Notes
Stantec consultant team report (Section 9, Appendix A, pages A-224 to A-246) from the 2019 Department of Commerce Sea-Tac Airport Communities Impact Study, dated 29 May 2020. Covers geologic, soil, and groundwater analytical data at and near Seattle-Tacoma International Airport (KSEA) from 1997 to 2019, focusing on benchmark years 1997, 2009, and 2019. Topics include Vashon Till geology, Puget Sound Lowland glacial framework, chemicals of interest (COIs), PFAS, petroleum hydrocarbons, airport remediation under Washington Department of Ecology Model Toxics Control Act (MTCA) Agreed Order, former Continental-Olympic-United Fuel Farm (Facility/Site #2294, VCP #NW2300), black soot on private property, stormwater runoff, leaking underground storage tanks (LUSTs), NPDES permits, and off-airport groundwater migration. Data sources include Port Of Seattle groundwater studies (2008, 2015), Washington Ecology EIM and PARIS databases, Ecology Toxic Cleanup Program, Environmental Data Resources (EDR), cities of Burien, Des Moines, Federal Way, Normandy Park, SeaTac, and Tukwila, and the 2007 CDP Final EIS and 1996/1997 Master Plan EIS documents.