EXH0738026637

Results of whole effluent toxiciW,testing and source tracing indicate that metal roofing materials contribute to elevated zinc concentrations in a major U.S. airport's stormwater discharges By Scott A. Tobiason and Linda R. J. Logan In 1994, the Port of Seattle (the Port), which owns and operates Seattle-Tacoma International Airport (STIA), secured a national pollutant discharge elimination system (NPDES) permit for stormwater and industrial wastewater treatment plant (WWTP) discharges. The industrial WWTP, unique to STIA, captures fuel spills from aircraft service areas and discharges dissolved-air floatation-treated effluent to Puget Sound. Overall, the industrial waste system drains about 370 ac (148 ha) or 28% of the airport, primarily the "airside" gate areas where aircraft undergo routine servicing, fueling, and deicing. _ A system of 14 stormwater subbasins, drainage piping, and associated outfalls drain the remaining 963 ac (385 ha) or 72% of the airport, including the runways and taxiways. Four of these subbasins drain 17% of the total storm-drain system (SDS) to Miller Creek, eight subbasins drain the remainder to Des Moines Creek, and two minor subbasins combine with offsite areas draining to the Green River. All these receiving waters are important spawning and rearing streams for Coho salmon and cutthroat trout. To comply with intensive stormwater-monitoring requirements of the NPDES permit, the Port implemented a stormwater-management program. that has generated more than 500 gab and composite samples with hundreds of results for a variety of stormwater constituents. In March 1998, the Port's NPDES permit was revised to require, among other items,…

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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 [...]