting a memorandum from Jerald LaVassar, M.S., P.E. to Tom Luster reviewing the report ‘Evaluation of Retaining Wall/Slope Alternatives to Reduce Impacts to Miller Creek, Embankment Station 174+00 to 186+00’ for the Third Runway project at Sea-Tac International Airport.

U.S. Army Corps of Engineers Public Notice (Reference 1996-4-02325, dated 17 January 2001) amending the second revised public notice dated 27 December 2000 for a Department of the Army Section 404 Clean Water Act permit application by Port Of Seattle. Project located in Miller Creek, Walker Creek, and Des Moines Creek watersheds and wetlands at