Notes
Table I summarizing analytical results for PFAS (per and polyfluoroalkyl substances) in groundwater at Sea-Tac Airport, prepared by Haley & Aldrich, Inc. in August 2023. Groundwater monitoring wells sampled include LAI-4, MW-01, MW-02, MW-03, T-111-MW-1, TF-MW-01 through TF-MW-08-D, DMC Augmentation Well, and Tyee Well, with sample dates ranging from March 2019 to April 2023. Analytes include PFOS, PFOA, PFNA, PFHpA, PFHxS, PFHxA, PFBS, PFDA, PFDoDA, PFTeDA, PFTrDA, PFUnDA, NEtFOSAA, and MeFOSAA, reported in ng/L; concentrations of PFOS up to 8,200 ng/L and PFHpA up to 3,900 ng/L detected at LAI-4 and MW-02. Coordinates in NAD83 Washington State Planes, North Zone. Data obtained via FOIA request.