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EXH AR023766: Revised Flow Augmentation Implementation Plan Des Moines Creek

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Sea-Tac Airport
Third Runway
PCHB
Box 10

In August 2000, the Port of Seattle submitted a revised implementation plan to the Washington Department of Ecology for a flow augmentation facility on Des Moines Creek, near Seattle-Tacoma International Airport. The plan outlines two potential water sources — a Port-owned well used to irrigate the Tyce Valley Golf Course, or water purchased from Seattle Public Utilities — along with details on pipeline construction, dechlorination treatment options, and pump configurations. Construction of the facility was scheduled to begin in June 2002, with the well preferred as the lower-cost option pending resolution of water rights issues.

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Letter dated August 18, 2000 from Keith R. Smith, Water Resources Manager, Port Of Seattle, to Tom Luster, Department of Ecology (Ecology), transmitting the Revised Implementation Plan for the Des Moines Creek Flow Augmentation Facility. The plan discusses two water sources: a Port-owned well used to irrigate Tyce Valley Golf Course (water right change application pending with Ecology’s Water Resources program) and Seattle Public Utilities (SPU) via existing Port connections. Covers dechlorination treatment using sodium thiosulfate, pipeline construction (6-8 inch diameter, approximately 4,500 feet) along runway 34R and taxiway A, pump configurations (submersible vs. turbine, 75-Hp variable-speed), SR509 extension encroachment issues, construction scheduled for June 2002, and cost estimates. Filed in PCHB Third Runway EIS administrative record as AR023766.

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