Seattle-Tacoma International Airport SAMP Near Term Projects: Wetlands and Streams Report — Appendix A Background Information

This February 2024 technical report from the Port of Seattle documents the wetlands and streams located at and around Seattle-Tacoma International Airport as part of the Sustainable Airport Master Plan (SAMP). It includes mapped locations of wetlands surveyed across multiple years (2006, 2014, and 2017) along with stream corridors such as Miller Creek, Des Moines Creek, and Walker Creek. Field hydrology monitoring data from 2020 is also provided, recording groundwater depth and soil saturation measurements to assess wetland conditions across the airport property.

Notes

Appendix A background information from the Seattle-Tacoma International Airport (Sea-Tac Airport) Sustainable Airport Master Plan (SAMP) Near Term Projects Wetlands and Streams Report, prepared by Parametrix for the Port Of Seattle, February 2024 (project no. 553-2912-002). Contains Figure A-1 mapping Port of Seattle Natural Resources Geodatabase wetlands and streams data across multiple survey years (2006 pre/post Third Runway, 2014, 2017) and named water features including Walker Creek, Des Moines Creek West, Des Moines Creek East, Gilliam Creek, Miller Creek, and Miller Creek East in King County, WA. Also includes 2020 SAMP hydrology monitoring field data tables with depth-to-water measurements (surface water, water table, saturation) at soil pit locations SP-WLD-1, SP-WLD-2, SP-WLG12-2, SP-WLG12-3, SP-WLG12-8, SP-WLG12-9 and hydrology points Hydro 1–10, collected on 3/13/2020 and 3/25/2020.

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