TagACC(1534)

In July 1998, the Washington State Department of Ecology issued a Water Quality Certification and Coastal Zone Consistency Determination (Order #96-4-02325) to the Port of Seattle for construction of a third runway and other improvements at Seattle-Tacoma International Airport. The project would impact between 8 and 12 acres of wetlands, 980 linear feet of Miller Creek, and 2,280 linear feet of unnamed tributaries, requiring mitigation measures including stormwater management enhancements, stream restoration, floodplain improvements, and construction of 16 to 24 acres of replacement wetlands in Auburn, Washington. The certification was granted with specific conditions and penalties for non-compliance, reflecting concerns about environmental damage to local waterways.

A July 1998 draft report prepared by Parametrix, Inc. for the Port of Seattle outlines a Stormwater Quality Management Plan for Sea-Tac International Airport's Master Plan improvements, including the proposed Third Runway. The plan documents why the Port chose bioswales over other Best Management Practice (BMP) alternatives, such as underground vaults, for managing stormwater runoff quality. The document was shared internally via email between Parametrix engineer Ken Ludwa and Jim Thomson for review and comment.

King County Superior Court Memorandum Ruling by Judge Robert H. Alsdorf on Application of WAC Chapter 365-195 (Procedural Criteria for Adopting Comprehensive Plans and Development Regulations) in consolidated cases No. 96-2-20357-2 KNT, No. 97-2-13908-2 KNT, No. 97-2-22276-1 KNT, No. 98-2-04911-1 KNT. City of Des Moines, Airport Communities Coalition, and other plaintiff-petitioners argued against the Port

A 1998 internal email exchange between Ken Ludwa and Kerry Ritland discusses edits to Section 4.3 of a stormwater management report related to Sea-Tac Airport. The section covers water quality facilities, explaining that new stormwater detention facilities would follow state Ecology guidelines using biofiltration and permanent water quality storage, while also complying with the Port's NPDES permit and Stormwater Pollution Prevention Plan (SWPPP). Ken Ludwa agreed to edit the section to reference Appendix F – Water Quality BMP Analysis once that appendix was further developed.

Memorandum from Ken Ludwa (Parametrix, Inc.) to Paul Fendt dated July 1, 1998, project number 55-2912-01, describing results of a Reasonable Potential Analysis (RPA) for the STIA Third Runway area stormwater runoff. Analysis conducted at a working meeting with Lisa Zinner (Ecology), Lori Terry (Preston, Gates, and Ellis), Tom Hubbard (POS), John Rogers (CH2M Hill),

King County Superior Court Findings of Fact, Conclusions of Law and Final Order by Judge Robert H. Alsdorf in consolidated cases No. 96-2-20357-2 KNT, No. 97-2-13908-2 KNT, No. 97-2-22276-1 KNT, No. 98-2-04911-1 KNT. Challenges Port Of Seattle Resolutions 3212 and 3245 approving the Sea-Tac Master Plan Update including construction of a third runway at Seattle-Tacoma

A July 1, 1998 internal email from Ken Ludwa to Paul Fendt outlines preliminary cost estimates for a StormFilter stormwater treatment system, based on a discussion with a VP of Stormwater Management. A 100 cfs system handling approximately 4,700 cartridges would cost roughly $2.3 million to design and build, while an 80 cfs system would cost approximately $1.8 million to build with $150,000 annually for cartridge replacement. Cartridge costs vary depending on total suspended solids (TSS) levels and rainfall, as cartridges are replaced on an as-needed basis.

A 1998 internal memo from Parametrix, Inc. summarizes the results of a Reasonable Potential Analysis (RPA) conducted for the Seattle-Tacoma International Airport (STIA) Third Runway project, assessing whether stormwater runoff from the new runway could exceed water quality criteria in Miller Creek and Des Moines Creek. The analysis found that most pollutant concentrations after treatment with best management practices (BMPs) such as bioswales, sand filters, and wet ponds would meet criteria, with the exception of copper, which remained above acceptable levels. The memo also notes that existing pollutant concentrations in the receiving waterways during storms already exceeded criteria, even before accounting for Third Runway runoff.

A July 1, 1998 memorandum from Parametrix, Inc. summarizes the results of a Reasonable Potential Analysis (RPA) conducted for the Seattle-Tacoma International Airport (STIA) Third Runway project, assessing stormwater runoff quality against water quality criteria for Miller Creek and Des Moines Creek. The analysis found that most pollutant concentrations after treatment with best management practices (BMPs) such as bioswales, sand filters, and wet ponds would meet criteria, with the exception of copper, which remained above acceptable levels. The memo also notes that during storms, pollutant concentrations already present in the receiving waters exceeded criteria and were higher than those predicted from Third Runway stormwater runoff.

Draft Stormwater Quality Management Plan (Appendix F) prepared by Parametrix, Inc. for Port Of Seattle, July 1998, as part of the Preliminary Comprehensive Stormwater Management Plan for Sea-Tac Airport Master Plan Improvements. Covers existing drainage conditions including Storm Drain System (SDS) and Industrial Waste System (IWS), Miller Creek and Des Moines Creek receiving systems, existing