TagThird Runway(1098)

Sea-Tac Runway Fill Hydrologic Studies Report (AR 045023, project JE9907) prepared by Pacific Groundwater Group, Ecology and Environment, and Earth Tech Inc. for Washington State Department of Ecology Northwest Regional Office, dated June 19, 2000. Report covers hydrologic and hydrogeologic characterization of the Sea-Tac Airport third runway embankment fill area, including Miller Creek and Walker

This June 2000 Biological Assessment, prepared by Parametrix, Inc. for the Federal Aviation Administration and Port of Seattle, evaluates the potential environmental impacts of proposed Master Plan Update Improvements at Seattle-Tacoma International Airport on federally listed species. The report examines effects on aquatic resources including Chinook salmon, bull trout, and their critical habitats within nearby waterways such as Miller Creek, Des Moines Creek, and the Green River. It was prepared to support Section 7 consultation under the Endangered Species Act with the U.S. Fish and Wildlife Service and National Marine Fisheries Service.

Email from Andy McMillan (SEA program) dated June 12, 2000, forwarded by Tom Luster to Raymond Hellwig on October 6, 2000, transmitting the official version of a Word document titled “Lessons Learned from Big Projects: Recommendations for SEA Program.” The attached document outlines 7 recommendations developed from SEA program staff experiences with large, complex projects

A fisheries biologist hired by the Airport Communities Coalition assessed the potential environmental impacts of a temporary SR-509 interchange construction project near Seattle-Tacoma International Airport, concluding that the project posed serious risks to fish and wetland resources in Walker Creek. The report found that proposed erosion control measures, such as silt fences and whattles, were grossly inadequate given the steep terrain (slopes of 40–60%) adjacent to Wetlands 43 and 44, and that sediment-laden stormwater runoff containing metals and polycyclic aromatic hydrocarbons would likely reach these sensitive areas. The biologist also criticized the Port of Seattle and its contractor, Parametrix, Inc., for failing to conduct fish species inventories and for providing little documentation to support their claim that no significant wetland impacts would occur.

Hart Crowser draft subsurface conditions data report (project J-4978.21) prepared for Port Of Seattle and HNTB, June 2000, covering the West MSE (Mechanically Stabilized Earth) Wall for the Third Runway Embankment at Sea-Tac International Airport. Report includes generalized geologic conditions, subsurface soil conditions, consolidation test results, CU and UU triaxial compression test results, hydrogeologic conditions,

Hart Crowser report (J-4978-22) prepared for HNTB, June 2000, analyzing preliminary stability and settlement for subgrade improvements supporting Mechanically Stabilized Earth (MSE) walls at the Sea-Tac Airport Third Runway Project. Covers three MSE wall locations — North Safety Area, West MSE Wall, South MSE Wall — with analysis of subgrade improvement alternatives including overexcavation and

These internal deliberative notes from 5/30/00 discuss fill and stormwater management issues related to a construction or development project, covering topics such as soil fill acceptance criteria, Best Management Practices (BMPs) for water quality, spill containment features at Tyee Pond, and monitoring requirements for dissolved metals. The notes reference coordination among multiple regulatory frameworks including Section 401, CZM, and MTCA, and address questions about impervious liner hydrologic impacts and remediation procedures. Key action items include developing an approved stormwater plan, establishing soil sampling protocols for borrow sites, and determining upfront versus incremental BMP implementation strategies.

This document summarizes soil contamination test results for fill material taken from the First Avenue Bridge site, collected between October 1999 and May 2000. Samples were tested for petroleum hydrocarbons (diesel and heavy oil ranges) as well as RCRA 8 metals and other contaminants, with results indicating varying levels of heavy oil detected across samples. The table notes which soil samples were ultimately placed at the Third Runway construction site at Sea-Tac Airport, with several samples excluded due to contamination concerns.

A professional wetland scientist reviewed the construction plans for a temporary SR509 interchange near Seattle-Tacoma International Airport and concluded that the project would cause harmful sediment-laden stormwater runoff to discharge into nearby Wetland 43. The report found that the wetland boundary was significantly closer to the construction zone than project documents indicated, and that the steep slopes and sparse vegetation of the construction site made sediment runoff unavoidable. The scientist determined that the planned temporary erosion control measures were inadequate to protect the wetland, particularly during unexpected storm events.