EXH1107041729

Figure 1 Conceptual design of Des Momes Creek flow augmentation.................................. 5 Table 1-1 Waterfights on Port of Seattle property......................................................................3 Table 3-1 Monitoringplan............................................................................................................ .8.. Table 4-1 Implementationschedule............................................................................................ 10 Seattle-Tacoma Imernational Airport -ii- Port of Seattle Des Momes Creek Flow Augmentation Plan August 18, 1998 AR 041731 1.0 INTRODUCTION" 1.1 PURI_SE AND BACKGROUND ThisDes Moines CreekFlow Augmentation Plan describes the desiga, operation, and monitoring of a streamilow augmentation facility that will be constructed on Port of Seattle (Port) pmpervy at the Tyee Valley Golf Course near Seattle-Tacoma Imernauonal Airport. The flow augmentationfacilitywillsupplyupto400gpm (0.88cfs)ofwatertoDes MoinesCreekfrom an existing groundwaterwell on Port property. Inu-oducuonof the cool well wa_erto the stream should improve wazer quality and aquatic habitat during critical low flow periods in mid- to late b'UI11mer. The plan forproviding flow augmentation to Des Moines Cr_k was originally proposed by King County as part of the 1997 Des Momes Creek Basin Plan to mitigate existing or potential cumulative impacts on Des Moines Creek baseflows. The Port subsequently incorporated the plan m Section 2.1 of Amended Wetland Mitigation Plan and Supporting Documents, July 15, 1998, which was prepared in support of the Section 401 Water Quality Certification for the proposed Master Plan projects. On July 20, 1998 the State of Washington Department of Ecology (Ecology) issued Order 96-4-02325: Port of Seattle Master Plan Improvements (the Order) requiring the Port to issue an operations plan to Ecology describing how the flow augmentation will be implemented. This Plan was prepared m response to that Order. King County is…

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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 [...]