TagThird Runway(1067)

A September 2000 letter from the Airport Communities Coalition to the Washington State Department of Ecology raises concerns about the adequacy of Seattle-Tacoma International Airport's Stormwater Management Plan submitted for 401 Certification. The letter identifies potential flaws in the analysis of base flow impacts on Miller Creek, inconsistencies between the new plan and earlier natural resource mitigation documents, and concerns about proposed changes to watershed basin boundaries. The authors argue that insufficient time was provided for proper review and that the plan fails to fully account for cumulative water quantity impacts of future development.

A September 7, 2000 letter from Northwest Hydraulic Consultants to the Washington State Department of Ecology raises concerns about the adequacy of the Port of Seattle's Stormwater Management Plan for Sea-Tac Airport's Master Plan expansion. The letter identifies significant technical discrepancies in the plan's analysis of baseflow impacts on Miller Creek, questions the reliability of proposed water-rights acquisitions as mitigation, and flags inconsistencies between the stormwater plan and the Natural Resource Mitigation Plan. The consultants also object to the limited time provided for independent review of the four-volume plan and warn that cumulative water quantity impacts of future commercial development in the airport acquisition area have not been adequately assessed.

Draft memorandum J-4978-28 from Hart Crowser (Douglas Lindquist, Barry Chen PhD P.E., Michael Bailey P.E.) to Jim Thomson P.E. at HNTB, dated September 7, 2000, presenting methods and results of liquefaction analyses for the proposed Third Runway embankment and retaining walls at Sea-Tac, Washington. Analyzed 120 borings with Standard Penetration Test (SPT) results from 112

Fax cover sheet and two-page letter dated September 7, 2000 from Richard A. Poulin of Smith & Lowney, P.L.L.C. to Raymond Hellwig (Director, NW Regional Office, Washington Department of Ecology) and Tom Luster (Permit Coordination Unit, Ecology), on behalf of Citizens Against Seatac Expansion (CASE) and Waste Action Project (WAP). Letter transmits a 60-day Notice

This document contains a September 2000 email exchange regarding the proposed expansion of Lagoon #3 in the Sea-Tac Airport Industrial Wastewater System (IWS), in which consultant Bill Rozeboom follows up on unresolved comments submitted to the Washington State Department of Ecology. The attached July 31, 2000 comments raise concerns about discrepancies in the lagoon's design capacity, the risk of frequent overflow into Des Moines Creek, and potential wildlife hazards near aircraft movement areas that may violate FAA guidelines. Additional issues flagged include incomplete construction plans, unaddressed lagoon deficiencies, and the apparent overlap of the lagoon expansion project with 3rd runway construction activities affecting nearby wetlands.

Email chain dated September 5-6, 2000, among Raymond Hellwig, Chung K. Yee, Kevin Fitzpatrick, and Tom Luster (Washington State Department of Ecology Water Quality Program) and paralegal Andrea Grad (Helsell Fetterman) on behalf of ACC (Airport Communities Coalition). Discusses use of contaminated fill for Port Of Seattle Sea-Tac Airport Third Runway project, Method A soil

A water resources consultant submitted comments to the Washington State Department of Ecology in September 2000, raising serious concerns about the Port of Seattle's proposed Des Moines Creek Flow Augmentation Facility, which was intended to mitigate water quality impacts from SeaTac Airport's third runway expansion. The consultant argues the plan is vague and incomplete, lacking secured water sources, hydrologic analysis, and finalized design details. Key technical problems identified include unreliable water temperature from one proposed source, dependence on continuous technological systems, and a disputed well design that may violate state groundwater protection guidelines.

Draft subsurface conditions data report prepared by HartCrowser for HNTB regarding the Third Runway Embankment at Sea-Tac International Airport, project numbers J-4978-23, -26, -27, and -31. Covers additional field explorations and advanced geotechnical testing including auger borings, standard penetration tests (SPT), Shelby tubes, pocket penetrometer, test pits, piezocone penetrometer probes, cone penetration tests (CPT), and

A September 2000 report by Azous Environmental Sciences, commissioned by the Airport Communities Coalition, critically analyzes the Port of Seattle's wetland mitigation plan for the SeaTac Third Runway construction project. The report identifies numerous errors in wetland acreage accounting, inadequate mitigation ratios, and flaws in the proposed compensatory measures, including out-of-basin mitigation that fails to replace lost wetland functions in the affected Miller, Walker, and Des Moines Creek watersheds. The author concludes that the Port's plan falls short of Washington State Department of Ecology standards and the regulatory goal of no net loss of wetland functions.

This September 2000 preliminary design report, prepared by Kennedy/Jenks Consultants for the Port of Seattle, outlines a plan to augment water flow in Des Moines Creek near Seattle-Tacoma International Airport. The report covers facility configuration, process components such as backflow prevention, dechlorination, and aeration systems, as well as an evaluation of chemical dechlorination alternatives. The project was designed to improve creek water quality by treating and releasing water in a controlled manner.