EXH0502022970

Ms. Gail Terzi and Mr. Jonathan Freedman tmrmoN_Zt_r_a. SCIENCES US Army Corps of Engineers Regulatory Section, Seattle District PO Box 3755 Seattle, WA 98124-2255 RE: Review of Wetlands Impacts Resulting from Construction of Temporary Interchange at SR509 and S. 176 thStreet. Dear Ms. Terzi, The Airport Communities Coalition (ACC) requested that I review the SR509 temporary interchange project associated with the construction of the third runway at Seattle Tacoma International Airport. The project is located in Burien, and construction will occur in areas to the east and west adjacent to SR509 and north orS. 176thstreet. am an environmental scientist and a professional wetland scientist (SWS certification number 001067). A package describing my background and experience is attached to this report. This letter presents my comments resulting from the review and specifically addresses the potential for impacts to Wetland 43 from the construction of the temporary interchange. My conclusion, detailed in this report, is that construction of the temporary interchange will result in periodic discharges to Wetland 43 from of sediment-laden stormwater from both expected and unexpected stormwater events. The disturbance to the wetland resulting from these events will have significant environmental consequences to wetland water quality, aquatic habitat and may be sufficient to alter the vegetation community further affecting wetland functions. reviewed the project plans (signed February 24, 2000) and hydraulic report (April 12, 2000) prepared by HNTB Corporation, and the wetlands reports prepared by Parametrix, Inc. including the Wetland Delineation Report, Wetland Functional Assessment and Impact Analysis, Wetlands Re-Evaluation…

Open full document

Upcoming Events

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 [...]