EXH1190045628

The Sea-Tac Runway Fill Hydrologic Studies Report (Pacific Groundwater Group 2000) provides an analysis of many wetlands and other ecological issues of interest to the Corps, Ecology, and other agencies reviewing the JARPA for the Port of Seattle Master Plan Update Improvements. Conclusions the report makes on some key issues of concern to federal and state agencies are highlighted below, with relevant pages of the report attached. 1. Page 30 The study finds that the wetland delineations completed within the project area are conservative in estimating the extent of wetlands, meaning that the marginal areas were more likely to be called wetlands rather than uplands. 2. Page 41 Limiting habitat characteristics of the creeks are identified in Section 3.4.6.5. Note that the Port's mitigation plan focuses on enhancing these habitat conditions by: • Management of construction activities to mitigate for potential increases of fine sediment in streambed pools. • Addition of woody debris to create more complex in-stream structure, and • Enhancement of riparian vegetation along Miller Creek throughout the acquisition area. 3. Page 42 The overall significance of Des Moines, Walker, and Miller Creeks-3.4.7 to regional fisheries is small. Note that the mitigation proposed by the Port focuses on assuring conditions in the creeks are enhanced so local declines in fish do not occur. 4. Page 55 The report identifies the potential of 1.68 acres of secondary, indirect impact from embankment (especially to the Wetland 18 and Wetland 36 complex). Further analysis of this potential impact is the subject…

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PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]