EXH0309020475

Subject: Comments on stormwater, hydrology, and hydraulics aspects of proposed 3rd runwayandrelateddevelopmentactionsatSeatde-TacomaInternationalAirport, CorpsReference No. 1996-4-02325. Northwest Hydraulic Consultants has been retained on behalf of the Airport Communities Coalition to provide technical reviews of stormwater, hydrology, and hydraulics elements of proposed development actions at SeaTac airport. Our comments on the 2q'ovember 1999 version of the project storrnwater management plan and related environmental documents were submitted to Ecology and the Corps in a series of three letters dated 11/24/99, 5/3/2000, and 7/31/2000. Our comments on the August 2000 version of the stormwater management plan were submitted to Ecology (but not the Corps) in a series of four letters dated 9/7/2000, 9/21/2000, 9125/2000, and 9/27/2000. The purpose of this letter is to record our review comments on the December 2000 version of the documents listed below. • "Comprehensive Stormwater Management Plan; Seattle-Tacoma International ALrportMaster Plan Update Improvements" dated December 2000 by Parametrix_ Inc. Also reviewed were the separately-bound (as Volumes 2 through 4) Comprehensive Stormwater Management Plan Appendices A through Z dated December 2000. (SMP) * "Natural Resource Mitigation Plan; Seattle-Tacoma International Airport; Master Plan Update Improvements" dated December 2000 by Parametrix, Inc, Also reviewed were the separately-bound Natural Resource Mitigation Plan Appendices A-E Design Drawings dated December 2000. (NKM_) I_.,.,r NO.'90c7 - I M. Green RIVER ENGINEERING I HYDRAULIC MODEL TESTING t HYDRAULIC ANALYSIS AND DESIGN 1 COA}=n_ ,r._l_ | _lcl; i'tlN_ HYDROLOGY / SEDIMENTATION ENGINEERING / NUMERICAL MODELING I APPLIED RESEAR_R I FORENSIC ENGINEERING AR 020475 • • ,=° Tebmary 15,…

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 [...]