Questions and comments regarding the draft Transportation and General Conformity Determination for the Sea-Tac Airport Master Plan Update Draft, Final and Draft Supplemental Environmental Impact Statements

A 1997 public comment letter submitted to the FAA's Northwest Region raises detailed technical questions about the air quality conformity determination for the Sea-Tac Airport Master Plan Update. The author challenges the accuracy of pollution emission estimates, questions why the project may be exempt from conformity review despite existing exceedances of CO, NO₂, and PM₁₀ standards, and calls for a more thorough cumulative analysis of health impacts on nearby residents. The letter requests that the FAA address discrepancies in nitrogen oxide modeling, ozone precursor emissions, and particulate data before finalizing the Supplemental Environmental Impact Statement.

Notes

A letter submitted as Attachment #1 to the FAA Northwest Region containing 25 detailed questions and comments regarding the draft Air Quality Conformity Determination for the Sea-Tac Airport Master Plan Update SEIS. The author raises concerns about exemptions from conformity review despite existing and modeled exceedances of CO, NO2, and PM10 standards, inconsistencies in pollution inventory data, ozone modeling omissions, and the adequacy of dispersion analysis for nearby communities.

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