EXH0114017893

.... for the period July 1, 2000 through June 30, 2001 September 2001 , ___: ; Rs-:-.rterJ AR 017893 _f c EXECUTIVE SUMMARY This Annual StormwaterMonitoringReport has been prepared pursuantto Special Condition S2.E of the NPDES permit for the Port of Sea_e's Seattle- Tacoma InternationalAirport (STIA). This report covers requiredstormwater sampling for the 14 ouffallslisted in permit conditionS2.B. The Port tooka total of 61 grab and 59 compositestormwater samples from a total of 22 stormevents in the past year, bringingthe 7-year totals to over400 samples and 168 storm events. The Port compliedwith all samplingand reportingrequirements .inthe NPDES permit. In summary, STIA stormwaterquality,especiallyairfield runoff,continues to have constituentconcentrationslower than those reported in comparableregional studies. Results continue to demonstrate that most constituentconcentrationsin STIA airfield outfalldischargesare much lower than those fromthe landside ouffalls. This differenceis most likelydue to highervehicular use in the landside areas and a higher degree of biofiltrationpresent in the airfieldsubbasins. Nonetheless, overallSTIA resultsare generally lower than resultsfrom other studiesfor roadwaysand commercial areas. The Port is continuingto investigatemanagement options for the zinc in runoff associatedwith two cargo buildingswith galvanized metal rooftops. This work is a follow up to whole effluenttoxicity(WET) testingfindings reportedin 2000. Recent work has focused on stormwatertreatment alternatives where several media have been tested in controlledlaboratoryexperiments, including commerciallyavailable CSF® deciduousleaf compost produced by Stormwater Management (PortlandOR) and speciallymodified soybean hullsdeveloped by the U.S. Department of Agriculture.Boththe leaf compost and thesoybean hulls are agriculturalwaste productsthat can be recycled as water-treatmentmedia. AR 017894 " Current Year BOD5 PrincipalSTIAStorrnwalerOutfalls 160 -" 140 t._JA_.-z_…

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 [...]