TagACC(1534)

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.

Handwritten notes from a SeaTac internal meeting on 5-23-00 (AR 018449, Exhibit 180), attended by Jeannie, Ray H., Tom L., Joan M., John Glynn, Kevin P., and Paula Chlos. Topics include resolving conflicts between wildlife hazard plan and mitigation plan, sideboard definitions needed; need for ETA statement on conflict with circular and whether it meets

A May 2000 environmental science review raised concerns that construction of a temporary highway interchange near Seattle-Tacoma International Airport's third runway would cause direct sediment runoff into the adjacent Wetland 43. The report found that the wetland boundary was up to 50 feet closer to the construction zone than project documents indicated, and that the steep slopes and inadequate erosion controls would fail to prevent sediment-laden stormwater from damaging the wetland's water quality and aquatic habitat.

Letter dated May 22, 2000 from Elizabeth Leavitt, Manager of Aviation Environmental Programs at Port Of Seattle, to Tom Luster at Washington Department of Ecology (Environmental Coordination Section), withdrawing the December 6, 1999 CZMA Consistency Statement and simultaneously submitting a new one to reset the six-month review period under 33 C.F.R. Sec. 325.2. The withdrawal

Email dated May 19, 2000 from Raymond Hellwig (City of Des Moines) to Thomas Fitzsimmons regarding the SeaTac 3rd Runway permitting process. Discusses tight July 2000 decision-making timeframe, King County review of Port Of Seattle stormwater management plan requiring up to 10 more weeks, development of a definitive issues list for the proposed runway, drafting

Email from Raymond Hellwig to Thomas Fitzsimmons dated May 19, 2000, regarding the SeaTac Third Runway permitting process and July 2000 decision-making timeframe. Discusses King County review of Port Of Seattle stormwater management plan requiring up to 10 more weeks, internal staff meetings to develop a definitive issues list, drafting 401 language for resolved issues,

Raymond Hellwig (Washington State Department of Ecology) emails Joe Dear and colleagues on May 15, 2000, as an addendum to a memo preparing for a May 16 meeting with Port Of Seattle regarding the Sea-Tac Third Runway. Explains that the one-year 401 Water Quality Certification evaluation period restarted September 1999, with a possible July 2000