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EXH AR021155: Water Resources Consulting LLC to Ecology — Comments STIA Stormwater Master Plan

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Sea-Tac Airport
Third Runway
PCHB
Box 09

A water resources consultant hired by the Airport Communities Coalition reviewed Sea-Tac Airport's August 2000 Stormwater Master Plan and found it seriously deficient in protecting local water quality. The review concludes that existing pollution controls at the airport are not working, that stormwater discharges regularly violate Washington State Water Quality Standards, and that the Plan's proposed measures fail to provide reasonable assurance that those standards will be met in the future. Key concerns include the diversion of polluted runoff away from local creeks, inadequate handling of metal roof runoff, and the lack of meaningful mass-balance accounting for long-lived pollutants.

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Letter dated September 19, 2000 from Peter Willing, Ph.D. of Water Resources Consulting LLC to Ray Hellwig, Regional Director, Washington State Department of Ecology Northwest Regional Office, submitted on behalf of the Airport Communities Coalition (ACC). Reviews the August 2000 Preliminary Comprehensive Stormwater Management Plan for Seattle-Tacoma International Airport (STIA) prepared by Parametrix Inc. Critiques include: diversion of stormwater to industrial waste system bypassing Des Moines Creek and Miller Creek basins; NPDES Permit No. WA-002465-I violations; 303(d) impaired water listings; zinc, copper, and lead exceedances from metal roofs in subbasin SDN1; biofiltration swales and filter strips inadequacy; dissolved oxygen and BOD problems; failure to meet Washington State Water Quality Standards; and contravention of Governor Locke’s certification regarding drainage divide. Concludes the Plan fails to constitute reasonable assurance that water quality standards will be met. References King County Surface Water Design Manual, Des Moines Creek Basin Plan, and NPDES Discharge Monitoring Reports.

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