TagPollution Control Hearings Board(1532)

Memorandum dated August 7, 2001 from Dave Garland, NWRO Water Quality Watershed Unit Supervisor, to Ann Kenny, Kevin Fitzpatrick, and Ray Hellwig of the Washington State Department of Ecology Northwest Regional Office. Reviews the Parametrix Inc. July 2001 report ‘Low Flow Analysis, Flow Impact Offset Facility Proposal’ prepared for Port Of Seattle regarding predicted impacts

Department of Ecology memorandum dated August 7, 2001, from Director Tom Fitzsimmons to Governor Gary Locke, briefing on Ecology’s decision to approve with conditions a 401 Water Quality Certification to Port Of Seattle for construction of a third runway at Seattle-Tacoma International Airport (Sea-Tac Airport). Covers project impacts including 18.37 acres of wetlands, 980 linear

Memorandum dated August 7, 2001 from Dave Garland, NWRO Water Quality Watershed Unit Supervisor, Washington State Department of Ecology, to Ann Kenny, Kevin Fitzpatrick, and Ray Hellwig, reviewing Parametrix Inc.’s July 2001 “Low Flow Analysis, Flow Impact Offset Facility Proposal” prepared for the Port Of Seattle regarding the proposed third runway at Sea-Tac Airport. Reviews

Memorandum dated August 7, 2001, from Katie Walter (Shannon & Wilson, Inc.) to Ann Kenny (Washington State Department of Ecology) regarding draft 401 conditions for the Port Of Seattle Natural Resource Mitigation Plan (NRMP), marked Deliberative — Do Not Disclose. Covers Auburn mitigation site culvert placement issues from the June 28, 2001 revised grading plan,

Memorandum dated August 7, 2001, from Katie Walter (Shannon & Wilson, Inc.) to Ann Kenny (Washington State Department of Ecology), marked ‘Deliberative – Do Not Disclose,’ regarding draft 401 conditions for the Port Of Seattle Natural Resources Mitigation Plan (NRMP), Auburn Mitigation Site. Document addresses culvert placement issues in the revised grading plan (June 28,

Draft memorandum dated 8/6/01 from Ray Hellwig, Director, Washington State Department of Ecology, to Tom Fitzsimmons, Director, recommending approval of a 401 Water Quality Certification for the Port Of Seattle’s Sea-Tac International Airport Third Runway project. Document covers 8,500-foot parallel third runway, Runway Safety Areas (RSAs), South Aviation Support Area (SASA), impacts to approximately 700

In August 2001, GeoSyntec Consultants submitted technical comments to the U.S. Army Corps of Engineers and Washington State Department of Ecology raising serious concerns about the geotechnical safety analyses for the proposed Third Runway expansion at Seattle-Tacoma International Airport. The firm identified multiple flaws in the design work performed by the Port of Seattle's consultants, including underestimation of earthquake risk, incorrect seismic stability analyses, and overestimation of post-earthquake soil stability. GeoSyntec concluded that the Port's consultants had not adequately demonstrated that the embankment fill and retaining wall structures would perform safely under anticipated seismic loads over the facility's lifetime.

A technical review letter from Northwest Hydraulic Consultants, written on behalf of the Airport Communities Coalition, raises serious concerns about the Port of Seattle's Low Flow Analysis related to the proposed 3rd runway at SeaTac Airport. The letter identifies the July 23, 2001 document as incomplete and inconsistent with other project plans, citing missing sections, absent facility drawings, and unresolved questions about how water storage and release systems would function in practice. Key technical issues flagged include inadequate accounting for water transit losses, potentially impractical small-orifice flow controls, and poor calibration of streamflow models for Walker Creek.

This August 2001 letter from Northwest Hydraulic Consultants, submitted on behalf of the Airport Communities Coalition, raises technical concerns about the Port of Seattle's Low Streamflow Analysis for the proposed Sea-Tac Airport third runway project. The letter argues the Port's document is incomplete, inconsistent with the Stormwater Management Plan, and lacks critical design details needed to demonstrate that impacts to low streamflows in Walker, Des Moines, and Miller Creeks will be adequately mitigated. Key issues identified include missing sections in the analysis report, unaddressed impacts from airport expansion activities, conflicting information about proposed storage facilities, and failure to account for water transit losses during dry periods.

Email from Katie Walter (KLW@shanwil.com) to Ann Kenny (Ecology), forwarded to Erik Stockdale, dated August 6, 2001, marked ‘Do not Disclose Deliberative’ (AR 018322, DOE 8/13/01 0251). Discusses outstanding issues in a draft permit or approval for Port Of Seattle wetland mitigation, including mitigation ratios, construction oversight team, web site/CD-ROM for document availability, restrictive covenants